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9612 Records
Parameters:
| Scientific Name | Common Name | Inverted Common Name | Species Code | Population Code | Current Distribution | Family | First Listed | Species Group | Lead Region | Federal Listing Status | Regions of Occurrence | U.S. or Foreign Listed | Vertebrate/ Invertebrate/Plant | Where Listed |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abies fraseri | Fraser fir | Fir, Fraser | R00B | P01 | NC, VA; | Pinaceae | NA | Conifers and Cycads | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Abies guatemalensis | Guatemalan Fir (=pinabete) | Fir, Guatemalan (=pinabete) | R003 | P01 | Mexico, Honduras, Guatemala, El Salvador | Pinaceae | Dec 10, 1979 | Conifers and Cycads | Foreign | Threatened | NA | Foreign | P | Wherever found |
| Ablautus schlingeri | Oso Flaco robber fly | Robber fly, Oso Flaco | I0O3 | I01 | CA; | Asilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Abronia alpina | Ramshaw Meadows sand-verbena | Sand-verbena, Ramshaw Meadows | Q009 | P01 | CA; | Nyctaginaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Abronia ammophila | Yellowstone Sand Verbena | Verbena Yellowstone Sand | Q3LO | P01 | Nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Abronia ammophila var. | No common name | No common name | Q3LN | P01 | Nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Abronia ammphila | [Unnamed] sand-verbena | Sand-verbena, [unnamed] | Q3AM | P01 | WY; | Nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Abronia bigelovii | [Unnamed] sand-verbena | Sand-verbena, [unnamed] | Q00A | P01 | NM; | Nyctaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Abronia macrocarpa | Large-fruited sand-verbena | Sand-verbena, large-fruited | Q24E | P01 | TX; U.S.A. (TX) | Nyctaginaceae | Sep 28, 1988 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Abronia turbinata | [Unnamed] sand-verbena | Sand-verbena, [unnamed] | Q24F | P01 | NV; | Nyctaginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Abronia umbellata acutalata | Rose-purple sand-verbena | Sand-verbena, rose-purple | Q2WY | P01 | WA; Possibly extinct,last observed in 1940 | Nyctaginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Abronia umbellata breviflora | Pink sand-verbena | Sand-verbena, pink | Q2WZ | P01 | CA, OR; | Nyctaginaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Abutilon eremitopetalum | No common name | No common name | Q1SJ | P01 | HI; U.S.A. (HI) | Malvaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Abutilon hulseanum | Terciopelo | Terciopelo | Q00B | P01 | PR, VI; | Malvaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Abutilon menziesii | Ko`oloa`ula | Ko`oloa`ula | Q1SK | P01 | HI; U.S.A. (HI) | Malvaceae | Sep 26, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Abutilon parishii | No common name | No common name | Q2YI | P01 | AZ; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Abutilon sandwicense | No common name | No common name | Q1SL | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Abutilon virginianum | No common name | No common name | Q24G | P01 | PR, VI; Possibly extinct,not observed since 1913. | Malvaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Acacia koaia | Koai`e | Koai`e | Q00D | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Acaena exigua | Liliwai | Liliwai | Q1SM | P01 | HI; U.S.A. (HI) | Rosaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Acalyptera susanae | [Unnamed] lace bug | Lace bug, [unnamed] | I0MM | I01 | AR; | Tingidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Acanthocyclops columbiensis | Copepod | Copepod | K04S | I01 | Copepoda | NA | Crustaceans | NA | Not Listed | NA | I | Wherever found | ||
| Acanthometropus pecatonica | Pecatonica River mayfly | Mayfly, Pecatonica River | I09X | I01 | IL, WI; | Siphlonuridae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Acanthomintha ilicifolia | San Diego thornmint | Thornmint, San Diego | Q00E | P01 | CA; U.S.A. (CA), Mexico | Lamiaceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US/Foreign | P | Wherever found |
| Acanthomintha obovata obovata | San Benito thornmint | Thornmint, San Benito | Q3AN | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Acanthomintha obovata ssp. duttonii | San Mateo thornmint | Thornmint, San Mateo | Q24H | P01 | CA; U.S.A. (CA) | Lamiaceae | Sep 18, 1985 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Acanthorutilus handlirschi | Cicek (minnow) | Cicek (minnow) | E00N | V01 | Turkey | Cyprinidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| acarospora clauzadeana | No common name | No common name | U00C | P01 | acarosporaceae | NA | Lichens | 2 | Not Listed | NA | US | P | Wherever found | |
| Accipiter cooperii | Cooper's hawk | hawk, Cooper's | B0DT | V01 | CA; | Accipitridae | NA | Birds | 8 | Not Listed | 8 | US | V | Wherever found |
| Accipiter fasciatus natalis | Christmas Island goshawk | Goshawk, Christmas Island | B01N | V01 | Indian Ocean-Christmas Island | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Accipiter francesii pusillus | Anjouan Island sparrowhawk | Sparrowhawk, Anjouan Island | B03A | V01 | Indian Ocean-Comoros Islands | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Accipiter gentilis | Northern goshawk | Goshawk, northern | B095 | V01 | AK, AL, AR, AZ, CA, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NM, NV, NY, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY; | Accipitridae | NA | Birds | 2 | Not Listed | 1, 2, 3, 4, 5, 6, 7, 8 | US/Foreign | V | Wherever found |
| Accipiter gentilis laingi | Queen Charlotte goshawk | Goshawk, Queen Charlotte | B0AE | V01 | AK; | Accipitridae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Accipiter gentilis laingi | Queen Charlotte goshawk | Goshawk, Queen Charlotte | B0AE | V02 | British Columbia, Canada | Accipitridae | Aug 31, 2012 | Birds | Foreign | Threatened | NA | Foreign | V | British Columbia, Canada |
| Accipiter striatus | Sharp shinned hawk | Hawk, Sharp shinned | B0G3 | V01 | CA; | Accipitridae | NA | Birds | 8 | Not Listed | 8 | US | V | Wherever found |
| Accipiter striatus venator | Puerto Rican sharp-shinned hawk | Hawk, Puerto Rican sharp-shinned | B06Z | V01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Accipitridae | Sep 09, 1994 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Acer grandidentatum sinuosum | [Unnamed] maple | Maple, [unnamed] | Q00F | P01 | TX; | Aceraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Achatinella spp. | Oahu tree snails | Snails, Oahu tree | G01J | I01 | HI; U.S.A. (HI) | Achatinellidae | Feb 12, 1981 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Achnatherum contractum | No common name | No common name | Q2V0 | P01 | CO, WY; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Achnatherum curvifolium | No common name | No common name | Q2JE | P01 | NM, TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Achnatherum swallenii | No common name | No common name | Q2V1 | P01 | ID, WY; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Achyranthes atollensis | No common name | No common name | Q2RN | P01 | HI; Believed to be extinct | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Achyranthes mutica | No common name | No common name | Q00G | P01 | HI; U.S.A. (HI) | Amaranthaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Achyranthes splendens splendens | No common name | No common name | Q00H | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Achyranthes splendens var. rotundata | Round-leaved chaff-flower | Chaff-flower, round-leaved | Q24I | P01 | HI; U.S.A. (HI) | Amaranthaceae | Mar 26, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Acinonyx jubatus | Cheetah | Cheetah | A00S | V01 | Africa to India; Entire | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Acipenser baerii | Siberian sturgeon | sturgeon, Siberian | E0BU | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser brevirostrum | Shortnose sturgeon | Sturgeon, shortnose | E00B | V01 | GA, NC, PA, SC; U.S.A. and Canada (Atlantic Coast) | Acipenseridae | Mar 11, 1967 | Fishes | NMFS | Endangered | 4, 5 | US | V | Wherever found |
| Acipenser dabryanus | Yangtze Sturgeon | Sturgeon, Yangtze | E0BV | V01 | China | Acipenseridae | NA | Fishes | Foreign | Proposed Endangered | NA | Foreign | V | Wherever found |
| Acipenser fulvescens | Lake sturgeon | Sturgeon, lake | E04X | V01 | AL, AR, GA, IA, IL, IN, KS, KY, LA, MI, MN, MO, MS, NE, NY, OH, PA, SD, TN, VT, WI, WV; | Acipenseridae | NA | Fishes | 3 | Not Listed | 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Acipenser gueldenstaedtii | Russian Sturgeon | Sturgeon, Russian | E0BW | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser medirostris | green sturgeon | sturgeon, green | E09K | V01 | CA; U.S.A. (CA) | Acipenseridae | Jun 06, 2006 | Fishes | NMFS | Threatened | 8 | US/Foreign | V | Southern DPS - See 50 CFR 223.102 |
| Acipenser mikadoi | Sakhalin sturgeon | sturgeon, Sakhalin | E0D5 | V01 | Acipenseridae | Sep 04, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Acipenser naccarii | Adriatic sturgeon | sturgeon, Adriatic | E0CH | V01 | Acipenseridae | Sep 04, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Acipenser nudiventris | Ship Sturgeon | Sturgeon, Ship | E0BX | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser oxyrinchus (=oxyrhynchus) desotoi | Atlantic sturgeon (Gulf subspecies) | Sturgeon (Gulf subspecies), Atlantic | E04W | V01 | AL, FL, LA, MS; U.S.A. (MS, LA, GA, FL, AL) | Acipenseridae | Sep 30, 1991 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | Sturgeon, Atlantic | E0A7 | V02 | Acipenseridae | Feb 06, 2012 | Fishes | NMFS | Threatened | NA | US | V | Gulf of Maine DPS - See 50 CFR 223.102 | |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | Sturgeon, Atlantic | E0A7 | V03 | Acipenseridae | Feb 06, 2012 | Fishes | NMFS | Endangered | NA | US | V | New York Bight DPS - See 50 CFR 224.101 | |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | Sturgeon, Atlantic | E0A7 | V04 | Acipenseridae | Feb 06, 2012 | Fishes | NMFS | Endangered | NA | US | V | Chesapeake Bay DPS - See 50 CFR 224.101 | |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | Sturgeon, Atlantic | E0A7 | V05 | GA, NC; | Acipenseridae | Feb 06, 2012 | Fishes | NMFS | Endangered | 4 | US | V | Carolina DPS - See 50 CFR 224.101 |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | Sturgeon, Atlantic | E0A7 | V06 | Acipenseridae | Feb 06, 2012 | Fishes | NMFS | Endangered | NA | US | V | South Atlantic DPS - See 50 CFR 224.101 | |
| Acipenser persicus | Persian Sturgeon | Sturgeon, Persian | E0BY | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser schrenckii | Amur Sturgeon | Sturgeon, Amur | E0BZ | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser sinensis | Chinese sturgeon | sturgeon, Chinese | E0CI | V01 | Acipenseridae | Sep 04, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Acipenser stellatus | Stellate Sturgeon | Sturgeon, Stellate | E0C3 | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Acipenser sturio | European sturgeon | sturgeon, European | E0CJ | V01 | Acipenseridae | Sep 04, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Acipenser transmontanus | White sturgeon | Sturgeon, white | E087 | V01 | ID, MT; Canada (B.C.); U.S.A. (WA, OR, MT, ID, CA, AK) Canada (B.C.) | Acipenseridae | Sep 06, 1994 | Fishes | 1 | Endangered | 1, 6 | US/Foreign | V | U.S.A. (ID, MT), Canada (B.C.), (Kootenai R. system) |
| Acleisanthes crassifolia | Texas trumpets | Trumpets, Texas | Q00I | P01 | TX; | Nyctaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Acmispon dendroideus var. traskiae (=Lotus d. ssp. traskiae) | San Clemente Island lotus (=broom) | Lotus, San Clemente Island | Q1YO | P01 | CA; U.S.A. (CA) | Fabaceae | Sep 12, 1977 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Acneus beeri | Beer's false water penny | False water penny, Beer's | I06W | I01 | OR; | Eubriidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Acneus burnelli | Burnell's false water penny | False water penny, Burnell's | I06X | I01 | OR; | Eubriidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Aconitum noveboracense | Northern wild monkshood | Monkshood, northern wild | Q1SN | P01 | IA, NY, OH, WI; U.S.A. (WI, OH, NY, IA) | Ranunculaceae | May 27, 1978 | Flowering Plants | 3 | Threatened | 3, 5 | US | P | Wherever found |
| Acrocephalus caffer longirostris | Moorea Polynesian warbler | Warbler, Moorea Polynesian | B0D8 | V01 | Sylviidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Acrocephalus familiaris kingi | Nihoa millerbird (old world warbler) | Millerbird, Nihoa (old world warbler) | B00G | V01 | HI; U.S.A. (HI) | Muscicapidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Acrocephalus luscinia | Nightingale reed warbler (old world warbler) | Warbler, nightingale reed (old world warbler) | B043 | V01 | GU, MP; West Pacific Ocean-U.S.A. (Guam, Alamagan, Saipan) | Sylviidae | Jun 02, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Acrocephalus percernis aquilonis | Eiao Marquesas reed-Warbler | Warbler, Eiao Marquesas reed- | B0D7 | V01 | French Polynesian Marquesas Archipelago (Eiao Island) | Sylviidae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Acrolophitus pulchellus | Idaho pointheaded grasshopper | Grasshopper, Idaho pointheaded | I077 | I01 | ID; | Acrididae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Acroloxus coloradensis | Rocky Mountain capshell | Capshell, Rocky Mountain | G05V | I01 | CO, MT; | Acroloxidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Acroneuria kosztarabi | Virginia stone | stone, Virginia | I0X2 | I01 | KY, VA; | Perlidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Acronicta albarufa | Barrens Dagger Moth | Dagger moth, Barrens | I05R | I01 | AR, CO, CT, DE, GA, MA, MO, NC, NJ, NM, NY, OH, PA; | Noctuidae | NA | Insects | 5 | Not Listed | 2, 3, 4, 5, 6 | US/Foreign | I | Wherever found |
| Acropora cervicornis | Staghorn coral | Coral, staghorn | P000 | I01 | FL; U.S.A. (FL, PR, VI, Navassa); and wider Caribbean-Belize, Colombia, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, Panama, Venezuela, and all the islands of the West Indies | Acroporidae | Jun 08, 2006 | Corals | NMFS | Threatened | 4 | US/Foreign | I | Wherever found |
| Acropora globiceps | No common name | No common name | P00O | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora jacquelinae | No common name | No common name | P00B | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora lokani | No common name | No common name | P00C | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora palmata | Elkhorn coral | Coral, elkhorn | P001 | I01 | FL; U.S.A. (FL, PR, VI, Navassa); and wider Caribbean-Belize, Colombia, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, Panama, Venezuela, and all the islands of the West Indies | Acroporidae | Jun 08, 2006 | Corals | NMFS | Threatened | 4 | US/Foreign | I | Wherever found |
| Acropora pharaonis | No common name | No common name | P00U | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora retusa | No common name | No common name | P00W | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora rudis | No common name | No common name | P00D | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora speciosa | No common name | No common name | P00X | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Acropora tenella | No common name | No common name | P00Z | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Actinemys marmorata | Western pond Turtle | Turtle, western pond | C06B | V01 | Emydidae | NA | Reptiles | 9 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Actinemys marmorata marmorata | Northwestern pond turtle | Turtle, northwestern pond | C04U | V01 | WA; | Emydidae | NA | Reptiles | 1 | Not Listed | 1 | US/Foreign | V | Wherever found |
| Actinemys marmorata pallida | Southwestern pond turtle | Turtle, southwestern pond | C04V | V01 | CA; | Emydidae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Actinostachys pennula | Curly-grass fern | Fern, curly-grass | S00J | P01 | FL; | Schizaeaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Addax nasomaculatus | Addax | Addax | A0G3 | V01 | Entire; North Africa | Bovidae | Sep 02, 2005 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Adella oplerella | Opler's longhorn moth | Longhorn moth, Opler's | I0NS | I01 | CA; | Incurvariidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Adelocosa anops | Kauai cave wolf or pe'e pe'e maka 'ole spider | Spider, Kauai cave wolf or pe'e pe'e maka 'ole | J000 | I01 | HI; Entire | Lycosidae | Jan 14, 2000 | Arachnids | 1 | Endangered | 1 | US | I | Wherever found |
| Adenophorus periens | Pendant kihi fern | Fern, pendant kihi | S00M | P01 | HI; U.S.A. (HI) | Polypodiaceae | Nov 10, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Adhemarius blanchardorum | Blanchards' sphinx moth | Sphinx moth, Blanchards' | I0M1 | I01 | TX; | Sphingidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Adiantum vivesii | No common name | No common name | S01O | P01 | PR; U.S.A. (PR) | Adiantaceae | Jun 09, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Adolphia californica | California adolphia | adolphia, California | Q3J4 | P01 | Rhamnaceae | NA | Flowering Plants | 8 | Not Listed | NA | US | P | Wherever found | |
| aechmophorus occidentalis | Western grebe | grebe, Western | B0EA | V01 | podocopedidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Aegialia concinna | Ciervo aegialian scarab | Scarab, Ciervo aegialian | I0CP | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Aegialia crescenta | Crescent Dune aegialian scarab | Scarab, Crescent Dune aegialian | I0CQ | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Aegialia hardyi | Hardy's aegialian scarab | Scarab, Hardy's aegialian | I0CR | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Aegialia magnifica | Large aegialian scarab | Scarab, large aegialian | I0CS | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Aepyceros melampus petersi | Black-faced impala | Impala, black-faced | A01E | V01 | Wherever found | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Aerodramus vanikorensis bartschi | Mariana gray swiftlet | Swiftlet, Mariana gray | B091 | V01 | GU, MP; | Apodidae | Aug 27, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Aerva sericea | No common name | No common name | Q00J | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Aeschynomene pratensis | Meadow joint-vetch | joint-vetch, Meadow | Q3P4 | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Aeschynomene virginica | Sensitive joint-vetch | Joint-vetch, Sensitive | Q24J | P01 | DE, MD, NC, NJ, VA; U.S.A. (VA, PA, NC, NJ, MD, DE) | Fabaceae | May 20, 1992 | Flowering Plants | 5 | Threatened | 4, 5 | US | P | Wherever found |
| afilia species | notodontid moth | moth, notodontid | I0UC | I01 | notodontidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Aflexia rubranura | Redveined prairie leafhopper | Leafhopper, redveined prairie | I082 | I01 | IL, WI; | Cicadellidae | NA | Insects | 3 | Not Listed | 3 | US/Foreign | I | Wherever found |
| Agabus rumppi | Death Valley agabus diving beetle | Beetle, Death Valley agabus diving | I02A | I01 | CA, NV; | Dytiscidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Agalinis acuta | Sandplain gerardia | Gerardia, sandplain | Q24K | P01 | CT, MA, MD, NY, RI; The current range for this species extends northward from Maryland to Massachusetts, specifically within each of these five states (Maryland, New York, Connecticut, Rhode Island, and Massachusetts). ; U.S.A. (RI, NY, MD, MA, CT) | Scrophulariaceae | Sep 07, 1988 | Flowering Plants | 5 | Endangered | 5 | US | P | Wherever found |
| Agalinis auriculata | Auriculate false-foxglove | False-foxglove, auriculate | Q3G2 | P01 | AR, IL, IN, KS, MD, MI, MN, MO, MS, OH, OK, PA, SC, TN, TX, VA, WI, WV; | Scrophulariaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4, 5, 6 | US | P | Wherever found |
| Agalinis navasotensis | Navasota False Foxglove | False Foxglove, Navasota | Q3PQ | P01 | Orobanchaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Agalinis purpurea carteri | No common name | No common name | Q00K | P01 | FL; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Agalinis setacea | [Unnamed] false foxglove | False foxglove, [unnamed] | Q00L | P01 | FL; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| agapema galbina | Tamaulipan Agapema | Agapema, Tamaulipan | I0U9 | I01 | TX; | saturniidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Agapetus artesus | Artesian agapetus caddisfly | Caddisfly, artesian agapetus | I039 | I01 | MO; | Glossosomatidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Agapetus denningi | Denning's agapetus caddisfly | Caddisfly, Denning's agapetus | I03M | I01 | OR; | Glossosomatidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agapetus jocassee | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0MO | I01 | NC, SC; | Glossosomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Agapetus medicus | Arkansas agapetus caddisfly | Caddisfly, Arkansas agapetus | I03A | I01 | AR; | Glossosomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Agarodes alabamensis | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0MP | I01 | AL; | Sericostomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Agarodes logani | Logan's Agarodes caddisfly | caddisfly, Logan's Agarodes | I0WS | I01 | FL; | Sericostomatidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Agarodes stannardi | Stannard's agarodes caddisfly | Caddisfly, Stannard's agarodes | I0J2 | I01 | MS, TN; | Sericostomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Agarodes ziczac | Zigzag blackwater caddisfly | Caddisfly, zigzag blackwater | I04I | I01 | FL; | Sericostomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Agastache cusickii | No common name | No common name | Q00M | P01 | ID, NV, OR; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Agastache parvifolia | Small-leaved agastache | Agastache, small-leaved | Q00N | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| agathon arizonicus | No common name | No common name | I0UH | I01 | blephariceridae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Agave arizonica | Arizona agave | Agave, Arizona | Q24L | P01 | AZ; | Agavaceae | May 18, 1984 | Flowering Plants | 2 | Original Data in Error - Not a listable entity | 2 | US | P | Entire |
| Agave eggersiana | No common name | No common name | Q00O | P01 | VI; | Agavaceae | Oct 09, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Agave glomeruliflora | Chisos agave | Agave, Chisos | Q00P | P01 | TX; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Agave mckelveyana | No common name | No common name | Q00Q | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Agave murpheyi | No common name | No common name | Q2YF | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Agave parviflora parviflora | Santa Cruz striped agave | Agave, Santa Cruz striped | Q24M | P01 | AZ; Mexico (Sonora) | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Agave schottii treleasei | No common name | No common name | Q00R | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Agave shawii | Shaw's agave | Agave, Shaw's | Q3AO | P01 | CA; | Agavaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agave sp. | Sp. nov. ined. (Tonto Basin) agave | Agave, sp. nov. ined. (Tonto Basin) | Q2YJ | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Agave toumeyana bella | No common name | No common name | Q00S | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Agave utahensis eborispina | Ivory-spined agave | Agave, ivory-spined | Q00T | P01 | CA, NV; | Agavaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agave utahensis kaibabensis | No common name | No common name | Q00U | P01 | AZ; | Agavaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Agave utahensis nevadensis | Clark Mountains agave | Agave, Clark Mountains | Q00V | P01 | CA, NV; | Agavaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agelaius tricolor | Tricolored blackbird | Blackbird, tricolored | B06P | V01 | CA, NV, OR; | Icteridae | NA | Birds | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US/Foreign | V | Wherever found |
| Agelaius xanthomus | Yellow-shouldered blackbird | Blackbird, yellow-shouldered | B05T | V01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Icteridae | Dec 12, 1976 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Agelastes meleagrides | White-breasted guineafowl | Guineafowl, white-breasted | B09S | V01 | West Africa | Phasianidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Ageratina luciae-brauniae | No common name | No common name | Q2TO | P01 | KY, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ageratina shastensis | Shasta eupatorium | Eupatorium, Shasta | Q0U4 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agonum belleri | Beller's ground beetle | Ground beetle, Beller's | I01M | I01 | OR, WA; | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agosia chrysogaster | Longfin dace | Dace, longfin | E08S | V01 | AZ, NM; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Agrilus harenus | Algodones croton jewel beetle | Jewel beetle, Algodones croton | I0TP | I01 | Buprestidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Agrimonia incisa | Incised groovebur | Groovebur, incised | Q00W | P01 | AL, FL, GA, MS, SC, TX; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Agrostis blasdalei blasdalei | Blasdale's bentgrass | Bentgrass, Blasdale's | Q24N | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agrostis blasdalei marinensis | Marin bentgrass | Bentgrass, Marin | Q00Y | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agrostis clivicola clivicola | Coastal bluff bentgrass | Bentgrass, coastal bluff | Q24O | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agrostis clivicola punta-reyesensis | Point Reyes bentgrass | Bentgrass, Point Reyes | Q00Z | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agrostis hendersonii | Henderson's bentgrass | Bentgrass, Henderson's | Q011 | P01 | CA, OR; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Agrostis howellii | Howell's bentgrass | Bentgrass, Howell's | Q010 | P01 | OR; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Agrostis microphylla | Awned bentgrass | Bentgrass, awned | Q00X | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Agrostis rossiae | Ross bentgrass | Bentgrass, Ross | Q012 | P01 | WY; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Agrotis buchholzi | Buchholz' dart moth | Dart moth, Buchholz' | I0KX | I01 | DE, NC, NJ; | Noctuidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Agrotis cremata | Cremata agrotis noctuid moth | Noctuid moth, Cremata agrotis | I0Q0 | I01 | HI; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis crinigera | 'Poko' noctuid moth | Moth, 'Poko' noctuid | I0AK | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis fasciata | Midway agrotis noctuid moth | Moth, Midway agrotis noctuid | I0B8 | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis kerri | Kerr's agrotis noctuid moth | Moth, Kerr's agrotis noctuid | I0AX | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis laysanensis | Laysan agrotis noctuid moth | Moth, Laysan agrotis noctuid | I0B0 | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis melanoneura | Black-veined agrotis noctuid moth | Noctuid moth, black-veined agrotis | I0Q1 | I01 | HI; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis microreas | Microreas agrotis noctuid moth | Noctuid moth, microreas agrotis | I0Q2 | I01 | HI; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis potophila | Potophila agrotis noctuid moth | Noctuid moth, potophila agrotis | I0Q3 | I01 | HI; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Agrotis procellaris | Procellaris agrotis noctuid moth | Moth, Procellaris agrotis noctuid | I0BD | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| agylla septentrionalis | No common name | No common name | I0UF | I01 | arctiidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Ailuropoda melanoleuca | Giant panda | Panda, giant | A0A5 | V01 | Wherever found | Ursidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Aimophila aestivalis | Bachman's sparrow | Sparrow, Bachman's | B07F | V01 | FL, VA; | Emberizidae | NA | Birds | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Aimophila botterii texana | Texas Botteri's sparrow | Sparrow, Texas Botteri's | B07J | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Aimophila cassinii | Cassin's Sparrow | Sparrow, Cassin's | B0K2 | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Aimophila ruficeps | Rufous-crowned Sparrow | Sparrow, Rufous-crowned | B0MX | V01 | Emberizidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Aimophila ruficeps canescens | Southern California rufous-crowned sparrow | Sparrow, Southern California rufous-crowned | B09E | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Aimophila ruficeps rupicola | Yuma rufous-crowned sparrow | Sparrow, Yuma rufous-crowned | B07M | V01 | AZ; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US | V | Wherever found |
| Aipysurus fuscus | Dusky sea snake | snake, Dusky sea | C081 | V01 | Elapidae | Nov 06, 2015 | Reptiles | NMFS | Endangered | NA | Foreign | V | Entire | |
| Akialoa stejnegeri | Kauai akialoa (honeycreeper) | akialoa, Kauai (honeycreeper) | B000 | V01 | HI; ; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Alabameubria starki | Stark's false water penny | False water penny, Stark's | I06Y | I01 | AL; | Eubriidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Alasmidonta arcula | Altamaha arc-mussel | Arc-mussel, Altamaha | F018 | I01 | GA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Alasmidonta atropurpurea | Cumberland elktoe | Elktoe, Cumberland | F01K | I01 | KY, TN; U.S.A. (TN, KY) | Unionidae | Jan 10, 1997 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Alasmidonta heterodon | Dwarf wedgemussel | Wedgemussel, dwarf | F029 | I01 | CT, MA, MD, NC, NH, NJ, NY, PA, VA, VT; Canada (N.B.); U.S.A. (VT, VA, PA, NY, NJ, NH, NC, MD, MA, DE, DC, CT), Canada (N.B.) | Unionidae | Mar 14, 1990 | Clams | 5 | Endangered | 4, 5 | US/Foreign | I | Wherever found |
| Alasmidonta marginata | [Unnamed] elktoe | Elktoe, [unnamed] | F03Q | I01 | AL, IN, KS, MD, MI, MN, MO, ND, NY, OH, OK, PA, SD, TN, VA, WI, WV; | Unionidae | NA | Clams | 6 | Not Listed | 2, 3, 4, 5, 6 | US/Foreign | I | Wherever found |
| Alasmidonta mccordi | Coosa elktoe | Elktoe, Coosa | F01H | I01 | AL; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Alasmidonta raveneliana | Appalachian elktoe | Elktoe, Appalachian | F01J | I01 | NC, TN; U.S.A. (TN, NC) | Unionidae | Nov 23, 1994 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Alasmidonta robusta | Carolina elktoe | Elktoe, Carolina | F01I | I01 | NC; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Alasmidonta triangulata | Southern elktoe | elktoe, Southern | F04N | I01 | FL, GA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Alasmidonta varicosa | Brook floater | Floater, brook | F03D | I01 | GA, NC, SC, VA; | Unionidae | NA | Clams | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US/Foreign | I | Wherever found |
| Alasmidonta wrightiana | Florida arc-mussel | Arc-mussel, Florida | F019 | I01 | FL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Alauda razae | Raso lark | Lark, Raso | B09T | V01 | Atlantic Ocean Cape Verde (Raso Island); Cape Verde (Raso Island) | Alaudidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| albiorix anophthalmus | No common name | No common name | J03B | I01 | ideoroncidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Alcelaphus buselaphus swaynei | Swayne's hartebeest | Hartebeest, Swayne's | A018 | V01 | Wherever found | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Alcelaphus buselaphus tora | Tora hartebeest | Hartebeest, Tora | A07P | V01 | Wherever found | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Alces alces andersoni | Northwestern Moose | Moose, Northwestern | A0L0 | V01 | MI, MN, ND, WI; | Cervidae | NA | Mammals | 3 | Under Review in the Candidate or Petition Process | 3, 6 | US | V | Wherever found |
| Alectryon macrococcus | Mahoe | Mahoe | Q1SO | P01 | HI; U.S.A. (HI) | Sapindaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Aletes filifolius | No common name | No common name | Q013 | P01 | NM, TX; | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Aletes humilis | No common name | No common name | Q24P | P01 | CO, WY; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Alethe choloensis | Thyolo alethe | Alethe, Thyolo | B09K | V01 | Mozambique, Malawi | Muscicapidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| alexicles aspersa | No common name | No common name | I0UY | I01 | arctiidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Algamorda newcombiana | Newcomb's littorine snail | Snail, Newcomb's littorine | G00U | I01 | CA, OR, WA; | Littorinidae | NA | Snails | 1 | Not Listed | 1, 8 | US | I | Wherever found |
| Aliciella caespitosa | Wonderland Alice-flower | Alice-flower, wonderland | Q0W6 | P01 | UT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aliciella formosa | Beautiful gilia | Gilia, beautiful | Q2TU | P01 | NM; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Alle alle | Dovekie | Dovekie | B0B4 | V01 | Alcidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Alligator mississippiensis | American alligator | Alligator, American | C000 | V01 | FL, NC, OK; Southeastern U.S.A. | Alligatoridae | Mar 11, 1967 | Reptiles | 4 | Similarity of Appearance to a Threatened Taxon | 2, 4 | US | V | Wherever found |
| Alligator sinensis | Chinese alligator | Alligator, Chinese | C00W | V01 | China | Alligatoridae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Allionia cristata | No common name | No common name | Q24Q | P01 | AZ; | Nyctaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Allium aaseae | Aase's onion | Onion, Aase's | Q014 | P01 | ID; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium constrictum | [Unnamed] onion | Onion, [unnamed] | Q24R | P01 | WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium dictuon | Blue Mountain onion | Onion, Blue Mountain | Q015 | P01 | WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium gooddingii | Goodding's onion | Onion, Goodding's | Q016 | P01 | AZ, NM; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| allium haematochiton | Yucaipa onion | onion, Yucaipa | Q3JU | P01 | liliaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Allium hickmanii | Hickman's onion | Onion, Hickman's | Q017 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium hoffmanii | Beegum onion | Onion, Beegum | Q018 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium jepsonii | Jepson's onion | Onion, Jepson's | Q2YK | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium madidum | [Unnamed] onion | Onion, [unnamed] | Q24S | P01 | ID, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium munzii | Munz's onion | Onion, Munz's | Q2X0 | P01 | CA; U.S.A. (CA) | Liliaceae | Oct 13, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Allium oxyphilum | [Unnamed] onion | Onion, [unnamed] | Q2X1 | P01 | VA, WV; | Liliaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Allium passeyi | Passey's onion | Onion, Passey's | Q019 | P01 | UT; | Liliaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Allium perdulce sperryi | [Unnamed] onion | Onion, [unnamed] | Q24T | P01 | TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Allium pleianthum | Howell's onion | Onion, Howell's | Q3HX | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium robinsonii | [Unnamed] onion | Onion, [unnamed] | Q01A | P01 | OR, WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium scilloides | [Unnamed] onion | Onion, [unnamed] | Q24U | P01 | WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium shevockii | Spanish needle onion | Onion, Spanish needle | Q3AP | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium speculae | [Unnamed] onion | Onion, [unnamed] | Q2X2 | P01 | AL, GA; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Allium tolmiei persimile | [Unnamed] onion | Onion, [unnamed] | Q01B | P01 | ID; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Allium tribracteatum | Siskiyou onion | Onion, Siskiyou | Q3AQ | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium tuolumnense | Rawhide Hill onion | Onion, Rawhide Hill | Q24V | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allium yosemitense | Yosemite onion | Onion, Yosemite | Q01C | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Allocapnia brooksi | Sevier snowfly | snowfly, Sevier | I0X3 | I01 | TN; | Capniidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Allocapnia cunninghami | Karst snowfly | snowfly, Karst | I0X5 | I01 | KY, TN; | Capniidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Allocapnia fumosa | Smokies snowfly | snowfly, Smokies | I0X4 | I01 | NC, TN, VA; | Capniidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Allocrangonyx hubrichti | Central Missouri cave amphipod | Amphipod, Central Missouri cave | K00J | I01 | MO; | Gammaridae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Allocrangonyx pellucidus | Oklahoma cave amphipod | Amphipod, Oklahoma cave | K014 | I01 | OK; | Gammaridae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Allomyia hector | No common name | No common name | I0V1 | I01 | Apataniidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Alloperla natchez | Natchez stonefly | Stonefly, Natchez | I0M5 | I01 | MS; | Chloroperlidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Alloperla roberti | Robert's alloperlan stonefly | Stonefly, Robert's alloperlan | I0EF | I01 | IL; Believed to be extinct | Chloroperlidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Allowissadula holosericea | No common name | No common name | Q01D | P01 | TX; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Alnus maritima | Seaside alder | Alder, seaside | Q01E | P01 | DE, GA, MD, OK; | Betulaceae | NA | Flowering Plants | 5 | Under Review in the Candidate or Petition Process | 2, 4, 5 | US | P | Wherever found |
| Alopecurus aequalis var. sonomensis | Sonoma alopecurus | Alopecurus, Sonoma | Q01F | P01 | CA; U.S.A. (CA) | Poaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Alouatta palliata | Mantled howler monkey | Monkey, mantled howler | A05T | V01 | Mexico to South America | Cebidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Alouatta pigra | Black howler monkey | Monkey, black howler | A06S | V01 | Mexico,Guatemala,Belize | Cebidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Alphitonia ponderosa | Kauila | Kauila | Q1SP | P01 | HI; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Alsophila brooksii | No common name | No common name | S00Y | P01 | PR, VI; | Cyatheaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Alsophis sancticrucis | St. Croix racer | Racer, St. Croix | C03Q | V01 | VI; Believed to be extinct | Colubridae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Amaranthus brownii | No common name | No common name | Q01G | P01 | HI; U.S.A. (HI) | Amaranthaceae | Aug 21, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Amaranthus pumilus | Seabeach amaranth | Amaranth, seabeach | Q2MZ | P01 | DE, MD, NC, NJ, NY, SC, VA; U.S.A. (VA, SC, RI, NY, NJ, NC, MD, MA, DE) | Amaranthaceae | Apr 07, 1993 | Flowering Plants | 4 | Threatened | 4, 5 | US | P | Wherever found |
| Amazilia luciae | Honduran emerald hummingbird | hummingbird, Honduran emerald | B0GG | V01 | Honduras | Trochilidae | Aug 28, 2015 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona arausiaca | Red-necked parrot | Parrot, red-necked | B05V | V01 | West Indies-Dominica | Psittacidae | Jul 27, 1979 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona brasiliensis | Red-tailed parrot | Parrot, red-tailed | B06H | V01 | Brazil | Psittacidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona collaria | Yellow-billed parrot | Parrot, yellow-billed | B0GR | V01 | Psittacidae | Apr 11, 2013 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found | |
| Amazona guildingii | St Vincent parrot | Parrot, St Vincent | B02K | V01 | West Indies-St. Vincent | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona imperialis | Imperial parrot | Parrot, imperial | B02G | V01 | West Indies-Dominica | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona leucocephala | Bahaman or Cuban parrot | Parrot, Bahaman or Cuban | B05C | V01 | West Indies-Cuba, Bahamas, Caymans | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona pretrei pretrei | Red-spectacled parrot | Parrot, red-spectacled | B05E | V01 | Brazil, Argentina | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona rhodocorytha | Red-browed parrot | Parrot, red-browed | B02I | V01 | Brazil | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona versicolor | St. Lucia parrot | Parrot, St. Lucia | B02J | V01 | West Indies-St. Lucia | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona vinacea | Vinaceous-breasted parrot | Parrot, vinaceous-breasted | B05F | V01 | Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Amazona viridigenalis | Red-crowned parrot | Parrot, red-crowned | B0GO | V01 | TX; | Psittacidae | May 04, 2019 | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Amazona vittata | Puerto Rican parrot | Parrot, Puerto Rican | B00L | V01 | PR; Canovanas, Ceiba, Fajardo, Juncos, Las Piedras, Luquillo, Naguabo, Rio Grande, Utuado, Adjuntas, and Arecibo; U.S.A. (PR) | Psittacidae | Mar 11, 1967 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Amblema neislerii | Fat threeridge (mussel) | Threeridge, fat (mussel) | F032 | I01 | FL, GA; Florida panhandle Apalachicola and Chipola; main channels of small to large rivers; slow to moderate currents; various substrates; U.S.A. (GA, FL) | Unionidae | Mar 16, 1998 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Amblyderus werneri | Great Sand Dunes Anthicid Beetle | Beetle | I0V2 | I01 | Anthicidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Amblyopsis rosae | Ozark cavefish | Cavefish, Ozark | E02J | V01 | AR, MO, OK; U.S.A. (OK, MO, AR) | Amblyopsidae | Nov 01, 1984 | Fishes | 4 | Threatened | 2, 3, 4 | US | V | Wherever found |
| Amblyopsis spelaea | Northern cavefish | Cavefish, northern | E02I | V01 | IN, KY; | Amblyopsidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 3, 4 | US | V | Wherever found |
| Amblyscirtes linda | Linda's Roadside-skipper | Roadside-skipper, Linda's | I0WK | I01 | AR, IL, KY, OK, TN; | Hesperiidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 2, 3, 4 | US | I | Wherever found |
| Ambrosia cheiranthifolia | South Texas ambrosia | Ambrosia, south Texas | Q1SS | P01 | TX; U.S.A. (TX) | Asteraceae | Aug 24, 1994 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Ambrosia linearis | [Unnamed] ambrosia | Ambrosia, [unnamed] | Q2N0 | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ambrosia pumila | San Diego ambrosia | Ambrosia, San Diego | Q01H | P01 | CA; U.S.A. (CA), Mexico | Asteraceae | Jul 02, 2002 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Ambrysus amargosus | Ash Meadows naucorid | Naucorid, Ash Meadows | I023 | I01 | NV; U.S.A. (NV) | Naucoridae | May 20, 1985 | Insects | 8 | Threatened | 8 | US | I | Wherever found |
| Ambrysus funebris | Nevares Spring naucorid bug (=Furnace Creek) | Naucorid bug (=Furnace Creek), Nevares Spring | I0T8 | I01 | CA; | Naucoridae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Ambystoma barbouri | Streamside salamander | salamander, Streamside | D04N | V01 | IN, KY, OH, TN, WV; | Ambystomatidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | V | Wherever found |
| Ambystoma bishopi | Reticulated flatwoods salamander | salamander, Reticulated flatwoods | D042 | V01 | FL, GA; U.S.A. (GA, FL) | Ambystomatidae | Feb 10, 2009 | Amphibians | 4 | Endangered | 4 | US | V | Wherever found |
| Ambystoma californiense | California tiger Salamander | Salamander, California tiger | D01T | V01 | CA; U.S.A. (CA - Santa Barbara) | Ambystomatidae | Jan 19, 2000 | Amphibians | 8 | Endangered | 8 | US | V | U.S.A. (CA - Santa Barbara County) |
| Ambystoma californiense | California tiger Salamander | Salamander, California tiger | D01T | V02 | CA; U.S.A. (CA - Sonoma County) | Ambystomatidae | Jul 22, 2002 | Amphibians | 8 | Endangered | 8 | US | V | U.S.A. (CA - Sonoma County) |
| Ambystoma californiense | California tiger Salamander | Salamander, California tiger | D01T | V03 | CA; U.S.A. (CA) | Ambystomatidae | Aug 04, 2004 | Amphibians | 8 | Threatened | 8 | US | V | U.S.A. (CA - Central California) |
| Ambystoma cingulatum | Frosted Flatwoods salamander | Salamander, frosted flatwoods | D013 | V01 | FL, GA, SC; U.S.A. (SC, GA, FL) | Ambystomatidae | Apr 01, 1999 | Amphibians | 4 | Threatened | 4 | US | V | Wherever found |
| ambystoma gracile | Northwestern salamander | salamander, Northwestern | D03F | V01 | ambystomatidae | NA | Amphibians | 7 | Not Listed | NA | US | V | Wherever found | |
| Ambystoma macrodactylum croceum | Santa Cruz long-toed salamander | Salamander, Santa Cruz long-toed | D000 | V01 | CA; U.S.A. (CA) | Ambystomatidae | Mar 11, 1967 | Amphibians | 8 | Endangered | 8 | US | V | Wherever found |
| Ambystoma tigrinum stebbinsi | Sonora tiger Salamander | Salamander, Sonora tiger | D01H | V01 | AZ; U.S.A. (AZ), Mexico | Ambystomatidae | Jan 06, 1997 | Amphibians | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Ameiva polops | St. Croix ground lizard | Lizard, St. Croix ground | C01P | V01 | VI; U.S.A. (VI) | Teiidae | Jul 05, 1977 | Reptiles | 4 | Endangered | 4 | US | V | Wherever found |
| Ameiva wetmorei | Blue-tailed ground lizard | Lizard, blue-tailed ground | C03H | V01 | PR, VI; | Teiidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Amelanchier nantucketensis | [Unnamed] service-berry | Service-berry, [unnamed] | Q2YM | P01 | MA, NY; | Rosaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Ameletus edmundsi | No common name | No common name | I0V3 | I01 | Ameletidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Ameletus falsus | False ameletus mayfly | Mayfly, false ameletus | I09T | I01 | AZ; | Siphlonuridae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| amergoniscus centalis | No common name | No common name | K05R | I01 | trichoniscidae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| amergoniscus gipsocolus | No common name | No common name | K05S | I01 | trichoniscidae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Ammocrypta pellucida | Eastern sand darter | Darter, eastern sand | E015 | V01 | IL, IN, KY, MI, NY, OH, PA, VT, WV; | Percidae | NA | Fishes | 5 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Ammodorcas clarkei | Clark's gazelle | Gazelle, Clark's | A011 | V01 | Entire | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ammodramus bairdii | Baird's sparrow | Sparrow, Baird's | B09B | V01 | CO, ID, KS, MN, MO, MT, ND, NE, NM, OK, SD, TX, WY; | Emberizidae | NA | Birds | 6 | Not Listed | 1, 2, 3, 6 | US/Foreign | V | Wherever found |
| Ammodramus henslowii | Henslow's sparrow | Sparrow, Henslow's | B09D | V01 | AL, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, NE, NH, OH, PA, SC, SD, TN, TX, VA, VT, WI, WV; | Emberizidae | NA | Birds | 3 | Not Listed | 2, 3, 4, 5, 6 | US | V | Wherever found |
| Ammodramus henslowii houstonensis | Texas Henslow's sparrow | Sparrow, Texas Henslow's | B07K | V01 | TX; Believed to be extinct | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US | V | Wherever found |
| Ammodramus maritimus juncicola | Wakulla seaside sparrow | Sparrow, Wakulla seaside | B07L | V01 | FL; | Emberizidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Ammodramus maritimus macgillivraii | MacGillivray's Seaside sparrow | sparrow, MacGillivray's Seaside | B0NI | V01 | FL, GA, SC; | Emberizidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Ammodramus maritimus mirabilis | Cape Sable seaside sparrow | Sparrow, Cape Sable seaside | B00Q | V01 | FL; U.S.A. (FL) | Emberizidae | Mar 11, 1967 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Ammodramus maritimus nigrescens | Dusky seaside sparrow | Sparrow, dusky seaside | B00R | V01 | Believed to be extinct | Emberizidae | Mar 11, 1967 | Birds | 4 | Extinction | NA | US | V | Wherever found |
| Ammodramus maritimus pelonotus | Smyrna seaside sparrow | Sparrow, Smyrna seaside | B07I | V01 | FL; Believed to be extinct | Emberizidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Ammodramus savannarum | Grasshopper Sparrow | Sparrow, Grasshopper | B0G0 | V01 | Emberizidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Ammodramus savannarum floridanus | Florida grasshopper sparrow | Sparrow, Florida grasshopper | B07G | V01 | FL; U.S.A. (FL) | Emberizidae | Jul 31, 1986 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Ammodramus savannarum ssp. perpallidus | Grasshopper sparrow | Sparrow, Grasshopper | B0DU | V01 | CA; | Emberizidae | NA | Birds | 8 | Not Listed | 8 | US | V | Wherever found |
| Ammonitella yatesii | Yates' tight coin | Tight coin, Yates' | G00E | I01 | CA; | Ammonitellidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Ammopelmatus kelsoensis | Kelso jerusalem cricket | Jerusalem cricket, Kelso | I07H | I01 | CA; | Stenopelmatidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ammopelmatus muwu | Point Conception jerusalem cricket | Jerusalem cricket, Point Conception | I07I | I01 | CA; | Stenopelmatidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ammospermophilus nelsoni | Nelson's antelope ground squirrel | Squirrel, Nelson's antelope ground | A09P | V01 | CA; | Sciuridae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Ammospiza caudacuta | Saltmarsh Sparrow | Sparrow, Saltmarsh | B0MY | V01 | SC; | Passerellidae | NA | Birds | 9 | Not Listed | 4 | US | V | Wherever found |
| Amnicola sp | Washington duskysnail | Duskysnail, Washington | G0FX | I01 | Hydrobiidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Amoreuxia gonzalezii | Saiya | Saiya | Q3AR | P01 | TX; Mexico (Sonora) | Cochlospermaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Amoreuxia wrightii | Wright's yellowshow | Yellowshow, Wright's | Q01I | P01 | TX; Curacao,Mexico,South America | Cochlospermaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amorpha canescens | No common name | No common name | Q01J | P01 | MO; | Fabaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Amorpha crenulata | Crenulate lead-plant | Lead-plant, Crenulate | Q2RI | P01 | FL; U.S.A. (FL) | Fabaceae | Jul 18, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Amorpha georgiana confusa | Carolina lead-plant | Lead-plant, Carolina | Q2YN | P01 | NC; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Amorpha georgiana georgiana | Georgia lead-plant | Lead-plant, Georgia | Q2YO | P01 | GA, NC, SC; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Amorpha ouachitensis | [Unnamed] false indigo | False indigo, [unnamed] | Q01K | P01 | AR, OK; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Amorpha roemeriana | Texas amorpha | Amorpha, Texas | Q01L | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amphianthus pusillus | Little amphianthus | Amphianthus, little | Q1ST | P01 | AL, GA, SC; U.S.A. (SC, GA, AL) | Scrophulariaceae | Feb 05, 1988 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Amphigyra alabamensis | Shoal sprite | Shoal sprite | G08I | I01 | AL; | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Amphinemura mockfordi | Tennessee forestfly | forestfly, Tennessee | I0X6 | I01 | AL, TN; | Nemouridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Amphisbaena bakeri | Baker's worm lizard | Lizard, Baker's worm | C027 | V01 | PR, VI; | Amphisbaenidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Amphispiza belli | Bell's Sparrow | Sparrow, Bell's | B0HE | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Amphispiza belli belli | Bell's sage sparrow | Sparrow, Bell's sage | B09C | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Amphispiza belli clementeae | San Clemente sage sparrow | Sparrow, San Clemente sage | B05S | V01 | CA; U.S.A. (CA) | Emberizidae | Sep 12, 1977 | Birds | 8 | Threatened | 8 | US | V | Wherever found |
| Amphiuma pholeter | One-toed Amphiuma | Amphiuma, One-toed | D03Q | V01 | AL, FL, GA, MS; | Amphiumidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Amsinckia carinata | Malheur Valley fiddleneck | Fiddleneck, Malheur Valley | Q24X | P01 | OR; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Amsinckia grandiflora | Large-flowered fiddleneck | Fiddleneck, large-flowered | Q1SU | P01 | CA; U.S.A. (CA) | Boraginaceae | May 08, 1985 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Amsinckia vernicosa | Green fiddleneck | Fiddleneck, green | Q24Y | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Amsinckia vernicosa furcata | Forked fiddleneck | Fiddleneck, forked | Q01M | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Amsonia fugatei | No common name | No common name | Q3AS | P01 | NM; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amsonia glaberrima | Smooth blue-star | Blue-star, smooth | Q01N | P01 | LA, TX; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Amsonia grandiflora | [Unnamed] blue-star | Blue-star, [unnamed] | Q2N1 | P01 | AZ; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Amsonia kearneyana | Kearney's blue-star | Blue-star, Kearney's | Q24Z | P01 | AZ; U.S.A. (AZ) | Apocynaceae | Jan 19, 1989 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Amsonia ludoviciana | Louisiana blue-star | Blue-star, Louisiana | Q2X4 | P01 | GA, LA, MS; | Apocynaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Amsonia palmeri | [Unnamed] blue-star | Blue-star, [unnamed] | Q01O | P01 | AZ; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amsonia peeblesii | [Unnamed] blue-star | Blue-star, [unnamed] | Q01P | P01 | AZ; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amsonia repens | [Unnamed] blue-star | Blue-star, [unnamed] | Q01Q | P01 | TX; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Amsonia tabernaemontana gattingeri | No common name | No common name | Q250 | P01 | TN; | Apocynaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Amsonia tharpii | Tharp blue-star | Blue-star, Tharp | Q01R | P01 | NM, TX; | Apocynaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Amytornis goyderi | Eyrean grasswren (flycatcher) | Grasswren, Eyrean (flycatcher) | B01P | V01 | Australia | Tyrannidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| anacolia menziesii | Menzies' anacolia moss | moss, Menzies' anacolia | U007 | P01 | bartamiaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Anacroneuria wipukupa | Redrock stonefly | Stonefly, redrock | I0W2 | I01 | AZ; | Perlidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Anacropora spinosa | No common name | No common name | P00E | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Anaea troglodyta floridalis | Florida leafwing Butterfly | Butterfly, Florida leafwing | I087 | I01 | FL; | Nymphalidae | Sep 11, 2014 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Anairetes alpinus | Ash-breasted tit-tyrant | Tit-tyrant, ash-breasted | B0BF | V01 | Bolivia, Peru | Tyrannidae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Anas aucklandica nesiotis | Campbell Island flightless teal | Teal, Campbell Island flightless | B05O | V01 | New Zealand - Campbell Island | Anatidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Anas bahamensis | White-cheeked pintail | Pintail, white-cheeked | B0C9 | V01 | Anatidae | NA | Birds | 9 | Not Listed | NA | US | V | Puerto Rico | |
| Anas bahamensis bahamensis | Lesser white-cheeked pintail | Pintail, lesser white-cheeked | B077 | V01 | PR, VI; West Indies,South America | Anatidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Anas diazi | Mexican duck | Duck, Mexican | B007 | V01 | AZ, NM, TX; | Anatidae | Mar 11, 1967 | Birds | 2 | Original Data in Error - Taxonomic Revision | 2 | US | V | U.S. only |
| Anas laysanensis | Laysan duck | Duck, Laysan | B006 | V01 | HI; U.S.A. (HI) | Anatidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Anas oustaleti | Mariana mallard | Mallard, Mariana | B059 | V01 | GU, MP; Possibly extinct | Anatidae | Dec 08, 1977 | Birds | 1 | Extinction | 1 | US | V | Wherever found |
| Anas wyvilliana | Hawaiian (=koloa) Duck | Duck, Hawaiian (=koloa) | B005 | V01 | HI; U.S.A. (HI) | Anatidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Anaxyrus boreas boreas | Boreal toad | toad, Boreal | D026 | V01 | CO, WY; | Bufonidae | NA | Amphibians | 6 | Under Review in the Candidate or Petition Process | 6 | US | V | Southern Rocky Mountain DPS |
| Anaxyrus boreas boreas | Boreal toad | toad, Boreal | D026 | V02 | Bufonidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Eastern population | |
| Anaxyrus californicus | Arroyo (=arroyo southwestern) toad | Toad, arroyo (=arroyo southwestern) | D020 | V01 | CA; U.S.A. (CA), Mexico | Bufonidae | Dec 16, 1994 | Amphibians | 8 | Endangered | 8 | US/Foreign | V | Wherever found |
| Anaxyrus canorus | Yosemite toad | toad, Yosemite | D02K | V01 | CA; | Bufonidae | Jun 30, 2014 | Amphibians | 8 | Threatened | 8 | US | V | Wherever found |
| Anchotefflus gracilis | Gracile anchotefflus ground beetle | Ground beetle, gracile anchotefflus | I0P9 | I01 | HI; | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Andrias davidianus (=davidianus d.) | Chinese giant salamander | Salamander, Chinese giant | D007 | V01 | Western China | Cryptobranchidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Andrias japonicus (=davidianus j.) | Japanese giant salamander | Salamander, Japanese giant | D008 | V01 | Japan | Cryptobranchidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Andropogon arctatus | [Unnamed] beard grass | Beard grass, [unnamed] | Q01T | P01 | AL, FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Aneides aeneus | Green salamander | Salamander, green | D015 | V01 | GA, NC, SC; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Aneides hardii | Sacramento mountain salamander | Salamander, Sacramento mountain | D01Z | V01 | NM; | Plethodontidae | NA | Amphibians | 2 | Not Listed | 2 | US | V | Wherever found |
| Anemone edwardsiana edwardsiana | [Unnamed] anemone | Anemone, [unnamed] | Q01V | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Anemone edwardsiana petraea | Edge Falls anemone | Anemone, Edge Falls | Q01U | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Anemone minima | [Unnamed] anemone | Anemone, [unnamed] | Q251 | P01 | VA, WV; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Anemone oregana felix | [Unnamed] anemone | Anemone, [unnamed] | Q01W | P01 | OR, WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Angelica callii | Call's angelica | Angelica, Call's | Q01X | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Angelica scabrida | No common name | No common name | Q01Y | P01 | NV; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Angelica wheeleri | No common name | No common name | Q01Z | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Anguilla rostrata | American eel | Eel, American | E0AG | V01 | AL, AR, CT, DE, FL, GA, IA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, PA, RI, SC, TN, TX, VA, VT; | Anguillidae | NA | Fishes | 4 | Not Listed | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Anguispira picta | Painted snake coiled forest snail | Snail, painted snake coiled forest | G00W | I01 | TN; U.S.A. (TN) | Stylommataphora | Aug 02, 1978 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Anheteromyia biceps | Muscular sponge | Sponge, muscular | O002 | I01 | MI; | Spongillidae | NA | Sponges | 3 | Not Listed | 3 | US | I | Wherever found |
| Anisocarpus scabridus | Scabrid railardella | Railardella, scabrid | Q2HC | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Anniella pulchra nigra | Black legless lizard | Lizard, black legless | C03G | V01 | CA; | Anniellidae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Anniella pulchra pulchra | Silvery legless lizard | Lizard, silvery legless | C05Z | V01 | CA; | Anniellidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Anoda abutiloides | False indian-mallow | False indian-mallow | Q252 | P01 | AZ; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Anodonta californiensis | California floater | Floater, California | F034 | I01 | AZ, CA, ID, NV, OR, UT, WA; | Unionidae | NA | Clams | 2 | Not Listed | 1, 2, 6, 8 | US/Foreign | I | Wherever found |
| Anodonta heardi | Apalachicola floater | floater, Apalachicola | F04O | I01 | AL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Anodontoides denigrata | Cumberland papershell | Papershell, Cumberland | F03U | I01 | KY, TN; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Anodontoides radiatus | Rayed creekshell | creekshell, Rayed | F04P | I01 | AL, FL, GA, LA, MS; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Anodorhynchus glaucus | Glaucous macaw | Macaw, glaucous | B056 | V01 | Uruguay, Paraguay, Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Anodorhynchus hyacinthinus | Hyacinth macaw | Macaw, hyacinth | B0GL | V01 | Psittacidae | Sep 12, 2018 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found | |
| Anodorhynchus leari | Indigo macaw | Macaw, indigo | B057 | V01 | Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Anolis occultus | Puerto Rican pygmy anole | Anole, Puerto Rican pygmy | C039 | V01 | PR, VI; | Iguanidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Anolis roosevelti | Culebra Island giant anole | Anole, Culebra Island giant | C01O | V01 | PR; U.S.A. (PR-Culebra Island) | Iguanidae | Aug 22, 1977 | Reptiles | 4 | Endangered | 4 | US | V | Wherever found |
| Anomala exigua | Exiguous anomalan scarab | Scarab, exiguous anomalan | I0CT | I01 | FL; Possibly extinct,not reported since 1965 | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Anomala eximia | Archbold anomalan scarab | Scarab, Archbold anomalan | I0CU | I01 | FL; Possibly extinct,not reported since 1965 | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Anomala hardyorum | Hardy's dune beetle | Beetle, Hardy's dune | I0TQ | I01 | Scarabaeidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Anomala tibialis | Tibial scarab | Scarab, tibial | I0CV | I01 | TX; Possibly extinct,not reported since 1965 | Scarabaeidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Anomis vulpicolor | Red anomis noctuid moth | Noctuid moth, red anomis | I0Q4 | I01 | HI; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Anoxypristis cuspidata | Narrow sawfish | sawfish, Narrow | E0D1 | V01 | Pristidae | Jan 12, 2015 | Fishes | NMFS | Endangered | NA | US | V | Wherever found | |
| Anser albifrons elgasi | Tule white-fronted goose | Goose, Tule white-fronted | B069 | V01 | AK, CA, OR; | Anatidae | Mar 11, 1967 | Birds | 7 | Not Listed | 1, 7, 8 | US | V | Wherever found |
| Antecaridina lauensis | Anchialine pool shrimp | Shrimp, anchialine pool | K038 | I01 | HI; | Atyidae | NA | Crustaceans | 1 | Not Listed | 1 | US/Foreign | I | Wherever found |
| Antechinomys laniger | Eastern jerboa marsupial | Marsupial, eastern jerboa | A034 | V01 | Entire | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Antechinus apicalis | Dibbler | Dibbler | A032 | V01 | Australia | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Antennaria arcuata | Meadow pussytoes | Pussytoes, meadow | Q020 | P01 | ID, NV, WY; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Antennaria aromatica | No common name | No common name | Q2X5 | P01 | MT, OR, WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 1, 6 | US | P | Wherever found |
| Antennaria soliceps | No common name | No common name | Q021 | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Antennaria suffrutescens | Evergreen everlasting | Everlasting, evergreen | Q022 | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Anthicus antiochensis | Antioch Dunes anthicid | Anthicid, Antioch Dunes | I025 | I01 | CA; | Anthicidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Anthicus sacramento | Sacramento anthicid | Anthicid, Sacramento | I01F | I01 | CA; | Anthicidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Anthocharis cethura catalina | Catalina orange tip butterfly | Butterfly, Catalina orange tip | I007 | I01 | CA; | Pieridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Anthus spragueii | Sprague's pipit | Pipit, Sprague's | B0GD | V01 | AR, AZ, KS, LA, MN, MS, MT, ND, NM, OK, SD, TX; ; The species historical range includes Arizona, Arkansas, Colorado, Kansas, Louisiana, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming as well as parts of Canada and Mexico. The current range no longer includes Wyoming or Minnesota. | Motacillidae | NA | Birds | 6 | Not Listed | 2, 3, 4, 6 | US | V | Wherever found |
| Antigone canadensis ssp. pratensis | Florida sandhill crane | crane, Florida sandhill | B0NM | V01 | FL, GA; | Gruidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Antilocapra americana peninsularis | Peninsular pronghorn | Pronghorn, peninsular | A04M | V01 | Mexico (Baja California) | Antilocapridae | Oct 28, 1975 | Mammals | Foreign | Endangered | NA | Foreign | V | Mexico (Baja California) |
| Antilocapra americana sonoriensis | Sonoran pronghorn | Pronghorn, Sonoran | A009 | V01 | AZ; U.S.A. (AZ), Mexico | Antilocapridae | Mar 11, 1967 | Mammals | 2 | Endangered | 2 | US/Foreign | V | Wherever found, except where listed as an experimental population |
| Antilocapra americana sonoriensis | Sonoran pronghorn | Pronghorn, Sonoran | A009 | V02 | AZ; ; In Arizona, an area north of Interstate 8 and south of Interstate 10, bounded by the Colorado River on the west and Interstate 10 on the east; and an area south of Interstate 8, bounded by Highway 85 on the west, Interstates 10 and 19 on the east, and the U.S.-Mexico border on the south | Antilocapridae | May 05, 2011 | Mammals | 2 | Experimental Population, Non-Essential | 2 | US/Foreign | V | In Arizona, an area north of Interstate 8 and south of Interstate 10, bounded by the Colorado River on the west and Interstate 10 on the east; and an area south of Interstate 8, bounded by Highway 85 on the west, Interstates 10 and 19 on the east, and the U.S.-Mexico border on the south |
| Antirhea portoricensis | Quina | Quina | Q024 | P01 | PR, VI; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Antrobia culveri | Tumbling Creek cavesnail | Cavesnail, Tumbling Creek | G04I | I01 | MO; U.S.A. (MO) | Hydrobiidae | Aug 14, 2002 | Snails | 3 | Endangered | 3 | US | I | Wherever found |
| Antrolana lira | Madison Cave isopod | Isopod, Madison Cave | K008 | I01 | VA, WV; U.S.A. (VA) | Cirolanidae | Oct 04, 1982 | Crustaceans | 5 | Threatened | 5 | US | I | Wherever found |
| Antrorbis breweri | Manitou cavesnail | cavesnail, Manitou | G08R | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| antrozous pallidus | Pallid bat | bat, Pallid | A0IM | V01 | vespertilionidae | NA | Mammals | 2 | Not Listed | NA | US | V | Wherever found | |
| anulocaulis leiosolenus | Sticky ringstem | ringstem, Sticky | Q3JD | P01 | nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Aonyx congicus (=congica) microdon | Cameroon clawless otter | Otter, Cameroon clawless | A02W | V01 | Wherever found | Mustelidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Apacheria chiricahuensis | No common name | No common name | Q026 | P01 | AZ, NM; | Crossosomataceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Apamea smythi | Smyth's apamea moth | Apamea moth, Smyth's | I0IG | I01 | IL, VA; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 3 | Not Listed | 3, 5 | US | I | Wherever found |
| Apatalestes rossi | Ross's apatalestes tabanid fly | Tabanid fly, Ross's apatalestes | I0EL | I01 | CA; | Tabanidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Apatania tavala | Cascades apatanian caddisfly | Caddisfly, Cascades apatanian | I03F | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Aphanisma blitoides | Aphanisma | Aphanisma | Q253 | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Aphaostracon asthenes | Blue Spring hydrobe | Hydrobe, Blue Spring | G01X | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphaostracon chalarogyrus | Freemouth Hydrobe snail | snail, Freemouth Hydrobe | G0G6 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphaostracon monas | Wekiwa hydrobe | Hydrobe, Wekiwa | G01Y | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphaostracon pycnum | Dense hydrobe | Hydrobe, dense | G01Z | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphaostracon theiocrenetum | Clifton Spring Hydrobe snail | snail, Clifton Spring Hydrobe | G0G7 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphaostracon xynoelictum | Fenney Spring hydrobe | Hydrobe, Fenney Spring | G020 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphelocoma coerulescens | Florida scrub-jay | scrub-jay, Florida | B082 | V01 | FL; treeless or nearly treeless xeric vegetative communities throughout peninsular Florida; U.S.A. (FL) | Corvidae | Jun 03, 1987 | Birds | 4 | Threatened | 4 | US | V | Wherever found |
| Aphelocoma coerulescens cana | Eagle Mountain scrub jay | Jay, Eagle Mountain scrub | B096 | V01 | CA; | Corvidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Aphelocoma insularis | Island Scrub-Jay | Scrub-Jay, Island | B0MA | V01 | Corvidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Aphodius fordi | Ford's aphodius scarab | Scarab, Ford's aphodius | I0CW | I01 | GA; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Aphodius sp. | Sand Mountain aphodius scarab | Scarab, Sand Mountain aphodius | I0LP | I01 | NV; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Sand Mt. |
| Aphodius sp. | Big Dune aphodius scarab | Scarab, Big Dune aphodius | I0LN | I01 | NV; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Big Dune |
| Aphodius sp. | Crescent Dune aphodius scarab | Scarab, Crescent Dune aphodius | I0LO | I01 | NV; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Crescent Dune |
| Aphodius troglodytes | Aphodius tortoise commensal scarab | Scarab, aphodius tortoise commensal | I0CX | I01 | FL, SC; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| aphrastochthonius | (Aphrastochthonius) pseudoscorpion | pseudoscorpion, (Aphrastochthonius) | J01P | I01 | Chthonidae | NA | Arachnids | 6 | Not Listed | NA | US | I | Wherever found | |
| Aphrastochthonius grubbsi | Grubbs' cave pseudoscorpion | Pseudoscorpion, Grubbs' cave | J00D | I01 | CA; | Chthoniidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Aphrastochthonius similis | Carlow's Cave pseudoscorpion | Pseudoscorpion, Carlow's Cave | J00E | I01 | CA; | Chthoniidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Apios priceana | Price's potato-bean | Potato-bean, Price's | Q1SW | P01 | AL, IL, KY, MS, TN; U.S.A. (AL, IL, KY, MS, TN) | Fabaceae | Jan 05, 1990 | Flowering Plants | 4 | Threatened | 3, 4 | US | P | Entire |
| Aplodontia rufa californica | Mountain beaver | Mountain beaver | A08X | V01 | CA; | Aplodontidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Aplodontia rufa nigra | Point Arena mountain beaver | Mountain beaver, Point Arena | A0BJ | V01 | CA; U.S.A.(CA) | Aplodontidae | Dec 12, 1991 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Aplodontia rufa phaea | Point Reyes mountain beaver | Mountain beaver, Point Reyes | A0BK | V01 | CA; | Aplodontidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Aplonis opaca | Micronesian starling | Starling, Micronesian | B0CD | V01 | Sturnidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Aplonis pelzelni | Ponape mountain starling | Starling, Ponape mountain | B00X | V01 | FM; Caroline Islands (FSM),Western Pacific | Sturnidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| apocheiridium reddelli | No common name | No common name | J03C | I01 | cheiridiidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Apochthonius malheuri | Malheur pseudoscorpion | Pseudoscorpion, Malheur | J00F | I01 | OR; | Chthoniidae | NA | Arachnids | 1 | Not Listed | 1 | US | I | Wherever found |
| Apochthonius paucispinosus | Dry Fork Valley cave pseudoscorpion | Pseudoscorpion, Dry Fork Valley cave | J00G | I01 | WV; | Chthoniidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Apocynum X floribundum | Jones' dogbane | Dogbane, Jones' | Q027 | P01 | AZ; | Apocynaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| apodemia chisosensis | chisos metalmark | No common name | I0UP | I01 | riodinidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Apodemia mormo langei | Lange's metalmark butterfly | Butterfly, Lange's metalmark | I00H | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Appalachia arcana | Michigan bog grasshopper | Grasshopper, Michigan bog | I078 | I01 | MI; Possibly extinct,not reported since 1965 | Acrididae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Aproteles bulmerae | Bulmer's fruit bat (=flying fox) | Bat, Bulmer's fruit (=flying fox) | A09W | V01 | Papua New Guinea | Pteropodidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Aptenodytes forsteri | emperor penguin | penguin, emperor | B0FB | V01 | Spheniscidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Apterocyclus honoluluensis | Kauai flightless stag beetle | Stag beetle, Kauai flightless | I0E7 | I01 | HI; | Lucanidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Aquila chrysaetos | Golden eagle | eagle, Golden | B0DV | V01 | MT, TX; | accipitridae | NA | Birds | 7 | Not Listed | 2, 6 | US | V | Wherever found |
| Aquila heliaca adalberti | Spanish imperial eagle | Eagle, Spanish imperial | B01F | V01 | Spain, Morocco, Algeria | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Aquilegia barnebyi | No common name | No common name | Q028 | P01 | CO, UT; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aquilegia caerulea daileyae | No common name | No common name | Q029 | P01 | CO; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aquilegia canadensis australis | Canadian, columbine | Columbine, Canadian, | Q02A | P01 | FL; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Aquilegia chrysantha chaplinei | [Unnamed] columbine | Columbine, [unnamed] | Q02C | P01 | NM, TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Aquilegia chrysantha hinckleyana | Hinckley's columbine | Columbine, Hinckley's | Q02B | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Aquilegia chrysantha rydbergii | [Unnamed] columbine | Columbine, [unnamed] | Q2X6 | P01 | AZ, CO, NM; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Aquilegia desertorum | No common name | No common name | Q02D | P01 | AZ; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Aquilegia grahamii | Graham's Columbine | Columbine Graham's | Q3LP | P01 | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Aquilegia jonesii | Jones' columbine | Columbine, Jones' | Q02E | P01 | MT, WY; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aquilegia laramiensis | Laramie columbine | Columbine, Laramie | Q02F | P01 | WY; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aquilegia longissima | Long spur columbine | Columbine, long spur | Q254 | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Aquilegia micrantha mancosana | Mancos columbine | Columbine, Mancos | Q02G | P01 | CO; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aquilegia saximontana | No common name | No common name | Q02H | P01 | CO; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ara ambiguus | Great green macaw | Macaw, great green | B0GJ | V01 | Psittacidae | Nov 02, 2015 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Ara glaucogularis | Blue-throated macaw | Macaw, blue-throated | B0BR | V01 | Psittacidae | Oct 03, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Ara macao ssp. cyanopterus | Scarlet macaw | macaw, Scarlet | B0GP | V01 | Psittacidae | Mar 28, 2019 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Ara macao ssp. macao | Scarlet macaw | macaw, Scarlet | B0OD | V02 | Psittacidae | Mar 28, 2019 | Birds | Foreign | Threatened | NA | Foreign | V | Northern DPS | |
| Ara macao ssp. macao | Scarlet macaw | macaw, Scarlet | B0OD | V03 | Psittacidae | Mar 28, 2019 | Birds | Foreign | Similarity of Appearance to a Threatened Taxon | NA | Foreign | V | Southern DPS | |
| Ara militaris | Military macaw | Macaw, military | B0GM | V01 | Psittacidae | Nov 02, 2015 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Arabis aculeolata | Waldo rock-cress | Rock-cress, Waldo | Q02I | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arabis blepharophylla | Coast rock-cress | Rock-cress, coast | Q02J | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis bodiensis | Bodie Hills rock-cress | Rock-cress, Bodie Hills | Q2YQ | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis breweri austinae | Chico Creek rock-cress | Rock-cress, Chico Creek | Q02L | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis breweri pecuniaria | San Bernardino rock-cress | Rock-cress, San Bernardino | Q02K | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis constancei | Constance's rock-cress | Rock-cress, Constance's | Q02M | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis crandallii | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q02N | P01 | CO, WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis demissa languida | Daggett, rock-cress | Rock-cress, Daggett, | Q02O | P01 | UT, WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis demissa russeola | Daggett, rock-cress | Rock-cress, Daggett, | Q02P | P01 | CO, UT, WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis dispar | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2X7 | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis falcatoria | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2YR | P01 | NV, UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Arabis falcifructa | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2YS | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis fecunda | Sapphire Mt. rock-cress | Rock-cress, Sapphire Mt. | Q2YT | P01 | MT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis fructicosa | Fruit rock-cress | Rock-cress, fruit | Q02Q | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis georgiana | Georgia rockcress | Rockcress, Georgia | Q02R | P01 | AL, GA; | Brassicaceae | Oct 14, 2014 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Arabis gracilipes | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q02S | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Arabis gunnisoniana | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q02T | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis hoffmannii | Hoffmann's rock-cress | Rock-cress, Hoffmann's | Q02U | P01 | CA; U.S.A. (CA) | Brassicaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Arabis johnstonii | Johnston's rock-cress | Rock-cress, Johnston's | Q02V | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis koehleri koehleri | Koehler's rock-cress | Rock-cress, Koehler's | Q02W | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Arabis koehleri stipitata | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q02X | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arabis macdonaldiana | McDonald's rock-cress | Rock-cress, McDonald's | Q1SX | P01 | CA, OR; U.S.A. (CA) | Brassicaceae | Sep 29, 1978 | Flowering Plants | 8 | Endangered | 1, 8 | US | P | Wherever found |
| Arabis mcdonaldiana | Preston Peak rock-cress | Rock-cress, Preston Peak | Q256 | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arabis missouriensis deamii | No common name | No common name | Q255 | P01 | AR, IN, MI, MO, WI; | Brassicaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Arabis modesta | Modest rock-cress | Rock-cress, modest | Q02Y | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arabis ophira | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2YU | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis oregana | Oregon rock-cress | Rock-cress, Oregon | Q02Z | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arabis oxylobula | Schreiber's manzanita | Manzanita, Schreiber's | Q030 | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis parishii | Parish's rock-cress | Rock-cress, Parish's | Q031 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis perstellata | Braun's rock-cress | Rock-cress, Braun's | Q1SY | P01 | KY, TN; U.S.A. (TN, KY) | Brassicaceae | Jan 03, 1995 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Arabis petiolaris | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2X8 | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Arabis pygmaea | Pygmy rock-cress | Rock-cress, pygmy | Q032 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis rigidissima demota | Galena Creek rock-cress | Rock-cress, Galena Creek | Q2YV | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis serotina | Shale barren rock cress | rock cress, Shale barren | Q2XA | P01 | VA, WV; U.S.A. (WV, VA) | Brassicaceae | Jul 13, 1989 | Flowering Plants | 5 | Endangered | 5 | US | P | Wherever found |
| Arabis shockleyi | Shockley's rock-cress | Rock-cress, Shockley's | Q2XB | P01 | CA, NV, UT; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Arabis sp. | Sp. nov. ined. (Del Norte) rock-cress | Rock-cress, sp. nov. ined. (Del Norte) | Q2YW | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Del Norte |
| Arabis sp. | Sp. nov. ined. (Gray Knolls) rock-cress | Rock-cress, sp. nov. ined. (Gray Knolls) | Q257 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Gray Knolls |
| Arabis suffrutescens horizontalis | No common name | No common name | Q033 | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Arabis tiehmii | Tiehm's rock-cress | Rock-cress, Tiehm's | Q2YX | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arabis vivariensis | Park rock-cress | Rock-cress, Park | Q2RO | P01 | CO, UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arabis williamsii | [Unnamed] rock-cress | Rock-cress, [unnamed] | Q2N3 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aratinga guarouba | Golden conure | conure, Golden | B05B | V01 | Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Arborimus albipes | White-footed vole | Vole, white-footed | A0F7 | V01 | CA, OR; | Muridae | NA | Mammals | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Arborimus longicaudus | red tree vole | vole, red tree | A0J3 | V02 | OR; | Cricetidae | NA | Mammals | 1 | Candidate | 1 | US | V | North Oregon Coast population |
| Arborimus pomo | California red tree vole | Vole, California red tree | A0HF | V01 | CA, OR; | Muridae | NA | Mammals | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Arcanator orostruthus | Dappled mountain robin | Robin, dappled mountain | B0A3 | V01 | Tanzania, Mozambique | Sylviidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Arceuthobium apachense | No common name | No common name | Q034 | P01 | AZ; | Loranthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Archeolarca aalbui | Aalbu's cave pseudoscorpion | Pseudoscorpion, Aalbu's cave | J00H | I01 | CA; | Garypidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Archeolarca cavicola | Grand Canyon cave pseudoscorpion | Pseudoscorpion, Grand Canyon cave | J00I | I01 | AZ; | Garypidae | NA | Arachnids | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Archeolarca guadalupensis | Guadalupe cave pseudoscorpion | Pseudoscorpion, Guadalupe cave | J00J | I01 | TX; | Garypidae | NA | Arachnids | 2 | Not Listed | 2 | US | I | Wherever found |
| archeolarca welbourni | No common name | No common name | J03D | I01 | garypidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Archoplites interruptus | Sacramento perch | Perch, Sacramento | E06M | V01 | CA; | Centrarchidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Arctocephalus townsendi | Guadalupe fur seal | Seal, Guadalupe fur | A0A8 | V01 | CA; U.S.A. (Farallon Islands of CA) south to Mexico (Islas Revillagigedo) | Phocidae | Mar 11, 1967 | Mammals | NMFS | Threatened | 8 | US/Foreign | V | Wherever found |
| Arctomecon californica | [Unnamed] desert-poppy | Desert-poppy, [unnamed] | Q258 | P01 | AZ, NV; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Arctomecon humilis | Dwarf Bear-poppy | Bear-poppy, Dwarf | Q1SZ | P01 | UT; U.S.A. (UT) | Papaveraceae | Dec 06, 1979 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Arctomecon merriamii | White bear desert-poppy | Desert-poppy, white bear | Q035 | P01 | CA, NV; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos andersonii | Santa Cruz manzanita | Manzanita, Santa Cruz | Q2RP | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos auriculata | Mt. Diablo manzanita | Manzanita, Mt. Diablo | Q03N | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos bakeri bakeri | Baker's manzanita | Manzanita, Baker's | Q03O | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos catalinae | Santa Catalina Island manzanita | Manzanita, Santa Catalina Island | Q25A | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos confertiflora | Santa Rosa Island manzanita | Manzanita, Santa Rosa Island | Q037 | P01 | CA; U.S.A. (CA) | Ericaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Arctostaphylos cruzensis | Arroyo de la Cruz manzanita | Manzanita, Arroyo de la Cruz | Q038 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos densiflora | Vine Hill manzanita | Manzanita, Vine Hill | Q25B | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos edmundsii | Little Sur manzanita | Manzanita, Little Sur | Q039 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos franciscana | Franciscan manzanita | Manzanita, Franciscan | Q25C | P01 | CA; U.S.A. (CA) | Ericaceae | Oct 05, 2012 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Arctostaphylos gabrielensis | San Gabriel manzanita | Manzanita, San Gabriel | Q3AT | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos glandulosa ssp. crassifolia | Del Mar manzanita | Manzanita, Del Mar | Q036 | P01 | CA; U.S.A. (CA), Mexico | Ericaceae | Oct 07, 1996 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Arctostaphylos glutinosa | Schreiber's manzanita | Manzanita, Schreiber's | Q3HY | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos hispidula | [Unnamed] manzanita | Manzanita, [unnamed] | Q03P | P01 | CA, OR; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arctostaphylos hookeri hearstiorum | Hearsts' manzanita | Manzanita, Hearsts' | Q03A | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos hookeri montana | Tamalpais manzanita | Manzanita, Tamalpais | Q03B | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| arctostaphylos hookeri ssp. hookeri | Hooker's manzanita | manzanita, Hooker's | Q3JC | P01 | ericaea | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Arctostaphylos hookeri var. ravenii | Presidio Manzanita | Manzanita, Presidio | Q1T0 | P01 | CA; U.S.A. (CA) | Ericaceae | Nov 29, 1979 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Arctostaphylos imbricata | San Bruno Mountain manzanita | Manzanita, San Bruno Mountain | Q03C | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos intricata oblongifolia | [Unnamed] manzanita | Manzanita, [unnamed] | Q2XD | P01 | CA, OR; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arctostaphylos klamathensis | Klamath manzanita | Manzanita, Klamath | Q2N4 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos luciana | Santa Lucia manzanita | Manzanita, Santa Lucia | Q03D | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos montaraensis | Montara manzanita | Manzanita, Montara | Q03E | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos montereyensis | Monterrey manzanita | Manzanita, Monterrey | Q03F | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos morroensis | Morro manzanita | Manzanita, Morro | Q259 | P01 | CA; U.S.A. (CA) | Ericaceae | Dec 15, 1994 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Arctostaphylos myrtifolia | Ione manzanita | Manzanita, Ione | Q03G | P01 | CA; U.S.A. (CA) | Ericaceae | May 26, 1999 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Arctostaphylos nissenana | Nissenan manzanita | Manzanita, Nissenan | Q2XC | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos nortensis | Del Norte manzanita | Manzanita, Del Norte | Q3AU | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos osoensis | Oso manzanita | Manzanita, Oso | Q3AV | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos otayensis | Otay manzanita | Manzanita, Otay | Q03H | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos pacifica | Pacific manzanita | Manzanita, Pacific | Q03Q | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos pajaroensis | Pajaroensis manzanita | Manzanita, Pajaroensis | Q3AW | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos pallida | Pallid manzanita | Manzanita, pallid | Q03I | P01 | CA; U.S.A. (CA) | Ericaceae | Apr 22, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Arctostaphylos pechoensis | Pecho manzanita | Manzanita, pecho | Q03J | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos pilosula pilosula | Santa Margarita manzanita | Manzanita, Santa Margarita | Q25D | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos pumila | Sandmat manzanita | Manzanita, sandmat | Q03K | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| arctostaphylos rainbowensis | Rainbow manzanita | manzanita, Rainbow | Q3JK | P01 | ericaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Arctostaphylos refugioensis | Refugio manzanita | Manzanita, Refugio | Q03L | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos rudis | Sand mesa manzanita | Manzanita, sand mesa | Q25E | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos silvicola | Bonny Doon manzanita | Manzanita, Bonny Doon | Q03M | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos stanfordiana raichei | Raiches manzanita | Manzanita, Raiches | Q3AX | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos tomentosa daciticola | Dacite manzanita | Manzanita, dacite | Q3AY | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos uva-ursi leobreweri | Leo Brewer's manzanita | Manzanita, Leo Brewer's | Q2N5 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos uva-ursi marinensis | Point Reyes manzanita | Manzanita, Point Reyes | Q2N6 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos uva-ursi monoensis | Mono manzanita | Manzanita, Mono | Q2N7 | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos uva-ursi suborbiculata | Kamchatka Point manzanita | Manzanita, Kamchatka Point | Q2XE | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arctostaphylos virgata | Marin manzanita | Manzanita, Marin | Q03R | P01 | CA; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ardea herodias | Great blue heron | heron, Great blue | B0DW | V01 | ardeidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Ardeotis (=Choriotis) nigriceps | Great Indian bustard | Bustard, great Indian | B014 | V01 | Pakistan, India | Otidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Arenaria alabamensis | Alabama sandwort | Sandwort, Alabama | Q03S | P01 | AL, GA, NC; | Caryophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Arenaria cumberlandensis | Cumberland sandwort | Sandwort, Cumberland | Q25F | P01 | KY, TN; U.S.A. (TN, KY) | Caryophyllaceae | Jun 23, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Arenaria franklinii thompsonii | No common name | No common name | Q03U | P01 | OR, WA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Arenaria kingii rosea | No common name | No common name | Q03W | P01 | NV; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arenaria livermorensis | Livermore sandwort | Sandwort, Livermore | Q03X | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Arenaria macradenia kuschei | Forest Camp sandwort | Sandwort, Forest Camp | Q25G | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arenaria paludicola | Marsh Sandwort | Sandwort, Marsh | Q25H | P01 | CA, WA; U.S.A. (WA, OR, CA) | Caryophyllaceae | Aug 03, 1993 | Flowering Plants | 8 | Endangered | 1, 8 | US | P | Wherever found |
| Arenaria stenomeres | No common name | No common name | Q03Y | P01 | NV; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arenaria ursina | Bear Valley sandwort | Sandwort, Bear Valley | Q03Z | P01 | CA; U.S.A. (CA) | Caryophyllaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Areniscythris brachypteris | Oso Flaco flightless moth | Moth, Oso Flaco flightless | I0NW | I01 | CA; | Scythrididae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Argemone arizonica | Arizona prickle-poppy | Prickle-poppy, Arizona | Q040 | P01 | AZ; | Papaveraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Argemone glauca inermis | No common name | No common name | Q041 | P01 | HI; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Argemone munita robusta | Robust prickly-poppy | Prickly-poppy, robust | Q042 | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Argemone pleiacantha ssp. pinnatisecta | Sacramento prickly poppy | Poppy, Sacramento prickly | Q1T1 | P01 | NM; U.S.A. (NM) | Papaveraceae | Aug 24, 1989 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Argia sabino | Sabino Canyon damselfly | Damselfly, Sabino Canyon | I0KW | I01 | AZ; | Coenagrionidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Sabino Canyon |
| Argia sp. | Balmorhea damselfly | Damselfly, Balmorhea | I0KV | I01 | TX; | Coenagrionidae | NA | Insects | 2 | Not Listed | 2 | US | I | Balmorhea |
| Argyresthia castaneela | Chestnut ermine moth | Ermine moth, chestnut | I06U | I01 | NH, VT; Possibly extinct,not reported since 1965 | Argyresthiidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Argyroxiphium caliginis | Eke silversword | Silversword, eke | Q3MM | P01 | Asteraceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Argyroxiphium kauense | Mauna Loa (=Ka'u) silversword | Silversword, Mauna Loa (=Ka'u) | Q1T2 | P01 | HI; U.S.A. (HI) | Asteraceae | Apr 07, 1993 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Argyroxiphium sandwicense ssp. macrocephalum | `Ahinahina | `Ahinahina | Q1T3 | P01 | HI; U.S.A. (HI) | Asteraceae | May 15, 1992 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Argyroxiphium sandwicense ssp. sandwicense | `Ahinahina | `Ahinahina | Q25I | P01 | HI; U.S.A. (HI) | Asteraceae | Mar 21, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Argyroxiphium virescens | Greensword | Greensword | Q043 | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Argythamnia aphoroides | Wild, Hill Country mercury | Mercury, wild, Hill Country | Q044 | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Argythamnia argyraea | Wild, silvery mercury | Mercury, wild, silvery | Q1T4 | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Argythamnia blodgettii | Blodgett's silverbush | silverbush, Blodgett's | Q045 | P01 | FL; Miami-Dade and Monroe Counties | Euphorbiaceae | Oct 31, 2016 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Arianops sandersoni | Magazine Mountain mold beetle | Mold beetle, Magazine Mountain | I0LF | I01 | AR; | Pselaphidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Arida arizonica | No common name | No common name | Q1YQ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Arida arizonica | Desert tansyaster | Tansyaster, Desert | Q16M | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| arida mattturneri | No common name | No common name | Q3LD | P01 | asteraceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Aristida chaseae | No common name | No common name | Q2YY | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Poaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Aristida floridana | [Unnamed] three-awned grass | Three-awned grass, [unnamed] | Q046 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Aristida portoricensis | Pelos del diablo | Pelos del diablo | Q25J | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Poaceae | Aug 08, 1990 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Aristida simpliciflora | Southern three-awned grass | Three-awned grass, southern | Q047 | P01 | AL, FL, MS; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Aristocapsa insignis | Indian Valley spineflower | Spineflower, Indian Valley | Q048 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| arizona elegans | Glossy snake | snake, Glossy | C06I | V01 | colubridae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Arkansia wheeleri | Ouachita rock pocketbook | Pocketbook, Ouachita rock | F00U | I01 | AR, OK; U.S.A. (OK, AR) | Unionidae | Oct 23, 1991 | Clams | 2 | Endangered | 2, 4 | US | I | Wherever found |
| Arnica amplexicaulis piperi | No common name | No common name | Q049 | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Arnica cordifolia | No common name | No common name | Q2XF | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Arnica lonchophylla | No common name | No common name | Q3AZ | P01 | CA, MN; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3, 8 | US | P | Wherever found |
| Arnica venosa | No common name | No common name | Q3HZ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Arnica viscosa | Shasta arnica | Arnica, Shasta | Q04A | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Arnoglossum diversifolium | Variable leaf Indian plaintain | plaintain, Variable leaf Indian | Q09P | P01 | AL, FL, GA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Arremonops rufivirgatus rufivirgatus | Texas olive sparrow | Sparrow, Texas olive | B08S | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Arrhyton exiguum exiguum | Culebra garden snake | Snake, Culebra garden | C03Y | V01 | PR, VI; | Colubridae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Arsapnia arapahoe | Arapahoe snowfly | Snowfly, Arapahoe | I0W0 | I01 | CO; | Capniidae | NA | Insects | 6 | Candidate | 6 | US | I | Wherever found |
| Artamus leucorhynchus pelewensis | Palau white-breasted wood-swallow | Wood-swallow, Palau white-breasted | B06N | V01 | PW; Caroline Islands | Artamidae | NA | Birds | Foreign | Pre-Act Delisting (or clearance--removal from the Lists) | NA | Foreign | V | Wherever found |
| Artemia monica | Mono Lake brine shrimp | Brine shrimp, Mono Lake | K02I | I01 | CA; | Artemiidae | NA | Crustaceans | 1 | Not Listed | 8 | US | I | Wherever found |
| Artemisia | Sp. nov. ined. artemisia | Artemisia, sp. nov. ined. | Q1T5 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Artemisia aleutica | Aleutian wormwood | Wormwood, Aleutian | Q04B | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Artemisia argilosa | Coaltown sagebrush | Sagebrush, Coaltown | Q04C | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Artemisia biennis diffusa | No common name | No common name | Q3B0 | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Artemisia campestris var. wormskioldii | Northern Wormwood | Wormwood, Northern | Q2XG | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Artemisia cana bolanderi | Bolander's sagebrush | Sagebrush, Bolander's | Q2XH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Artemisia globularia lutea | [Unnamed] wormwood | Wormwood, [unnamed] | Q2Z0 | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Artemisia glomerata subglabra | [Unnamed] wormwood | Wormwood, [unnamed] | Q2Z1 | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Artemisia ludoviciana estesii | No common name | No common name | Q2N8 | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| artemisia palmeri | San Diego sagewort | sagewort, San Diego | Q3J5 | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Artemisia papposa | No common name | No common name | Q04D | P01 | ID, NV, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Artemisia porteri | Porter sagebrush | Sagebrush, Porter | Q04E | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Artemisia senjavinensis | Arctic sage | Sage, Arctic | Q25K | P01 | AK; U.S.S.R | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Artemisia unalaskensis aleutica | No common name | No common name | Q25L | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Arthonia cupressina | Golden spruce dots | spruce dots, Golden | U00U | P01 | NC; | Arthoniaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Arthonia kermesina | Hot dots | dots, Hot | U00V | P01 | NC; | Arthoniaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Arthopyrenia betulicola | Old birch spots | Spots, Old Birch | U00W | P01 | NC; | Arthopyreniaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Asaphomyia floridensis | Florida asaphomyian tabanid fly | Tabanid fly, Florida asaphomyian | I0EI | I01 | FL; | Tabanidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Asaphomyia texanus | Texas asaphomyian tabanid fly | Tabanid fly, Texas asaphomyian | I0EJ | I01 | TX; Possibly extinct,not reported since 1965 | Tabanidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Ascaphus truei | Tailed frog | Frog, tailed | D02O | V01 | CA, ID, MT, OR, WA; | Ascaphidae | NA | Amphibians | 1 | Not Listed | 1, 6, 8 | US | V | Wherever found |
| Ascetocthere cosmeta | Grayson crayfish ostracod | Ostracod, Grayson crayfish | K04E | I01 | NC, VA; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Aschisma kansanum | Kansas aschisma moss | moss Kansas aschisma | U00G | P01 | Pottiaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Asclepias cutleri | Cutler milkweed | Milkweed, Cutler | Q04F | P01 | AZ, UT; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Asclepias eastwoodiana | Eastwood's milkweed | Milkweed, Eastwood's | Q04G | P01 | NV; | Asclepiadaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Asclepias meadii | Mead's milkweed | Milkweed, Mead's | Q1T6 | P01 | IA, IL, IN, KS, MO, WI; U.S.A. (WI, MO, KS, IN, IL, IA) | Asclepiadaceae | Sep 01, 1988 | Flowering Plants | 3 | Threatened | 3, 6 | US | P | Wherever found |
| Asclepias prostrata | [Unnamed] milkweed | Milkweed, [unnamed] | Q2XI | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Asclepias ruthiae | Ruth milkweed | Milkweed, Ruth | Q04H | P01 | UT; | Asclepiadaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Asclepias sanjuanensis | San Juan milkweed | Milkweed, San Juan | Q2Z2 | P01 | NM; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Asclepias uncialis | [Unnamed] milkweed | Milkweed, [unnamed] | Q3B1 | P01 | CO, KS, NM; | Asclepiadaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Asclepias viridula | [Unnamed] milkweed | Milkweed, [unnamed] | Q04I | P01 | FL; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Asclepias welshii | Welsh's milkweed | Milkweed, Welsh's | Q25M | P01 | AZ, UT; U.S.A. (UT, AZ) | Asclepiadaceae | Oct 28, 1987 | Flowering Plants | 6 | Threatened | 2, 6 | US | P | Wherever found |
| Ashmunella hebardi | Hacheta Grande woodlandsnail | Woodlandsnail, Hacheta Grande | G095 | I01 | NM; | Polygyridae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Ashmunella macromphala | Cooke's Peak woodlandsnail | Woodlandsnail, Cooke's Peak | G096 | I01 | NM; | Polygyridae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Ashmunella pasonis | Franklin Mountain wood snail | Wood snail, Franklin Mountain | G045 | I01 | TX; | Polygyridae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Asimina tetramera | Four-petal pawpaw | Pawpaw, four-petal | Q1T7 | P01 | FL; U.S.A. (FL) | Annonaceae | Sep 26, 1986 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Asio flammeus | Short-eared Owl | Owl, Short-eared | B0HD | V01 | Strigidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Asio flammeus ponapensis | Ponape short-eared owl | Owl, Ponape short-eared | B06E | V01 | FM; Caroline Islands (FSM) | Strigidae | NA | Birds | Foreign | Pre-Act Delisting (or clearance--removal from the Lists) | NA | Foreign | V | Wherever found |
| Asio flammeus sandwichensis | Hawaiian short-eared owl | Owl, Hawaiian short-eared | B0AQ | V01 | HI; | Strigidae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| asio otus | Long-eared owl | owl, Long-eared | B0E3 | V01 | strigidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| aspidoscelis arizonae | arizona striped whiptail | No common name | C072 | V01 | teiidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Aspiduchus cavernicola | Tuna Cave roach | Roach, Tuna Cave | I0CL | I01 | PR, VI; | Blaberidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Aspiromitus appalachianus | A Hornwort | No common name | Q3SS | P01 | NC; | Anthocerotaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Asplenium adiantum-nigrum | [Unnamed] spleenwort | Spleenwort, [unnamed] | S000 | P01 | AZ, CO, UT; | Aspleniaceae | NA | Ferns and Allies | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Asplenium dielerectum | Asplenium-leaved diellia | diellia, Asplenium-leaved | S00P | P01 | HI; U.S.A. (HI) | Aspleniaceae | Nov 10, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium dielfalcatum | No common name | No common name | S00Q | P01 | HI; U.S.A. (HI) | Aspleniaceae | Oct 29, 1991 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium diellaciniatum | No common name | No common name | S02K | P01 | HI; Asplenium diellaciniatum is historically known from the islands of Kauai in the Kawaiiki Valley (Lorence et al. 2013, pp. 166-174). ; Currently, there is one population of Asplenium diellaciniatum in Kawaiiki Valley on the island of Kauai (Lorence et al. 2013, pp. 166-174; PEPP 2014, in litt.). | Aspleniaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium dielmannii | No common name | No common name | S007 | P01 | HI; U.S.A. (HI) | Aspleniaceae | May 13, 2010 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium dielpallidum | No common name | No common name | S022 | P01 | HI; U.S.A. (HI) | Aspleniaceae | Feb 25, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium ebenoides | Scott's spleenwort | Spleenwort, Scott's | S01G | P01 | AL, AR, CT, DE, GA, IL, MA, MO, NC, NJ, OH, PA, TN, VA, WV; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Asplenium heteroresiliens | [Unnamed] spleenwort | Spleenwort, [unnamed] | S010 | P01 | AL, FL, GA, NC, SC; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Asplenium kentuckiense | [Unnamed] spleenwort | Spleenwort, [unnamed] | S01H | P01 | AR, IL, IN, KY, OH, VA; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Asplenium leucostegioides | [Unnamed] spleenwort | Spleenwort, [unnamed] | S001 | P01 | HI; Believed to be extinct | Aspleniaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Asplenium peruvianum var. insulare | No common name | No common name | S00N | P01 | HI; U.S.A. (HI) | Aspleniaceae | Sep 26, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Asplenium plenum | [Unnamed] spleenwort | Spleenwort, [unnamed] | S011 | P01 | FL; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Asplenium schizophyllum | No common name | No common name | S01P | P01 | HI; | Aspleniaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Asplenium scolopendrium var. americanum | American hart's-tongue fern | Fern, American hart's-tongue | S00O | P01 | AL, MI, NY, TN; Canada (Ont.); U.S.A. (TN, NY, MI, AL), Canada (Ont.) | Aspleniaceae | Jul 14, 1989 | Ferns and Allies | 5 | Threatened | 3, 4, 5 | US/Foreign | P | Wherever found |
| Asplenium unisorum | No common name | No common name | S01T | P01 | HI; U.S.A. (HI) | Aspleniaceae | Jun 27, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Assiminea infima | Badwater snail | Snail, Badwater | G00N | I01 | CA; | Assimineidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Assiminea pecos | Pecos assiminea snail | Snail, Pecos assiminea | G03K | I01 | NM, TX; U.S.A. (TX, NM) | Assimineidae | Aug 09, 2005 | Snails | 2 | Endangered | 2 | US/Foreign | I | Wherever found |
| Astelia veratroides gracilis | Pa`iniu | Pa`iniu | Q2XJ | P01 | HI; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astelia veratroides macrosperma | Pa`iniu | Pa`iniu | Q2XK | P01 | HI; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astelia veratroides veratroides | Pa`iniu | Pa`iniu | Q2XL | P01 | HI; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astelia waialealae | Pa`iniu | Pa`iniu | Q3GT | P01 | HI; U.S.A. (HI) | Liliaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Aster chilensis lentus | Suisun aster | Aster, Suisun | Q04L | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Aster greatai | [Unnamed] aster | Aster, [unnamed] | Q2XN | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Aster kingii barnebyana | No common name | No common name | Q2Z6 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aster kingii kingii | [Unnamed] aster | Aster, [unnamed] | Q04R | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Aster laevis guadalupensis | Guadalupe smooth aster | Aster, Guadalupe smooth | Q3B2 | P01 | NM, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Aster paludicola | Western bog aster | Aster, western bog | Q25Q | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Aster sandwicensis | Hawaiian aster | Aster, Hawaiian | Q04X | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astilbe crenatiloba | Roan Mountain false goats beard | Goats beard, Roan Mountain false | Q2RQ | P01 | TN; Possibly extinct | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Astragalus accumbens | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q051 | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus ackermanii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q25S | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus aequalis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q052 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus agnicidus | Humboldt milk-vetch | Milk-vetch, Humboldt | Q053 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus albens | Cushenbury milk-vetch | Milk-vetch, Cushenbury | Q2Z7 | P01 | CA; U.S.A. (CA) | Fabaceae | Aug 24, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus altus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q054 | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus alvordensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q055 | P01 | NV, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Astragalus amnis-amissi | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q058 | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus amphioxys musimonum | No common name | No common name | Q056 | P01 | AZ, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Astragalus ampullarioides | Shivwits milk-vetch | Milk-vetch, Shivwits | Q2ZA | P01 | UT; U.S.A. (UT) | Fabaceae | Sep 28, 2001 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Astragalus ampullarius | Gumbo milk-vetch | Milk-vetch, gumbo | Q057 | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus anisus | Gunnison milk-vetch | Milk-vetch, Gunnison | Q3B4 | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus anserinus | Goose Creek milkvetch | Milkvetch, Goose Creek | Q3B5 | P01 | ID, NV, UT; Throughout the range. | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Astragalus applegatei | Applegate's milk-vetch | Milk-vetch, Applegate's | Q25T | P01 | CA, OR; The current range of the Applegate's milk-vetch is confined to Klamath County, Oregon from Klamath Falls to Worden, about 13 miles. The historic range was probably only slightly larger.; U.S.A. (OR) | Fabaceae | Jul 28, 1993 | Flowering Plants | 8 | Endangered | 1, 8 | US | P | Wherever found |
| Astragalus atratus inseptus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q059 | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus barnebyi | Barneby milk-vetch | Milk-vetch, Barneby | Q05B | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus barrii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2XP | P01 | MT, NE, SD, WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus beathii | Beath milk-vetch | Milk-vetch, Beath | Q05D | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus beatleyae | Beatley milk-vetch | Milk-vetch, Beatley | Q05C | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus bibullatus | Guthrie's (=Pyne's) ground-plum | Ground-plum, Guthrie's (=Pyne's) | Q2Z8 | P01 | TN; U.S.A. (TN) | Fabaceae | Sep 26, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Astragalus brandegeei | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3B6 | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus brauntonii | Braunton's milk-vetch | Milk-vetch, Braunton's | Q05E | P01 | CA; U.S.A. (CA) | Fabaceae | Jan 29, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus callithrix | Calloway milk-vetch | Milk-vetch, Calloway | Q05F | P01 | NV, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Astragalus calycosus monophyllidius | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q25U | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus camptopus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q25V | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus castetteri | Castetter milk-vetch | Milk-vetch, Castetter | Q05G | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus ceramicus apus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2XQ | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus chloodes | Grass milk-vetch | Milk-vetch, grass | Q05H | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus cimae cimae | Cima rattleweed | Rattleweed, Cima | Q05I | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus cimae sufflatus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q25W | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus clarianus | Clara Hunt's milk-vetch | Milk-vetch, Clara Hunt's | Q05J | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus cobrensis maguirei | Coppermine milk-vetch | Milk-vetch, coppermine | Q3B7 | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus collinus laurentii | No common name | No common name | Q2Z9 | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus columbianus | Columbia milk-vetch | Milk-vetch, Columbia | Q05K | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus consobrinus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q05L | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus convallarius finitimus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q05M | P01 | NV, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Astragalus cottamii | Cottam milk-vetch | Milk-vetch, Cottam | Q05N | P01 | AZ, NM, UT; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus cottonii | Cotton's milk-vetch | milk-vetch, Cotton's | Q05A | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus cremnophylax myriorrhaphis | Cliff milk-vetch | Milk-vetch, cliff | Q05O | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus cremnophylax var. cremnophylax | Sentry milk-vetch | Milk-vetch, Sentry | Q1T8 | P01 | AZ; U.S.A. (AZ) | Fabaceae | Dec 05, 1990 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Astragalus cronquistii | Cronquist milk-vetch | Milk-vetch, Cronquist | Q05P | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus cusickii var. packardiae | Packard's milkvetch | Milkvetch, Packard's | Q3N8 | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus deanei | Deane's milk-vetch | Milk-vetch, Deane's | Q05Q | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus debequaeus | Debeque milk-vetch | milk-vetch, Debeque | Q2RR | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus desereticus | Deseret milkvetch | milkvetch, Deseret | Q05R | P01 | UT; U.S.A. (UT) | Fabaceae | Oct 20, 1999 | Flowering Plants | 6 | Recovery | 6 | US | P | Wherever found |
| Astragalus deterior | Cliff-palace milk-vetch | Milk-vetch, cliff-palace | Q05S | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus detritalis | Debris milk-vetch | Milk-vetch, debris | Q05T | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus diaphanus diurnus | No common name | No common name | Q2RS | P01 | OR, WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus douglasii perstrictus | Jacumba milk-vetch | Milk-vetch, Jacumba | Q2NA | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus drabelliformis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q05U | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus duchesnensis | Duchesne milk-vetch | Milk-vetch, Duchesne | Q05V | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus ensiformis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q05W | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus equisolensis | Horseshoe milk-vetch | Milk-vetch, horseshoe | Q2NB | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus ertterae | Ertter's milk-vetch | Milk-vetch, Ertter's | Q2ZB | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus eurylobus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZC | P01 | NV; | Fabacaeae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus funereus | Black wooly-pod | Wooly-pod, black | Q05X | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus geyeri triquetrus | No common name | No common name | Q05Y | P01 | AZ, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Astragalus gilmanii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3B8 | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus gilviflorus var. purpureus | No common name | No common name | Q3B9 | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus gypsodes | Gypsum milk-vetch | Milk-vetch, gypsum | Q2XR | P01 | NM, TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus hamiltonii | Hamilton milk-vetch | Milk-vetch, Hamilton | Q05Z | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus harrisonii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q060 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus henrimontanensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q061 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus holmgreniorum | Holmgren milk-vetch | Milk-vetch, Holmgren | Q2NC | P01 | AZ, UT; U.S.A. (UT, AZ) | Fabaceae | Sep 28, 2001 | Flowering Plants | 6 | Endangered | 2, 6 | US | P | Wherever found |
| Astragalus hoodianus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q25X | P01 | OR, WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus howellii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3BA | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus humillimus | Mancos milk-vetch | Milk-vetch, Mancos | Q1T9 | P01 | CO, NM; U.S.A. (NM, CO) | Fabaceae | Jun 27, 1985 | Flowering Plants | 2 | Endangered | 2, 6 | US | P | Wherever found |
| Astragalus hypoxylus | Huachuca milk-vetch | Milk-vetch, Huachuca | Q3BB | P01 | AZ; Mexico (Sonora) | Fabaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Astragalus iodanthus pseudoiodanthus | Tonopah milk-vetch | Milk-vetch, Tonopah | Q062 | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus iselyi | Isely milk-vetch | Milk-vetch, Isely | Q063 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Under Review in the Candidate or Petition Process | 6 | US | P | Wherever found |
| Astragalus jaegerianus | Lane Mountain milk-vetch | Milk-vetch, Lane Mountain | Q064 | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 06, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus jejunus articulatus | No common name | No common name | Q3BC | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus johannis-howellii | Long Valley milk-vetch | Milk-vetch, Long Valley | Q065 | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus kentrophyta douglasii | Thistle, Douglas' milk-vetch | Milk-vetch, thistle, Douglas' | Q066 | P01 | OR, WA; Believed to be extinct | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus kerrii | Kerr's milk-vetch | Milk-vetch, Kerr's | Q2ZD | P01 | Fabaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Astragalus knightii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2RT | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus lancearius | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q067 | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus lentiformis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZE | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus ambiguus | No common name | No common name | Q3I0 | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus lentiginosus antonius | No common name | No common name | Q2RU | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus chartaceus | San Pitch Valley milk-vetch | Milk-vetch, San Pitch Valley | Q2XS | P01 | CA, CO, ID, OR, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Astragalus lentiginosus latus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06A | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus maricopae | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06B | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus lentiginosus micans | Shining milk-vetch | Milk-vetch, shining | Q068 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus pohlii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2RV | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus lentiginosus scorpionis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3BD | P01 | NV, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Astragalus lentiginosus sesquimetralis | Sodaville milk-vetch | Milk-vetch, Sodaville | Q069 | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus sierrae | Big Bear milk-vetch | Milk-vetch, Big Bear | Q2RW | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus lentiginosus ursinus | Bear Valley milk-vetch | Milk-vetch, Bear Valley | Q06C | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus lentiginosus var. coachellae | Coachella Valley milk-vetch | Milk-vetch, Coachella Valley | Q25Y | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 06, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus lentiginosus var. piscinensis | Fish Slough milk-vetch | Milk-vetch, Fish Slough | Q25Z | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 06, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Astragalus leucolobus | Bear Valley wooly-pod | Wooly-pod, Bear Valley | Q2ZF | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus limnocharis limnocharis | No common name | No common name | Q06D | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus limnocharis tabulaeus | No common name | No common name | Q06E | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus linifolius | Grand Junction milk-vetch | Milk-vetch, Grand Junction | Q06F | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus loanus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06G | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus lutosus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06H | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus magdalenae var. peirsonii | Peirson's milk-vetch | Milk-vetch, Peirson's | Q2ND | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 06, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Astragalus malacoides | Kaiparowits milk-vetch | Milk-vetch, Kaiparowits | Q06I | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus michauxii | Sandhills milk-vetch | Milk-vetch, sandhills | Q2ZG | P01 | GA, NC, SC; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Astragalus microcymbus | Skiff milkvetch | Milkvetch, skiff | Q06J | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Candidate | 6 | US | P | Wherever found |
| Astragalus minthorniae gracilior | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06K | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus misellus pauper | Pauper milk-vetch | Milk-vetch, pauper | Q06L | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus mohavensis hemigyrus | Curve-podded Mojave milk-vetch | Milk-vetch, curve-podded Mojave | Q06M | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus mollissimus marcidus | Withered wooly milk-vetch | Milk-vetch, withered wooly | Q06N | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus molybdenus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3BE | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus monoensis monoensis | Mono milk-vetch | Milk-vetch, Mono | Q06O | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus monoensis ravenii | Raven's milk-vetch | Milk-vetch, Raven's | Q06P | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus montii | Heliotrope milk-vetch | Milk-vetch, heliotrope | Q260 | P01 | UT; U.S.A. (UT) | Fabaceae | Nov 06, 1987 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Astragalus monumentalis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06Q | P01 | AZ, CO, NM, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus mulfordiae | Mulford's milk-vetch | Milk-vetch, Mulford's | Q06R | P01 | ID, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus naturitensis | Naturita milk-vetch | Milk-vetch, naturita | Q06S | P01 | CO, NM; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus neglectus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZH | P01 | MI, MN, OH, WI; | Fabaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Astragalus nevinii | San Clemente Island milk-vetch | Milk-vetch, San Clemente Island | Q2NE | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus nidularius | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2XT | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus nutriosensis | Nutriosa milk-vetch | Milk-vetch, Nutriosa | Q3BF | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus nyensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06T | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus oniciformis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q261 | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus oocalycis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06W | P01 | CO, NM; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus oocarpus | Descanso milk-vetch | Milk-vetch, Descanso | Q2RX | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus oophorus clokeyanus | Clokey's egg-vetch | Egg-vetch, Clokey's | Q06U | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus oophorus lavinii | Lavin's milk-vetch | Milk-vetch, Lavin's | Q2ZI | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus oophorus lonchocalyx | No common name | No common name | Q06V | P01 | NV, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Astragalus osterhoutii | Osterhout milkvetch | milkvetch, Osterhout | Q1TA | P01 | CO; U.S.A. (CO) | Fabaceae | Jul 13, 1989 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Astragalus pachypus jaegeri | Jaeger's bush milk-vetch | Milk-vetch, Jaeger's bush | Q3BG | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus panamintensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2XU | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus pardalinus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06Y | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus pauperculus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06Z | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus paysonii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q06X | P01 | ID, WY; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Astragalus peckii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2RY | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus perianus | Rydberg milk-vetch | Milk-vetch, Rydberg | Q070 | P01 | UT; | Fabaceae | May 27, 1978 | Flowering Plants | 6 | Original Data in Error - New Information Discovered | 6 | US | P | Entire |
| Astragalus phoenix | Ash meadows milk-vetch | Milk-vetch, Ash meadows | Q1TB | P01 | NV; U.S.A. (NV) | Fabaceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Astragalus porrectus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q071 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus preussii cutleri | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZJ | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus proimanthus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q072 | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus proximus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q3BH | P01 | CO, NM; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus pterocarpus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q073 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus pulsiferae suksdorfii | No common name | No common name | Q3BI | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus puniceus gertrudis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q074 | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus purshii ophiogenes | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q075 | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus pycnostachyus var. lanosissimus | Ventura Marsh Milk-vetch | Milk-vetch, Ventura Marsh | Q076 | P01 | CA; U.S.A. (CA) | Fabaceae | May 21, 2001 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus rafaelensis | San Rafael milk-vetch | Milk-vetch, San Rafael | Q077 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus remotus | Spring Mountain milk-vetch | Milk-vetch, Spring Mountain | Q2RZ | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus ripleyi | Ripley milk-vetch | Milk-vetch, Ripley | Q3BJ | P01 | CO, NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus robbinsii alpiniformis | Robbins, milk-vetch | Milk-vetch, Robbins, | Q079 | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus robbinsii occidentalis | Robbins, western ssp. milk-vetch | Milk-vetch, Robbins, western ssp. | Q078 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus robbinsii robbinsii | Robbins, milk-vetch | Milk-vetch, Robbins, | Q3I1 | P01 | VT; Believed to be extinct | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Astragalus robbinsii var. jesupi | Jesup's milk-vetch | Milk-vetch, Jesup's | Q1TC | P01 | NH, VT; U.S.A. (VT, NH) | Fabaceae | Jun 05, 1987 | Flowering Plants | 5 | Endangered | 5 | US | P | Wherever found |
| Astragalus sabulosus | [Cisco] milkvetch | Milkvetch, [Cisco] | Q07A | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Under Review in the Candidate or Petition Process | 6 | US | P | Wherever found |
| Astragalus saurinus | Dinosaur milk-vetch | Milk-vetch, dinosaur | Q07B | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus scaphoides | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZK | P01 | MT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus schmolliae | Chapin Mesa milkvetch | Milkvetch, Chapin Mesa | Q07C | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Candidate | 6 | US | P | Entire |
| Astragalus serenoi sordescens | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07D | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus serpens | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2ZL | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus shevockii | Shevock's milk-vetch | Milk-vetch, Shevock's | Q2XV | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus shultziorum | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2NF | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus siliceus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07F | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus sinuatus | Whited milk-vetch | Milk-vetch, Whited | Q07E | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus solitarius | Weak milk-vetch | Milk-vetch, weak | Q07G | P01 | NV, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Astragalus sterilis | Sterile milk-vetch | Milk-vetch, sterile | Q07H | P01 | ID, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus striatiflorus | Escarpment milk-vetch | Milk-vetch, escarpment | Q2NG | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Astragalus subcinereus basalticus | No common name | No common name | Q2ZM | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus subvestitus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07I | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus tegetarioides | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2S0 | P01 | CA, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Astragalus tener var. ferrisae | Ferris' milk-vetch | milk-vetch, Ferris' | Q3BK | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus tener var. tener | Alkali milk-vetch | milk-vetch, Alkali | Q3KB | P01 | fabaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Astragalus tener var. titi | Coastal dunes milk-vetch | Milk-vetch, coastal dunes | Q07J | P01 | CA; U.S.A. (CA) | Fabaceae | Aug 12, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus tennesseensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07K | P01 | AL, IL, IN, TN; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Astragalus tiehmii | Tiehm's milk-vetch | Milk-vetch, Tiehm's | Q2ZN | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus titanophilus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07L | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus toquimanus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07M | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus tortipes | Sleeping Ute milkvetch | milkvetch, Sleeping Ute | Q3GU | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus traskiae | Trask's milk-vetch | Milk-vetch, Trask's | Q07N | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus tricarinatus | Triple-ribbed milk-vetch | Milk-vetch, triple-ribbed | Q2ZO | P01 | CA; U.S.A. (CA) | Fabaceae | Oct 06, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Astragalus troglodytus | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07O | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus tweedyi | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q262 | P01 | OR, WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus tyghensis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q2S1 | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus uncialis | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07P | P01 | NV, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Astragalus vexilliflexus nubilus | No common name | No common name | Q07Q | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Astragalus webberi | Webber's milk-vetch | Milk-vetch, Webber's | Q2ZP | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Astragalus wetherillii | Wetherill milk-vetch | Milk-vetch, Wetherill | Q07R | P01 | CO, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus wittmannii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q263 | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus woodruffii | [Unnamed] milk-vetch | Milk-vetch, [unnamed] | Q07S | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Astragalus xiphoides | Gladiator milk-vetch | Milk-vetch, gladiator | Q07T | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astragalus yoder-williamsii | Osgood Mountains milk-vetch | Milk-vetch, Osgood Mountains | Q2NH | P01 | ID, NV; | Fabaceae | Aug 13, 1980 | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Astranthium robustum | No common name | No common name | Q07U | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Astrophytum asterias | Star cactus | Cactus, star | Q07V | P01 | TX; U.S.A. (TX), Mexico | Cactaceae | Oct 18, 1993 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| astylis species | notodontid moth | moth, notodontid | I0UD | I01 | notodontidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Ataenius superficialis | Big Pine Key ataenius dung beetle | Dung beetle, Big Pine Key ataenius | I06S | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ataenius woodruffi | Woodruff's ataenius dung beetle | Dung beetle, Woodruff's ataenius | I06T | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ateles geoffroyi frontatus | Spider monkey | Monkey, spider | A01T | V01 | Nicaragua,Costa Rica | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ateles geoffroyl panamensis | Spider monkey | Monkey, spider | A01U | V01 | Panama,Costa Rica | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ateloplus joaquin | Jacalitos shield-backed katydid | Katydid, Jacalitos shield-backed | I0SZ | I01 | Tettigoniidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Ateloplus splendidus | Splendid shield-backed katydid | Katydid, splendid shield-backed | I0T0 | I01 | Tettigoniidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Atelopus varius zeteki | Panamanian golden frog | Frog, Panamanian golden | D006 | V01 | Panama | Atelopodidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Atelothrus transiens | Transient atelothrus ground beetle | Ground beetle, transient atelothrus | I0PA | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Athearnia anthonyi | Anthony's riversnail | Riversnail, Anthony's | G016 | I01 | AL, GA, NC, TN; U.S.A. (TN, GA, AL) | Pleuroceridae | Apr 15, 1994 | Snails | 4 | Endangered | 4 | US | I | Wherever found; Except where listed as Experimental Populations |
| Athearnia anthonyi | Anthony's riversnail | Riversnail, Anthony's | G016 | I02 | AL; U.S.A. (TN, GA, AL) | Pleuroceridae | Jun 14, 2001 | Snails | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Athearnia anthonyi | Anthony's riversnail | Riversnail, Anthony's | G016 | I03 | TN; U.S.A. (TN, GA, AL) | Pleuroceridae | Oct 15, 2007 | Snails | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Athene cunicularia | Burrowing Owl | Owl, Burrowing | B0NC | V01 | Strigidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Athene cunicularia ssp. hypugaea | Western burrowing owl | Owl, western burrowing | B0AR | V01 | CO; | Strigidae | NA | Birds | 1 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Atlantea tulita | Puerto Rico harlequin butterfly | Butterfly, Puerto Rico harlequin | I0VK | I01 | PR; | Nymphalidae | NA | Insects | 4 | Candidate | 4 | US | I | Wherever found |
| Atractelmis wawona | Wawona riffle beetle | Riffle beetle, Wawona | I0C5 | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Atrichornis clamosus | Noisy scrub-bird | Scrub-bird, noisy | B038 | V01 | Australia | Atrichornithidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Atriplex canescens gigantea | No common name | No common name | Q2S2 | P01 | UT; | Chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Atriplex cordulata | Heartscale | Heartscale | Q2ZQ | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex coronata var. notatior | San Jacinto Valley crownscale | Crownscale, San Jacinto Valley | Q2ZR | P01 | CA; U.S.A. (CA) | Chenopodiaceae | Oct 13, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Atriplex coulteri | Coulter's saltbush | saltbush, Coulter's | Q3KY | P01 | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Atriplex depressa | Brittlescale | Brittlescale | Q3IZ | P01 | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Atriplex griffithsii | Griffith's saltbush | Saltbush, Griffith's | Q07W | P01 | AZ, NM; | Chenopodiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Atriplex joaquiniana | Valley spearscale | Spearscale, valley | Q2ZS | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex klebergorum | Kleberg's saltbush | Saltbush, Kleberg's | Q07X | P01 | TX; | Chenopodiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| atriplex minuscula | Lesser saltbrush | saltbrush, Lesser | Q3J6 | P01 | chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Atriplex pacifica | South coast saltbush | Saltbush, south coast | Q3BL | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex parishii | Parrish's brittlescale | Brittlescale, Parrish's | Q2ZT | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex persistens | Sacramento saltbush | saltbush, Sacramento | Q3J0 | P01 | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| atriplex serenana var. davidsonii | Davidson's saltscale | saltscale, Davidson's | Q3K2 | P01 | chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Atriplex tularensis | Bakersfield saltbush | Saltbush, Bakersfield | Q07Y | P01 | CA; Possibly extinct | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex vallicola | Lost Hills saltbush | Saltbush, Lost Hills | Q07Z | P01 | CA; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Atriplex welshii | No common name | No common name | Q080 | P01 | UT; | Chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Atrytone arogos arogos | Eastern beard grass Skipper | Skipper, eastern beard grass | I0OD | I01 | AL, DE, FL, GA, MS, NC, NJ, NY, PA, SC, VA; | Hesperiidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Auerodendron pauciflorum | No common name | No common name | Q2ZU | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Rhamnaceae | Mar 02, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Aulacoplax leptosoma | Pandanus skink | Skink, Pandanus | C028 | V01 | Scincidae | NA | Reptiles | 1 | Not Listed | NA | US | V | Wherever found | |
| Aulacorhynchus huallagae | Yellow-browed toucanet | Toucanet, yellow-browed | B0BO | V01 | Ramphastidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Aureolaria patula | No common name | No common name | Q081 | P01 | AL, GA, KY, TN; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Austrotinodes sp. | Texas austrotinodes caddisfly | Caddisfly, Texas austrotinodes | I0P4 | I01 | TX; | Ecnomidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Automeris louisiana | Louisiana Eye silkmoth | silkmoth, Louisiana Eye | I0X1 | I01 | LA, MS; | Saturniidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Automeris patagoniensis | patagonia eyed silkmoth | No common name | I0UI | I01 | AZ; | saturniidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Avahi laniger (entire genus) | Avahi | Avahi | A00O | V01 | Comoro Islands and Madagascar | Indridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Axis porcinus annamiticus | Indochina hog deer | Deer, Indochina hog | A055 | V01 | Columbia River (Clark, Cowlitz, Pacific, Skamania, and Wahkiakum Counties, WA, and Clatsop, Columbia, and Multnomah Counties, OR); Thailand,Indochina | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Axis porcinus calamianensis | Calamianes (=Philippine) deer | Deer, Calamianes (=Philippine) | A058 | V01 | Entire; Philippines (Calamian Islands) | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Axis porcinus kuhli | Kuhl's (=Bawean) deer | Deer, Kuhl's (=Bawean) | A00T | V01 | Indonesia | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ayenia limitaris | Texas ayenia | Ayenia, Texas | Q2XW | P01 | TX; U.S.A. (TX), Mexico | Sterculiaceae | Aug 24, 1994 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Aythya affinis | Lesser scaup | Scaup, lesser | B0G7 | V01 | Anatidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Aythya innotata | Madagascar pochard | Pochard, Madagascar | B0A2 | V01 | Madagascar | Anatidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Babyrousa babyrussa | Babirusa | Babirusa | A04N | V01 | Entire | Suidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Baccharis plummerae glabrata | Hoover's coyot bush | Bush, Hoover's coyot | Q2XX | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Baccharis vanessae | Encinitas baccharis | Baccharis, Encinitas | Q264 | P01 | CA; U.S.A. (CA) | Asteraceae | Oct 07, 1996 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Bacopa innominata | Mat-forming water-hyssop | Water-hyssop, mat-forming | Q083 | P01 | MD, VA; | Scrophulariaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Bacopa rotundifolia | Chickahominy water-hyssop | Water-hyssop, Chickahominy | Q082 | P01 | VA; | Scrophulariaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Bactrurus hubrichti | Kansas well amphipod | Amphipod, Kansas well | K00V | I01 | KS, MO, OK; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2, 3, 6 | US | I | Wherever found |
| Baeolophus inornatus | Oak Titmouse | Titmouse, Oak | B0MJ | V01 | Paridae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Bahia bigelovii | No common name | No common name | Q084 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Balaena mysticetus | Bowhead whale | Whale, bowhead | A02N | V01 | AK; Oceanic (north latitudes only) | Balaenidae | Jun 02, 1970 | Mammals | NMFS | Endangered | 7 | US/Foreign | V | Wherever found |
| Balaenoptera borealis | Sei whale | Whale, Sei | A02S | V01 | CA; Oceanic | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | 8 | US/Foreign | V | Wherever found |
| Balaenoptera musculus | Blue whale | Whale, blue | A02M | V01 | AK, CA; Oceanic | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | 7, 8 | US/Foreign | V | Wherever found |
| Balaenoptera physalus | Finback whale | Whale, finback | A02O | V01 | AL, CA, GA; Oceanic | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | 4, 8 | US/Foreign | V | Wherever found |
| Balduina atropurpurea | Purpledisk honeycombhead | honeycombhead, Purpledisk | Q085 | P01 | FL, GA, NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| balsamorhiza macrolepis var. macrolepis | Big scale balsamroot | balsamroot, Big scale | Q3K8 | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Balsamorhiza rosea | No common name | No common name | Q086 | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Balsamorhiza sericea | No common name | No common name | Q265 | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Banara vanderbiltii | Palo de ramon | Palo de ramon | Q266 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR), endemic to Puerto Rico. Some individuals has been planted in Florida. | Flacourtiaceae | Jan 14, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Banksula grahami | Graham's harvestman | Harvestman, Graham's | J01L | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Banksula melones | Melones harvestman | Harvestman, Melones | J01M | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Banza nihoa | Nihoa banza conehead katydid | Katydid, Nihoa banza conehead | I07R | I01 | HI; | Tettigoniidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Baptisia arachnifera | Hairy rattleweed | Rattleweed, hairy | Q1TD | P01 | GA; U.S.A. (GA) | Fabaceae | May 27, 1978 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Baptisia calycosa calycosa | No common name | No common name | Q087 | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Baptisia calycosa villosa | Hairy wild indigo | Wild indigo, hairy | Q088 | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Baptisia megacarpa | [Unnamed] wild indigo | Wild indigo, [unnamed] | Q1TE | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Baptisia megacarpa | Apalachicola wild indigo | Wild indigo, Apalachicola | Q089 | P01 | FL, GA; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Baptisia simplicifolia | No common name | No common name | Q3I2 | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Bartonia texana | Texas screwstem | Screwstem, Texas | Q08A | P01 | LA, TX; Texas screwstem has been recorded in nine East Texas counties (Angelina, Hardin, Jasper, Nacogdoches, Newton, Polk, San Augustine, San Jacinto, Tyler) at 21 sites. Five sites occur on US Forest Service lands, four sites occur on National Park Service lands in the Big Thicket National Preserve, and twelve sites occur on private property including one owned by The Nature Conservancy. Plants also have been located in three parishes (Caddo, Jackson, Ouachita) in Louisiana. | Gentianaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2, 4 | US | P | Entire |
| Bartramia longicauda | Upland Sandpiper | Sandpiper, Upland | B0HC | V01 | Scolopacidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Basiphyllaea corallicola | No common name | No common name | Q267 | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| bassariscus astutus | Ringtail | Ringtail | A0IP | V01 | procyonidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Batagur baska | River terrapin | Terrapin, river | C00H | V01 | Malaysia, Indonesia, India, Burma, Bangladesh | Emydidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Batesimalva violacea | Purple gay-mallow | Gay-mallow, purple | Q08B | P01 | TX; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Batrachoseps aridus | Desert slender salamander | Salamander, desert slender | D005 | V01 | CA; U.S.A. (CA) | Plethodontidae | Jun 04, 1973 | Amphibians | 8 | Endangered | 8 | US | V | Wherever found |
| Batrachoseps campi | Inyo Mountains slender salamander | Salamander, Inyo Mountains slender | D017 | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Batrachoseps minor | Lesser slender salamander | Salamander, lesser slender | D04H | V01 | CA; | Plethodontidae | NA | Amphibians | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| batrachoseps nigriventris | Black-bellied slender salamander | salamander, Black-bellied slender | D03K | V01 | plethodontidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Batrachoseps pacificus pacificus | Channel Islands slender salamander | Salamander, Channel Islands slender | D01U | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Batrachoseps regius | Kings River slender salamander | salamander, Kings River slender | D04G | V01 | CA; | Plethodontidae | NA | Amphibians | 8 | Not Listed | 8 | US | V | Wherever found |
| Batrachoseps relictus | Relictual slender salamander | Salamander, relictual slender | D02V | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Batrachoseps robustus | Kern Plateau salamander | Salamander, Kern Plateau | D04F | V01 | CA; | Plethodontidae | NA | Amphibians | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Batrachoseps simatus | Kern Canyon slender salamander | Salamander, Kern Canyon slender | D01A | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Batrachoseps sp. | Breckenridge Mountain slender salamander | Salamander, Breckenridge Mountain slender | D02Q | V01 | CA; Possibly extinct | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Batrachoseps stebbinsi | Techachapi slender salamander | Salamander, Techachapi slender | D01J | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Batrachoseps wrighti | Oregon slender salamander | Salamander, Oregon slender | D038 | V01 | Plethodontidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Batrisodes texanus | Coffin Cave mold beetle | Beetle, Coffin Cave mold | I0I9 | I01 | TX; U.S.A. (TX) | Pselaphidaeae | Sep 16, 1988 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| Batrisodes venyivi | Helotes mold beetle | Beetle, Helotes mold | I0PT | I01 | TX; U.S.A. (TX) | Pselaphidae | Dec 26, 2000 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| Battus zetides | Swallowtail butterfly | Butterfly, swallowtail | I0SG | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Bazzania nudicaulis | No common name | No common name | Q2ZV | P01 | NC; | Lepidoziaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Bebrornis rodericanus | Rodrigues warbler (old world warbler) | Warbler, Rodrigues (old world warbler) | B03J | V01 | Mauritius (Rodrigues Islands) | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bebrornis sechellensis | Seychelles warbler (old world warbler) | Warbler, Seychelles (old world warbler) | B03L | V01 | Indian Ocean-Seychelles Island | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Belocephalus micanopy | Big Pine Key conehead katydid | Katydid, Big Pine Key conehead | I07P | I01 | FL; | Tettigoniidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Belocephalus sleighti | Keys shortwinged conehead katydid | Katydid, Keys shortwinged conehead | I07Q | I01 | FL; | Tettigoniidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Beloneuria georgiana | Georgia beloneurian stonefly | Stonefly, Georgia beloneurian | I0EA | I01 | GA, NC; | Perlidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Beloneuria jamesae | Cheaha beloneurian stonefly | Stonefly, Cheaha beloneurian | I0E8 | I01 | AL; | Perlidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Belostoma saratogae | Saratoga Springs belostoman bug | Bug, Saratoga Springs belostoman | I030 | I01 | CA; | Belostomatidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| bembidion gordoni | (Bembidion gordoni) ground beetle | ground beetle, (Bembidion gordoni) | I0TY | I01 | carabidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| bembidion stillaguamish | (Bembidion stillaguamish) ground beetle | ground beetle, (Bembidion stillaguamish) | I0TZ | I01 | carabidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| bembidion viator | (Bembidion viator) ground beetle | ground beetle, (Bembidion viator) | I0U0 | I01 | carabidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Benitoa occidentalis | Western benitoa | Benitoa, western | Q08C | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Bensoniella oregona | Bensoniella | Bensoniella | Q08D | P01 | CA, OR; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Berberis (=Mahonia) sonnei | Truckee Barberry | Barberry, Truckee | Q1TF | P01 | CA; | Berberidaceae | Dec 06, 1979 | Flowering Plants | 8 | Original Data in Error - Taxonomic Revision | 8 | US | P | Entire |
| Berberis harrisoniana | Kofa barberry | Barberry, Kofa | Q08E | P01 | AZ; | Berberidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Berberis higginsiae | Higgin's barberry | Barberry, Higgin's | Q08F | P01 | CA; | Berberidaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Berberis nervosa mendocinensis | Hardy Creek barberry | Barberry, Hardy Creek | Q2NI | P01 | CA; | Berberidaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Berberis nevinii | Nevin's barberry | Barberry, Nevin's | Q08G | P01 | CA; U.S.A. (CA) | Berberidaceae | Oct 13, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Berberis pinnata ssp. insularis | Island Barberry | Barberry, island | Q08H | P01 | CA; U.S.A. (CA) | Berberidaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Berberis swaseyi | [Unnamed] barberry | Barberry, [unnamed] | Q08I | P01 | TX; | Berberidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Besseya bullii | No common name | No common name | Q268 | P01 | IA, IL, IN, MI, MN, OH, WI; | Scrophulariaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Bettongia gaimardi | Gaimard's rat-kangaroo | Rat-kangaroo, Gaimard's | A04D | V01 | Wherever found | Macropodidae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bettongia lesueur | Lesueur's rat-kangaroo | Rat-kangaroo, Lesueur's | A03J | V01 | Wherever found | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bettongia penicillata | Brush-tailed rat-kangaroo | Rat-kangaroo, brush-tailed | A03I | V01 | Wherever found | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bettongia tropica | Queensland rat-kangaroo | Rat-kangaroo, Queensland | A03L | V01 | Wherever found | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Betula murrayana | [Unnamed] birch | Birch, [unnamed] | Q2ZW | P01 | MI; | Betulaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Betula uber | Virginia round-leaf birch | Birch, Virginia round-leaf | Q1TG | P01 | VA; U.S.A. (VA) | Betulaceae | May 27, 1978 | Flowering Plants | 5 | Threatened | 5 | US | P | Wherever found |
| Bidens amplectens | Ko`oko`olau | Ko`oko`olau | Q3HE | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens bidentoides bidentoides | [Unnamed] bur-marigold | Bur-marigold, [unnamed] | Q3BM | P01 | DE, NJ, NY, PA; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Bidens bidentoides mariana | Maryland bur-marigold | Bur-marigold, Maryland | Q2NJ | P01 | MD; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Bidens campylotheca campylotheca | Campylotheca bidens | Bidens, campylotheca | Q08J | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens campylotheca ssp. campylotheca | Ko`oko`olau | Ko`oko`olau | Q1TJ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens campylotheca ssp. pentamera | Ko`oko`olau | Ko`oko`olau | Q2S3 | P01 | HI; | Asteraceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens campylotheca ssp. waihoiensis | Ko`oko`olau | Ko`oko`olau | Q269 | P01 | HI; | Asteraceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens cervicata | Ko`oko`olau | Ko`oko`olau | Q08K | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens coarctata | Manoa bidens | Bidens, Manoa | Q08L | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens conjuncta | Ko`oko`olau | Ko`oko`olau | Q08M | P01 | HI; | Asteraceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens cuneata | Cuneate bidens | Bidens, cuneate | Q1TH | P01 | HI; | Asteraceae | Feb 17, 1984 | Flowering Plants | 1 | Original Data in Error - Taxonomic Revision | 1 | US | P | Wherever found |
| Bidens degeneri | Ko`oko`olau | Ko`oko`olau | Q08N | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens forbesii | Forbes bidens | Bidens, Forbes | Q1TI | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens graciloides | Maunalua bidens | Bidens, Maunalua | Q08O | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens hawaiensis | Ko`oko`olau | Ko`oko`olau | Q08P | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens hillebrandiana ssp. hillebrandiana | kookoolau | No common name | Q3OA | P01 | HI; | Asteraceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens macrocarpa ovatifolia | Ko`oko`olau | Ko`oko`olau | Q08Q | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens mauiensis | Ko`oko`olau | Ko`oko`olau | Q08R | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens menziesii leptodonta | Ko`oko`olau | Ko`oko`olau | Q08S | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens micrantha caduca | Ko`oko`olau | Ko`oko`olau | Q08T | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens micrantha kaalana | Ko`oko`olau | Ko`oko`olau | Q08U | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens micrantha laciniata | Ko`oko`olau | Ko`oko`olau | Q08V | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens micrantha ssp. ctenophylla | Ko`oko`olau | Ko`oko`olau | Q2XY | P01 | HI; | Asteraceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens micrantha ssp. kalealaha | Ko`oko`olau | Ko`oko`olau | Q1TK | P01 | HI; U.S.A. (HI) | Asteraceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bidens molokaiensis | Ko`oko`olau | Ko`oko`olau | Q2XZ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens obtusiloba | Ko`oko`olau | Ko`oko`olau | Q08W | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens populifolia | Poplar-leaved bidens | Bidens, poplar-leaved | Q1TL | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens pulchella | Ko`oko`olau | Ko`oko`olau | Q08X | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens salicoides | Willow-leaved bidens | Bidens, willow-leaved | Q08Y | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens sandvicensis confusa | Ko`oko`olau | Ko`oko`olau | Q2ZX | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens sandvicensis ssp. sandvicensis | Ko`oko`olau | Ko`oko`olau | Q1TM | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens sandwicensis setosa | Ko`oko`olau | Ko`oko`olau | Q08Z | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens valida | Robust bidens | Bidens, robust | Q090 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bidens wiebkei | Ko`oko`olau | Ko`oko`olau | Q1TN | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Binneya notabilis | Santa Barbara shelled slug | Slug, Santa Barbara shelled | G00A | I01 | CA; | Arionidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Bison bison athabascae | Wood Bison | Bison, wood | A00R | V01 | AK; Entire | Bovidae | Jun 02, 1970 | Mammals | 7 | Threatened | 7 | US/Foreign | V | Wherever found |
| Bison bison bison | Plains bison | Bison, plains | A0HZ | V01 | CO, IA, MT, OK, SD, UT, WY; | Bovidae | NA | Mammals | 6 | Not Listed | 2, 3, 6 | US/Foreign | V | Wherever found |
| Blackburnia insignis | Oahu blackburnia ground beetle | Ground beetle, Oahu blackburnia | I0PB | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Blancosoma scaturgo | No common name | No common name | H003 | I01 | Tingupidae | NA | Millipedes | 6 | Not Listed | NA | US | I | Wherever found | |
| Blarina brevicauda aloga | Martha's Vineyard short-tailed shrew | Shrew, Martha's Vineyard short-tailed | A0E1 | V01 | MA; | Soricidae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Blarina brevicauda compacta | Nantucket short-tailed shrew | Shrew, Nantucket short-tailed | A0E4 | V01 | MA; | Soricidae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Blarina brevicauda shermani | Blarina carolinensis ssp. shermani | Shrew, Sherman's short-tailed | A09K | V01 | FL; | Soricidae | NA | Mammals | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Blarina brevicauda telmalestes | Dismal Swamp short-tailed shrew | Shrew, Dismal Swamp short-tailed | A0DX | V01 | NC, VA; | Soricidae | NA | Mammals | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Blarina hylophaga plumbea | Aransas short-tailed shrew | Shrew, Aransas short-tailed | A0DT | V01 | TX; | Soricidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Blastocerus dichotomus | Marsh deer | Deer, marsh | A00V | V01 | Argentina, Bolivia, Brazil, Paraguay, Uruguay | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Blennosperma bakeri | Sonoma sunshine | Sunshine, Sonoma | Q1TO | P01 | CA; U.S.A. (CA) | Asteraceae | Dec 02, 1991 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Blennosperma nanum robustum | Point Reyes stickyseed | Stickyseed, Point Reyes | Q091 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Bloomeria humilis | Dwarf goldenstar | Goldenstar, dwarf | Q092 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Bobea sandwicensis | `Ahakea | `Ahakea | Q1TP | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Bobea timonioides | `Ahakea | `Ahakea | Q093 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Boechera pinzliae | Boundary Peak rock-cress | Rock-cress, Boundary Peak | Q2X9 | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Boechera pusilla | Fremont County rockcress | Rockcress, Fremont County | Q2N2 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Boerhavia mathisiana | Mathis spiderling | Spiderling, Mathis | Q094 | P01 | TX; | Nyctaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Boloria acrocnema | Uncompahgre fritillary butterfly | Butterfly, Uncompahgre fritillary | I01Q | I01 | CO; U.S.A. (CO) | Nymphalidae | Jun 24, 1991 | Insects | 6 | Endangered | 6 | US | I | Wherever found |
| Boltonia apalachicolensis | Apalachicola doll's daisy | Daisy, Apalachicola doll's | Q3MJ | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Boltonia decurrens | Decurrent false aster | Aster, decurrent false | Q26A | P01 | IL, MO; U.S.A. (MO, IL) | Asteraceae | Nov 14, 1988 | Flowering Plants | 3 | Threatened | 3 | US | P | Wherever found |
| Boltonia montana | Doll's daisy | daisy, Doll's | Q3P5 | P01 | DE, NJ, PA, VA; | Asteraceae | NA | Flowering Plants | 5 | Under Review in the Candidate or Petition Process | 5 | US | P | Wherever found |
| Bolyeria multocarinata | Round Island bolyeria boa | Boa, Round Island bolyeria | C02N | V01 | Indian Ocean-Mauritius | Boidae | Mar 20, 1980 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bombus affinis | Rusty patched bumble bee | Bumble bee, Rusty patched | I0WI | I01 | IA, IL, IN, MA, ME, MN, OH, VA, WI, WV; | Apidae | Mar 21, 2017 | Insects | 3 | Endangered | 3, 5 | US | I | Wherever found |
| Bombus franklini | Franklin's bumblebee | Bumblebee, Franklin's | I0IR | I01 | CA, OR; | Apidae | NA | Insects | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US | I | Wherever found |
| Bombus occidentalis | Western Bumble bee | Bumble bee, Western | I0YM | I01 | AK, AZ, CA, CO, ID, MN, MT, ND, NE, NM, NV, OR, SD, WA, WY; | Apidae | NA | Insects | 1 | Under Review in the Candidate or Petition Process | 1, 2, 3, 6, 7, 8 | US/Foreign | I | Wherever found |
| Bombus terricola | Yellow banded Bumble bee | Bumble bee, Yellow banded | I0YN | I01 | CT, IL, KY, MA, MD, ME, MI, MN, MT, NC, ND, NH, NY, OH, PA, RI, SD, TN, VA, VT, WI, WV; ; The historic distribution of B. terricola included the northeast southward into the higher elevations of the Appalachians, the upper Midwest extending west to the Rocky Mountains, most of southeastern Canada (Cameron, et al., 2011 at 663-64) and northwest into British Columbia (Stephen, 1957 at 81). The historic range of B. terricola included the states of: Maine, New Hampshire, Vermont, Massachusetts, New York, Connecticut, Rhode Island, Pennsylvania, Maryland, West Virginia, Ohio, Virginia, Kentucky, Tennessee, North Carolina, Illinois, Michigan, Wisconsin, Minnesota, Montana, and the Dakotas. The species� historic range also included the Canadian provinces of Nova Scotia, New Foundland, Quebec, Ontario, Saskatchewan, Manitoba, Alberta, and British Columbia (Stephen, 1957 at 81). | Apidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 3, 4, 5, 6 | US/Foreign | I | Wherever found |
| Bonamia grandiflora | Florida bonamia | Bonamia, Florida | Q26B | P01 | FL; U.S.A. (FL); xeric uplands on central Florida sand ridges | Convolvulaceae | Nov 02, 1987 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Bonamia menziesii | No common name | No common name | Q1TQ | P01 | HI; U.S.A. (HI) | Convolvulaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Bonamia ovalifolia | Bigpod bonamia | Bonamia, bigpod | Q2ZY | P01 | TX; | Convolvulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Bos gaurus | Seledang | Seledang | A029 | V01 | Bangladesh,Southeast Asia,India | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bos javanicus | Banteng | Banteng | A00Q | V01 | Southeast Asia | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bos mutus (=grunniens m.) | Wild yak | Yak, wild | A02U | V01 | China (Tibet),India | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bos sauveli | Kouprey | Kouprey | A01G | V01 | Vietnam,Thailand,Laos,Cambodia | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Botaurus lentiginosus | American bittern | bittern, American | B0F3 | V01 | ardeidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Bothriochloa exaristata | No common name | No common name | Q26C | P01 | LA, TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Botrychium ascendens | Trianglelobe moonwort | Moonwort, Trianglelobe | S01Q | P01 | ID, OR; | Ophioglossaceae | Sep 26, 1994 | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Botrychium crenulatum | No common name | No common name | S01E | P01 | AZ, CA, MT, OR, UT; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1, 2, 6, 8 | US | P | Wherever found |
| Botrychium gallicomontanum | Prairie moonwort | Moonwort, Prairie | S023 | P01 | MI; Canada (Ont.) | Ophioglossaceae | Jun 09, 1993 | Ferns and Allies | 3 | Not Listed | 3 | US/Foreign | P | Wherever found |
| Botrychium lineare | Slender Moonwort | Moonwort, slender | S024 | P01 | CO, WA; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Botrychium mormo | No common name | No common name | S025 | P01 | MI, MN, WI; | Ophioglossaceae | NA | Ferns and Allies | 3 | Not Listed | 3 | US | P | Wherever found |
| Botrychium pallidum | No common name | No common name | S01R | P01 | UT; | Ophioglossaceae | NA | Ferns and Allies | 6 | Not Listed | 6 | US | P | Wherever found |
| Botrychium paradoxum | No common name | No common name | S01F | P01 | MT, UT; | Ophioglossaceae | NA | Ferns and Allies | 6 | Not Listed | 6 | US/Foreign | P | Wherever found |
| Botrychium pedunculosum | Stalked moonwort | Moonwort, Stalked | S01S | P01 | OR; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Botrychium pumicola nealleyi | Crater Lake grap fern | Grap fern, Crater Lake | S002 | P01 | CA, OR; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Botrychium subbifoliatum | Makou | Makou | S003 | P01 | HI; Possibly extinct,last observed in 1940 | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Bouchardina robisoni | Bayou Bodcau crayfish | crayfish, Bayou Bodcau | K064 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Bowdleria punctata wilsoni | Codfish Island fernbird | Fernbird, Codfish Island | B0DA | V01 | Sylviidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Brachionidium ciliolatum | Makou | Makou | Q097 | P01 | PR, VI; Possibly extinct | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Brachycercus flavus | Yellow brachycercus mayfly | Mayfly, yellow brachycercus | I0A1 | I01 | LA; Possibly extinct,not reported since 1965 | Caenidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Brachycercus tuberculatus | No common name | No common name | I0V4 | I01 | Caenidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Brachylagus idahoensis | Columbia Basin Pygmy Rabbit | Rabbit, Columbia Basin Pygmy | A0GG | V01 | WA; U.S.A. (WA - Douglas, Grant, Lincoln, Adams, Benton Counties) | Leporidae | Nov 30, 2001 | Mammals | 1 | Endangered | 1 | US | V | U.S.A. (WA-Douglas, Grant, Lincoln, Adams, Benton Counties) |
| Brachylagus idahoensis | Columbia Basin Pygmy Rabbit | Rabbit, Columbia Basin Pygmy | A0GG | V02 | Leporidae | NA | Mammals | 1 | Not Listed | NA | US | V | Wherever found | |
| Brachylophus fasciatus | Fiji banded iguana | Iguana, Fiji banded | C02P | V01 | Pacific-Tonga, Fiji | Iguanidae | Mar 20, 1980 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Brachylophus vitiensis | Fiji crested iguana | Iguana, Fiji crested | C02Q | V01 | Pacific-Fiji | Iguanidae | Mar 20, 1980 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Brachymenium andersonii | Anderson's brachymenium | Brachymenium, Anderson's | Q302 | P01 | NC; Possibly extinct | Bryaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Brachyramphus brevirostris | Kittlitz's murrelet | Murrelet, Kittlitz's | B0AP | V01 | AK; | Alcidae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Brachyramphus marmoratus | Marbled murrelet | Murrelet, marbled | B08C | V01 | CA, OR, WA; U.S.A. (CA, OR, WA) | Alcidae | Oct 01, 1992 | Birds | 1 | Threatened | 1, 8 | US | V | U.S.A. (CA, OR, WA) |
| Brachyramphus marmoratus | Marbled murrelet | Murrelet, marbled | B08C | V02 | Alcidae | NA | Birds | 7 | Not Listed | NA | US/Foreign | V | Entire, except U.S.A. (CA, OR, WA) | |
| Brachyteles arachnoides | Woolly spider monkey | Monkey, woolly spider | A01W | V01 | Brazil | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| bradycellus fenderi | (Bradycellus fenderi) ground beetle | ground beetle, (Bradycellus fenderi) | I0U1 | I01 | carabidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Bradypus pygmaeus | Pygmy Three-toed Sloth | Sloth, Pygmy Three-toed | A0KV | V01 | Panama | Bradypodidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found |
| Bradypus torquatus | Brazilian three-toed sloth | Sloth, Brazilian three-toed | A02C | V01 | Brazil | Bradypodidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Branchinecta conservatio | Conservancy fairy shrimp | Fairy shrimp, Conservancy | K03D | I01 | CA; U.S.A. (CA) | Branchinectidae | Sep 19, 1994 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Branchinecta longiantenna | Longhorn fairy shrimp | Fairy shrimp, longhorn | K03E | I01 | CA; U.S.A. (CA) | Branchinectidae | Sep 19, 1994 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Branchinecta lynchi | Vernal pool fairy shrimp | Fairy shrimp, vernal pool | K03G | I01 | CA, OR; U.S.A. (OR, CA) | Branchinectidae | Sep 19, 1994 | Crustaceans | 8 | Threatened | 1, 8 | US | I | Wherever found |
| Branchinecta mesovallensis | Midvalley Fairy Shrimp | Shrimp, Midvalley Fairy | K050 | I01 | Branchinectidae | NA | Crustaceans | 1 | Not Listed | NA | US | I | Wherever found | |
| Branchinecta sandiegonensis | San Diego fairy shrimp | Fairy shrimp, San Diego | K049 | I01 | CA; U.S.A. (CA) | Branchinectidae | Feb 03, 1997 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Branchinella lithaca | Stone Mountain fairy shrimp | Fairy shrimp, Stone Mountain | K04L | I01 | GA; | Thamnocephalidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Branta (=Nesochen) sandvicensis | Hawaiian goose | Goose, Hawaiian | B00C | V01 | HI; U.S.A. (HI) | Anatidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Branta canadensis leucopareia | Aleutian Canada goose | Goose, Aleutian Canada | B00B | V01 | AK, CA, OR, WA; | Anatidae | Mar 11, 1967 | Birds | 7 | Recovery | 1, 7, 8 | US/Foreign | V | Wherever found |
| Brassia caudata | No common name | No common name | Q26D | P01 | FL; Central America,Mexico,South America,West Indies | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Braya humilis leiocarpa | No common name | No common name | Q26E | P01 | MI, VT; | Brassicaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Braya humilis ventosa | Alpine braya | Braya, alpine | Q098 | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Brazoria pulcherrima | Centerville brazos-mint | Brazos-mint, Centerville | Q099 | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brennania belkini | Belkin's dune tabanid fly | Fly, Belkin's dune tabanid | I074 | I01 | CA; | Tabanidae | NA | Insects | 1 | Not Listed | 8 | US/Foreign | I | Wherever found |
| Brickellia brachyphylla montanus | Hinckley's bricklebush | Bricklebush, Hinckley's | Q313 | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Brickellia brachyphylla terlinguensis | Terlingua bricklebush | Bricklebush, Terlingua | Q09A | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brickellia cordifolia | Flyr's brickell-bush | Brickell-bush, Flyr's | Q09B | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Brickellia dentata | No common name | No common name | Q09C | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brickellia knappiana | Knapp's brickellia | Brickellia, Knapp's | Q09D | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Brickellia leptophylla | No common name | No common name | Q26F | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brickellia mosieri | Florida brickell-bush | Brickell-bush, Florida | Q09E | P01 | FL; | Asteraceae | Oct 06, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Brickellia viejensis | Sierra Vieja brickellia | Brickellia, Sierra Vieja | Q09F | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brighamia insignis | Olulu | Olulu | Q1TR | P01 | HI; U.S.A. (HI) | Campanulaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Brighamia rockii | Pua `ala | Pua `ala | Q1TS | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Brodiaea coronaria rosea | Indian Valley brodiaea | Brodiaea, Indian Valley | Q09G | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Brodiaea filifolia | Thread-leaved brodiaea | Brodiaea, thread-leaved | Q09H | P01 | CA; U.S.A. (CA) | Liliaceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Brodiaea insignis | Kaweah brodiaea | Brodiaea, Kaweah | Q2S5 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Brodiaea kinkiensis | San Clemente Island brodiaea | Brodiaea, San Clemente Island | Q2NM | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Brodiaea orcuttii | Orcutt's brodiaea | Brodiaea, Orcutt's | Q09I | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Brodiaea pallida | Chinese Camp brodiaea | Brodiaea, Chinese Camp | Q09J | P01 | CA; U.S.A. (CA) | Liliaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Bromus arizonicus | Arizona brome | Brome, Arizona | Q3J2 | P01 | Poaceae | NA | Flowering Plants | 1 | Not Listed | NA | US/Foreign | P | Wherever found | |
| Bromus texensis | No common name | No common name | Q09K | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Brongniartia minutifolia | Little-leaf brongniartia | Brongniartia, little-leaf | Q09L | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Brotogeris pyrrhoptera | grey-cheeked parakeet | Parakeet, grey-cheeked | B0GK | V01 | Psittacidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Browallia sp. | Sp. nov. ined. browallia | Browallia, sp. nov. ined. | Q3BQ | P01 | AZ; | Solanaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Brunfelsia portoricensis | No common name | No common name | Q09M | P01 | PR, VI; | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Bryania bipunctata | Nihoa two-spotted asteriid fly | Asteriid fly, Nihoa two-spotted | I027 | I01 | HI; | Asteriidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Brychius hungerfordi | Hungerford's crawling water Beetle | Beetle, Hungerford's crawling water | I02B | I01 | MI; U.S.A. (MI), Canada | Halipilidae | Mar 07, 1994 | Insects | 3 | Endangered | 3 | US/Foreign | I | Wherever found |
| Bryocrumia vivicolor | Gorge moss | Moss, gorge | Q303 | P01 | NC; | Hypnaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Bubalus depressicornis | Lowland anoa | Anoa, lowland | A00G | V01 | Indonesia | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bubalus mindorensis | Tamaraw | Tamaraw | A03O | V01 | Philippines | Bovidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bubalus quarlesi | Mountain anoa | Anoa, mountain | A00H | V01 | Entire | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Buceros (=Rhinoplax) vigil | Helmeted hornbill | Hornbill, helmeted | B055 | V01 | Thailand, Malaysia | Buceratidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Buckleya distichophylla | Piratebush | Piratebush | Q09N | P01 | NC, VA; | Santalaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Buellia sharpiana | Evelyn''s buttons | buttons,Evelyn''s | U00X | P01 | NC; | Caliciaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| bufo alvarius | Colorado River toad | toad, Colorado River | D03P | V01 | bufonidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Bufo boreas | Western toad | Toad, Western | D03T | V01 | Bufonidae | NA | Amphibians | 1 | Not Listed | NA | US | V | Wherever found | |
| Bufo exsul | Black toad | Toad, black | D01P | V01 | CA; | Bufonidae | Mar 11, 1967 | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Bufo hemiophrys baxteri | Wyoming Toad | Toad, Wyoming | D01R | V01 | WY; U.S.A. (WY) | Bufonidae | Jan 17, 1984 | Amphibians | 6 | Endangered | 6 | US | V | Wherever found |
| Bufo houstonensis | Houston toad | Toad, Houston | D004 | V01 | TX; U.S.A. (TX) | Bufonidae | Oct 13, 1970 | Amphibians | 2 | Endangered | 2 | US | V | Wherever found |
| Bufo microscaphus microscaphus | Arizona toad | Toad, Arizona | D025 | V01 | AZ, CA, NM, NV, OR, UT; | Bufonidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 1, 2, 6, 8 | US/Foreign | V | Wherever found |
| Bufo nelsoni | Amargosa toad | Toad, Amargosa | D00L | V01 | NV; | Bufonidae | NA | Amphibians | 8 | Not Listed | 8 | US | V | Wherever found |
| Bufo periglenes | Monte Verde golden toad | Toad, Monte Verde golden | D00A | V01 | Costa Rica | Bufonidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bufo retiformis | Sonoran green toad | Toad, Sonoran green | D01Q | V01 | AZ; | Bufonidae | NA | Amphibians | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Bufo superciliaris | Cameroon toad | Toad, Cameroon | D009 | V01 | Equatorial Africa | Bufonidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Bulbophyllum guamense | Cebello halumtano | halumtano, Cebello | Q3OU | P01 | GU, MP; | Orchidaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Burramys parvus | Mountain pygmy possum | Possum, mountain pygmy | A03F | V01 | Wherever found | Phalangeridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Buteo brachyurus | short-tailed hawk | hawk, short-tailed | B0FQ | V01 | Accipitridae | NA | Birds | 4 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Buteo brachyurus | short-tailed hawk | hawk, short-tailed | B0FQ | V02 | FL; | Accipitridae | NA | Birds | 4 | Not Listed | 4 | US | V | Florida population |
| Buteo galapagoensis | Galapagos hawk | Hawk, Galapagos | B01T | V01 | Ecuador (Galapagos Islands) | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| buteo lagopus | Rough-legged hawk | hawk, Rough-legged | B0E4 | V01 | accipitridae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| buteo lineatus | Red-shouldered hawk | hawk, Red-shouldered | B0E5 | V01 | accipitridae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Buteo nitidus maximus | Northern gray hawk | Hawk, northern gray | B08H | V01 | AZ, NM, TX; | Accipitridae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Buteo platypterus brunnescens | Puerto Rican broad-winged hawk | Hawk, Puerto Rican broad-winged | B06Y | V01 | PR; ; U.S.A. (PR) | Accipitridae | Sep 09, 1994 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Buteo regalis | Ferruginous hawk | Hawk, ferruginous | B06X | V01 | CO; | Accipitridae | NA | Birds | 6 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Buteo ridgwayi | Ridgeway's hawk | hawk, Ridgeway's | B0H1 | V01 | Hispaniola (Dominican Republic and Haiti) | Accipitridae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found |
| Buteo solitarius | Hawaiian (='lo) Hawk | Hawk, Hawaiian (='lo) | B00D | V01 | HI; U.S.A. (HI) | Accipitridae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Buteo swainsoni | Swainson's hawk | Hawk, Swainson's | B070 | V01 | CO; Canada,Mexico,Central and South America | Accipitridae | NA | Birds | 3 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Buxus vahlii | Vahl's boxwood | Boxwood, Vahl's | Q26G | P01 | PR, VI; Extirpated from St.Croix, VI; Puerto Rico and St Croix; U.S.A. (VI, PR) | Buxaceae | Aug 13, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Byrsonima lucida | Maricao cimarron | Maricao cimarron | Q304 | P01 | FL, PR, VI; | Malpighiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Byrsonima spicata | Maricao cimarron | Maricao cimarron | Q305 | P01 | PR, VI; | Malpighiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cacajao spp. | Uakari (all species) | Uakari (all species) | A02K | V01 | Peru, Brazil, Ecuador, Colombia, Venezuela | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cacatua alba | White cockatoo | Cockatoo, white | B0GQ | V01 | Psittacidae | Jun 24, 2014 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found | |
| Cacatua haematuropygia | Philippine cockatoo | Cockatoo, Philippine | B0GN | V01 | Psittacidae | Jun 24, 2014 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Cacatua moluccensis | Salmon-crested cockatoo | Cockatoo, salmon-crested | B0BS | V01 | Seram, Haruku, Saparua, and Ambon, Indonesia | Cacatuidae | Jun 27, 2011 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cacatua sulphurea | Yellow-crested cockatoo | Cockatoo, yellow-crested | B0GS | V01 | Psittacidae | Jun 24, 2014 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Caconemobius howarthi | Howarth's cave cricket | Cricket, Howarth's cave | I05H | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Caconemobius schauinslandi | Schauinsland's bush cricket | Cricket, Schauinsland's bush | I05P | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Caconemobius varius | Kaumana Cave cricket | Cricket, Kaumana Cave | I05J | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Caecidotea acuticarpa | Unnamed isopod | Isopod, unnamed | K04V | I01 | Asellidae | NA | Crustaceans | NA | Not Listed | NA | I | Wherever found | ||
| Caecidotea barri | Clifton Cave isopod | Isopod, Clifton Cave | K02B | I01 | KY; | Asellidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Caecidotea cannula | No common name | No common name | K07O | I01 | WV; | Asellidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Caecidotea cannulus | [Unnamed] isopod | Isopod, [unnamed] | K02O | I01 | MD, WV; | Asellidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Caecidotea carolinensis | Bennets Mill Cave water slater | Water slater, Bennets Mill Cave | K04K | I01 | NC; | Asellidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Caecidotea filicispeluncae | [Unnamed] isopod | Isopod, [unnamed] | K02P | I01 | OH; | Asellidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Caecidotea franzi | Franz's isopod | Isopod, Franz's | K034 | I01 | MD, PA; | Asellidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Caecidotea macropropoda | Bat Cave isopod | Isopod, Bat Cave | K02A | I01 | OK; | Asellidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Caecidotea metcalfi | No common name | No common name | K05X | I01 | Asellidae | NA | Crustaceans | 6 | Not Listed | NA | US | I | Wherever found | |
| Caecidotea nickajackensis | Nickajack Cave isopod | Isopod, Nickajack Cave | K02D | I01 | TN; | Asellidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| caecidotea reddelli | (Caecidotea reddelli) isopod | isopod, (Caecidotea reddelli) | K05I | I01 | asellidae | NA | Crustaceans | 6 | Not Listed | NA | US | I | Wherever found | |
| Caecidotea simonini | [Unnamed] isopod | Isopod, [unnamed] | K02Q | I01 | WV; | Asellidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Caecidotea sinuncus | [Unnamed] isopod | Isopod, [unnamed] | K02R | I01 | WV; | Asellidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Caecidotea tomalensis | [Unnamed] isopod | Isopod, [unnamed] | K03I | I01 | CA; | Asellidae | NA | Crustaceans | 1 | Not Listed | 8 | US | I | Wherever found |
| Caecidotea tridentata | No common name | No common name | K05Y | I01 | Asellidae | NA | Crustaceans | 6 | Not Listed | NA | US | I | Wherever found | |
| Caesalpinia brachycarpa | Broad-pod rushpea | Rushpea, broad-pod | Q09R | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Caesalpinia culebrae | Amarillo mato | Mato, amarillo | Q09S | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Caesalpinia drummondii | No common name | No common name | Q09T | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Caesalpinia monensis | Negro mato | Mato, negro | Q09V | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Caesalpinia portoricensis | Braun mato | Mato, braun | Q09W | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Caiman crocodilus apaporiensis | Apaporis River caiman | Caiman, Apaporis River | C00X | V01 | Colombia | Alligatoridae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Caiman crocodilus crocodilus | Common caiman | Caiman, common | C069 | V01 | Venezuela, Suriname, Peru, Guyana, French Guiana, Ecuador, Colombia, Brazil, Bolivia | Alligatoridae | May 04, 2000 | Reptiles | Foreign | Similarity of Appearance to a Threatened Taxon | NA | Foreign | V | Wherever found |
| Caiman crocodilus fuscus (includes Caiman crocodilus chiapasius) | Brown Caiman | Caiman, brown | C068 | V01 | Venezuela, Peru, Mexico, Ecuador, Central America, Colombia | Alligatoridae | May 04, 2000 | Reptiles | Foreign | Similarity of Appearance to a Threatened Taxon | NA | Foreign | V | Wherever found |
| Caiman latirostris | Broad-snouted caiman | Caiman, broad-snouted | C00Z | V02 | Argentina | Alligatoridae | Jun 14, 1976 | Reptiles | Foreign | Threatened | NA | Foreign | V | Argentina DPS |
| Caiman latirostris | Broad-snouted caiman | Caiman, broad-snouted | C00Z | V03 | Bolivia, Brazil, Paraguay, Uruguay | Alligatoridae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Bolivia, Brazil, Paraguay, and Uruguay |
| Caiman yacare | Yacare Caiman | Caiman, Yacare | C004 | V01 | Paraguay, Brazil, Bolivia, Argentina | Alligatoridae | Jun 02, 1970 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cairina scutulata | White-winged wood duck | Duck, white-winged wood | B01D | V01 | Thailand, Myanmar (Burma), Indonesia (Sumatra), India | Anatidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Calamagrostis cainii | Cain's reedgrass | Reedgrass, Cain's | Q09X | P01 | NC; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calamagrostis crassiglumis | Thurber's reedgrass | Reedgrass, Thurber's | Q09Y | P01 | AK, CA, WA; Canada (B.C.) | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 7, 8 | US/Foreign | P | Wherever found |
| Calamagrostis expansa | Maui reedgrass | Reedgrass, Maui | Q306 | P01 | HI; ; Currently, Calamagrostis expansa is found on the islands of Maui and Hawaii, in wet forest, open bogs, and bog margins (HBMP 2008). | Poaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Calamagrostis foliosa | Leafy reedgrass | Reedgrass, leafy | Q09Z | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calamagrostis hillebrandii | Hillegrand's reedgrass | Reedgrass, Hillegrand's | Q3HF | P01 | HI; | Poaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Calamagrostis inexpansa novae-angliae | Northern (=New England) reedgrass | Reedgrass, northern (=New England) | Q3HW | P01 | ME, NH, VT; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Calamagrostis koelerioides | Dense reedgrass | Reedgrass, dense | Q26H | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calamagrostis nubila | [Unnamed] reedgrass | Reedgrass, [unnamed] | Q2Y0 | P01 | NH; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Calamagrostis perplexa | Wood reedgrass | Reedgrass, wood | Q0A0 | P01 | NY; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Calamagrostis porteri | Porter's reedgrass | Reedgrass, Porter's | Q0A1 | P01 | KY, MD, NC, NY, PA, TN, VA, WV; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Calamagrostis porteri insperata | Ofer Hollow reedgrass | Reedgrass, Ofer Hollow | Q0A2 | P01 | AR, IL, KY, MO, OH; | Poaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Calamagrostis tweedyi | [Unnamed] reedgrass | Reedgrass, [unnamed] | Q0A3 | P01 | ID, MT, WA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Calamovilfa arcuata | Cumberland sandreed | sandreed, Cumberland | Q0A7 | P01 | AR, OK, TN; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Entire |
| Calamovilfa brevipilis | [Unnamed] sand grass | Sand grass, [unnamed] | Q0A8 | P01 | DE, NC, NJ, SC, VA; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Calamovilfa brevipilis calvipes | [Unnamed] sand grass | Sand grass, [unnamed] | Q26I | P01 | VA; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Calamovilfa curtissii | [Unnamed] sand grass | Sand grass, [unnamed] | Q0A9 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calcarius mccownii | McCown's Longspur | Longspur, McCown's | B0HB | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Calcina minor | Edgewood blind harvestman | Harvestman, Edgewood blind | J00C | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Calicina diminua | Marin blind harvestman | Harvestman, Marin blind | J01G | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Calicina jungi | Silver Creek blind harvestman | Harvestman, Silver Creek blind | J01H | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Calidris canutus rufa | Red knot | Knot, red | B0DM | V01 | AL, AR, CT, DE, FL, GA, IL, IN, KS, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TX, VA, WI, WV; The rufa red knot migrates annually between its breeding grounds in the Canadian Arctic and several wintering regions, including the southeast U.S., the northwest Gulf of Mexico, northern Brazil and Tierra del Fuego at the southern tip of South America. During both the northbound (spring) and southbound (fall) migrations, groups of a few individuals to thousands of rufa red knots can be found anywhere along the coastal and inland U.S. migration corridors from Argentina to Canada. In the spring, key staging and stopover areas include Patagonia, Argentina; eastern and northern Brazil; the southeast U.S.; the Virginia barrier islands; and Delaware Bay. In the fall, key migration stopovers include Hudson Bay, James Bay, the St. Lawrence River, the Mingan Archipelago, and the Bay of Fundy in Canada; the Massachusetts and New Jersey coasts; the Altamaha River in Georgia; the Caribbean; and the northern coast of South America from Brazil to Guyana. | Scolopacidae | Jan 12, 2015 | Birds | 5 | Threatened | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Calidris canutus ssp. roselaari | red knot | Knot, red | B0G6 | V01 | Scolopacidae | NA | Birds | 7 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Calidris subruficollis | Buff-breasted Sandpiper | Sandpiper Buff-breasted | B0JS | V01 | Scolopacidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Callaeas cinerea | Kokako (wattlebird) | Kokako (wattlebird) | B020 | V01 | New Zealand | Callaeidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Calliandra biflora | Two-flowered stick-pea | Stick-pea, two-flowered | Q0AA | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Calliandra locoensis | No common name | No common name | Q3HG | P01 | PR, VI; | Mimosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calliasmata pholidota | Anchialine pool Shrimp | Shrimp, anchialine pool | K039 | I01 | HI; | Alpheidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Callicarpa ampla | Capa rosa | Capa rosa | Q26J | P01 | PR; El Yunque National Forest; U.S.A. (PR) | Verbenaceae | Apr 22, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Callimico goeldii | Goeldi's marmoset | Marmoset, Goeldi's | A01Q | V01 | Entire | Callithricidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Calliptropsis nootkatensis | Yellow cedar | cedar, Yellow | R00O | P01 | AK, CA, OR, WA; | Cupressaceae | NA | Conifers and Cycads | 7 | Under Review in the Candidate or Petition Process | 1, 7, 8 | US/Foreign | P | Wherever found |
| Callirhoe bushii | [Unnamed] poppy-mallow | Poppy-mallow, [unnamed] | Q0AB | P01 | AR, IA, KS, MO, OK; | Malvaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4, 6 | US | P | Wherever found |
| Callirhoe scabriuscula | Texas poppy-mallow | Poppy-mallow, Texas | Q1TT | P01 | TX; U.S.A. (TX) | Malvaceae | Jan 13, 1981 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Callithrix aurita (=jacchus a.) | White-eared (=buffy tufted-ear) marmoset | Marmoset, white-eared (=buffy tufted-ear) | A0FL | V01 | Entire | Callithricidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Callithrix flaviceps | Buff-headed marmoset | Marmoset, buff-headed | A0A2 | V01 | Entire | Callithricidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Callitriche marginata | winged water-starwort | water-starwort, winged | Q3O9 | P01 | Plantaginaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Callitropsis nevadensis | Paiute cypress | Cypress, Paiute | R007 | P01 | CA; | Cupressaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Callitropsis stephensonii | Cuyamaca cypress | Cypress, Cuyamaca | R001 | P01 | CA; | Cupressaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Callophrys irus irus, C. i. hadros, C. i. arsace | Frosted Elfin | Elfin, Frosted | I0W3 | I01 | AL, AR, CT, DE, FL, GA, IN, KY, LA, MA, MD, MI, NC, NH, NJ, NY, OH, PA, RI, SC, TN, TX, VA, VT, WI, WV; The distribution of the frosted elfin once extended from southern Ontario and the northeastern United States, south to Florida, and west to Texas and Wisconsin (Allen 1997, p. 93; Opler and Krizek 1984, p. 100). The frosted elfin has a wide range (25 states) in North America. However, the species is likely extirpated from Ontario, Canada, and the District of Columbia, Georgia, Illinois, and Vermont due to loss of host plants as a result of incompatible vegetation management, loss of frosted elfin populations and habitat from catastrophic fire, and residential development. | Lycaenidae | NA | Insects | 5 | Not Listed | 2, 3, 4, 5 | US | I | Wherever found |
| Callophrys mossii bayensis | San Bruno elfin butterfly | Butterfly, San Bruno elfin | I00Q | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| calochortus catalinae | Catalina mariposa lily | lily, Catalina mariposa | Q3JG | P01 | liliaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Calochortus clavatus avius | Pleasant Valley mariposa lily | Mariposa lily, Pleasant Valley | Q2NN | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus clavatus gracilis | Slender mariposa lily | Mariposa lily, slender | Q3BR | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus clavatus recurvifolius | Arroyo de la Cruz mariposa lily | Mariposa lily, Arroyo de la Cruz | Q0AC | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus coxii | Cox's mariposa lily | Mariposa lily, Cox's | Q307 | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus dunnii | Dunn's mariposa lily | Mariposa lily, Dunn's | Q0AD | P01 | CA; Mexico (Baja California) | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Calochortus excavatus | Inyo mariposa lily | Mariposa lily, Inyo | Q2S6 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus greenei | Greene's mariposa lily | Mariposa lily, Greene's | Q0AE | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Calochortus howellii | Howell's mariposa lily | Mariposa lily, Howell's | Q2NO | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus indecorus | [Unnamed] mariposa lily | Mariposa lily, [unnamed] | Q0AF | P01 | OR; Possibly extinct | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus longebarbatus longebarbatus | Long-haired star-tulip | Star-tulip, long-haired | Q0AG | P01 | WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus longebarbatus peckii | Long-bearded, Peck's mariposa | Mariposa, long-bearded, Peck's | Q0AH | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus monanthus | Shasta River mariposa lily | Mariposa lily, Shasta River | Q0AI | P01 | CA; Possibly extinct | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus nitidus | No common name | No common name | Q0AJ | P01 | ID, WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus obispoensis | San Luis mariposa | Mariposa, San Luis | Q0AK | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus palmeri munzii | Munz's mariposa lily | Mariposa lily, Munz's | Q3BS | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus palmeri palmeri | Palmer's mariposa lily | Mariposa lily, Palmer's | Q3BT | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus persistens | Siskiyou Mariposa lily | Mariposa lily, Siskiyou | Q0AL | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 8 | Not Listed | 1, 8 | US | P | Wherever found |
| Calochortus plummerae | Plummer's mariposa lily | Mariposa lily, Plummer's | Q3BU | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| calochortus pulchellus | Recurved larkspur | larkspur, Recurved | Q3K5 | P01 | liliaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Calochortus raichei | The Cedars globe-lily | Globe-lily, The Cedars | Q308 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus simulans | Mariposa lily | Mariposa lily | Q2Y1 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus striatus | Alkali mariposa lily | Mariposa lily, alkali | Q0AM | P01 | CA, NV; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus tiburonensis | Tiburon mariposa lily | Mariposa lily, Tiburon | Q1TU | P01 | CA; U.S.A. (CA) | Liliaceae | Feb 03, 1995 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Calochortus umpquaensis | Umpqua mariposa Lily | Lily, Umpqua mariposa | Q309 | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Calochortus venustus sanguineus | Mariposa lily | Mariposa lily | Q26K | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus weedii intermedius | Foothill mariposa lily | Mariposa lily, foothill | Q3BV | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus weedii vestus | No common name | No common name | Q3BW | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calochortus westonii | Shirley Meadows mariposa lily | Mariposa lily, Shirley Meadows | Q0AN | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Caloenas nicobarica pelewensis | Palau Nicobar pigeon | Pigeon, Palau Nicobar | B06K | V01 | Caroline Islands | Columbidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found |
| Calopogon multiflorus | Manyflower grasspink | Grasspink, manyflower | Q3IV | P01 | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Calopogon oklahomensis | Oklahoma grasspink | grasspink, Oklahoma | Q3MO | P01 | AR, IL, LA, MO, MS, OK, TX, WI; | Orchidaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Caloprymnus campestris | Desert (=plain) rat-kangaroo | Rat-kangaroo, desert (=plain) | A03K | V01 | Wherever found | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Calycadenia fremontii | Fremont's rosinweed | Rosinweed, Fremont's | Q0AO | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calycadenia hooveri | Hoover's rosinweed | Rosinweed, Hoover's | Q2S7 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calydorea coelestina | Bartram's ixia | Ixia, Bartram's | Q1M8 | P01 | FL; | Iridaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calypte costae | Costa's Hummingbird | Hummingbird, Costa's | B0JE | V01 | Trochilidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Calyptranthes estremerae | No common name | No common name | Q3BX | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calyptranthes luquillensis | No common name | No common name | Q0AP | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calyptranthes peduncularis | No common name | No common name | Q0AQ | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calyptranthes thomasiana | No common name | No common name | Q26L | P01 | VI; U.S. Virgin Islands and British Virgin Islands | Myrtaceae | Feb 18, 1994 | Flowering Plants | 4 | Endangered | 4 | US/Foreign | P | Wherever found |
| Calyptranthes triflorum | No common name | No common name | Q0AR | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Calyptridium pulchellum | Mariposa pussypaws | Pussypaws, Mariposa | Q0AS | P01 | CA; U.S.A. (CA) | Portulacaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Calyptronoma rivalis | Palma de manaca | Manaca, palma de | Q26M | P01 | PR; Puerto Rico and Hispaniola (Dominican Republic); U.S.A. (PR) | Arecaceae | Feb 06, 1990 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Calystegia atriplicifolia buttensis | Butte County morning-glory | Morning-glory, Butte County | Q30A | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calystegia collina oxyphylla | Mt. Saint Helena morning-glory | Morning-glory, Mt. Saint Helena | Q2NP | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calystegia collina venusta | South Coast Range morning-glory | Morning-glory, South Coast Range | Q2NQ | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calystegia macrostegia amplissima | Island morning-glory | Morning-glory, island | Q2NR | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calystegia peirsonii | Peirson's morning-glory | Morning-glory, Peirson's | Q0AT | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Calystegia stebbinsii | Stebbins' morning-glory | Morning-glory, Stebbins' | Q0AU | P01 | CA; U.S.A. (CA) | Convolvulaceae | Oct 18, 1996 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Calystegia subacaulis episcopalis | Cambria morning-glory | Morning-glory, Cambria | Q2NS | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camarhynchus pauper | Floreana tree-Finch | Tree-Finch, Floreana | B0B6 | V01 | Emberizidae | Aug 26, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Camassia cusickii | No common name | No common name | Q0AV | P01 | ID, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Camassia howellii | No common name | No common name | Q30B | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Camassia leichtlinii leichtlinii | Leichtlin camassia | Camassia, Leichtlin | Q26N | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cambarellus blacki | Cypress crayfish | crayfish, Cypress | K066 | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarellus diminutus | Least crayfish | crayfish, Least | K067 | I01 | AL, MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarellus lesliei | Angular Dwarf crayfish | crayfish, Angular Dwarf | K068 | I01 | AL, MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus aculabrum | Benton County cave crayfish | crayfish, Benton County cave | K02J | I01 | AR, MO; U.S.A. (AR) | Cambaridae | Apr 27, 1993 | Crustaceans | 4 | Endangered | 3, 4 | US | I | Wherever found |
| Cambarus batchi | [Unnamed] crayfish | Crayfish, [unnamed] | K025 | I01 | KY; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus bouchardi | Big South Fork crayfish | Crayfish, Big South Fork | K01O | I01 | KY, TN; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus callainus | Big Sandy crayfish | Crayfish, Big Sandy | K03K | I01 | KY, VA, WV; ; U.S.A. (KY, VA, WV); upper Big Sandy watershed | Cambaridae | May 09, 2016 | Crustaceans | 5 | Threatened | 4, 5 | US | I | Wherever found |
| Cambarus catagius | Greensboro burrowing crayfish | Crayfish, Greensboro burrowing | K027 | I01 | NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus chasmodactylus | New River riffle crayfish | Crayfish, New River riffle | K028 | I01 | NC, VA, WV; | Cambaridae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Cambarus chaugaensis | Chauga crayfish | crayfish, Chauga | K069 | I01 | GA, NC, SC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus coosawattae | Coosawattae crayfish | crayfish, Coosawattae | K06A | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus cracens | Slenderclaw crayfish | crayfish, Slenderclaw | K06B | I01 | AL; | Cambaridae | NA | Crustaceans | 4 | Proposed Threatened | 4 | US | I | Wherever found |
| Cambarus cryptodytes | Dougherty Plain Cave crayfish | crayfish, Dougherty Plain Cave | K065 | I01 | FL, GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus cymatilis | Conasauga Blue burrower | burrower, Conasauga Blue | K06C | I01 | GA, TN; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus eeseeohensis | Grandfather Mountain crayfish | crayfish, Grandfather Mountain | K06D | I01 | NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus elkensis | Elk River crayfish | crayfish, Elk River | K06E | I01 | WV; | Cambaridae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Cambarus englishi | Tallapoosa River crayfish | crayfish, Tallapoosa River | K03J | I01 | AL, GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus extraneus | Chickamauga crayfish | Crayfish, Chickamauga | K01P | I01 | GA, TN; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus fasciatus | Etowah crayfish | crayfish, Etowah | K06F | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus georgiae | Little Tennessee crayfish | Crayfish, Little Tennessee | K03T | I01 | GA, NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus harti | Piedmont Blue burrower | burrower, Piedmont Blue | K06G | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus hiwasseensis | Hiwassee crayfish | Crayfish, Hiwassee | K03R | I01 | GA, NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus jezerinaci | Spiny Scale crayfish | crayfish, Spiny Scale | K06H | I01 | TN, VA; | Cambaridae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Cambarus jonesi | Alabama Cave crayfish | crayfish, Alabama Cave | K06I | I01 | AL; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus miltus | [Unnamed] crayfish | Crayfish, [unnamed] | K02S | I01 | AL; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus nerterius | Greenbrier Cave crayfish | crayfish, Greenbrier Cave | K06J | I01 | WV; | Cambaridae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Cambarus obeyensis | Obey crayfish | Crayfish, Obey | K01T | I01 | TN; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus parrishi | Parrish crayfish | Crayfish, Parrish | K03U | I01 | GA, NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus pristinus | Pristine crayfish | crayfish, Pristine | K06K | I01 | TN; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus reburrus | French Broad crayfish | Crayfish, French Broad | K03Q | I01 | NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus scotti | Chattooga River crayfish | crayfish, Chatooga River | K06L | I01 | AL, GA; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus speciosus | Beautiful crayfish | crayfish, Beautiful | K06M | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus spicatus | Little River crayfish | Crayfish, Little River | K02X | I01 | SC; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus strigosus | Lean crayfish | crayfish, Lean | K06N | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cambarus subterraneus | Delaware County Cave Crayfish | Crayfish, Delaware County Cave | K07Z | I01 | Cambaridae | NA | Crustaceans | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Cambarus tartarus | [Unnamed] crayfish | Crayfish, [unnamed] | K02T | I01 | OK; | Cambaridae | NA | Crustaceans | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Cambarus unestami | Blackbarred crayfish | crayfish, Blackbarred | K06O | I01 | AL, GA; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus veteranus | Guyandotte River crayfish | Crayfish, Guyandotte River | K08X | I01 | WV; ; U.S.A. (WV); upper Guyandotte River watershed | Cambaridae | May 09, 2016 | Crustaceans | 5 | Endangered | 5 | US | I | Wherever found |
| Cambarus williami | Brawleys Fork crayfish | crayfish, Brawleys Fork | K06P | I01 | TN; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cambarus zophonastes | Hell Creek Cave crayfish | Crayfish, Hell Creek Cave | K02H | I01 | AR; U.S.A. (AR) | Cambaridae | Apr 07, 1987 | Crustaceans | 4 | Endangered | 4 | US | I | Wherever found |
| Camelus bactrianus | Bactrian camel | Camel, Bactrian | A04U | V01 | Entire | Camelidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Camissonia atwoodii | No common name | No common name | Q30C | P01 | UT; | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Camissonia bairdii | Baird's evening primrose | primrose Baird's evening | Q3LR | P01 | Onagraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Camissonia benitensis | San Benito evening-primrose | Evening-primrose, San Benito | Q26O | P01 | CA; U.S.A. (CA) | Onagraceae | Feb 12, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Camissonia confertiflora | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q0AW | P01 | AZ; | Onagraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Camissonia exilis | Cottonwood Spring suncup | suncup, Cottonwood Spring | Q0AX | P01 | AZ, UT; | Onagraceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Camissonia gouldii | Diamond Valley suncup | suncup, Diamond Valley | Q0AY | P01 | AZ, UT; | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Camissonia guadalupensis clementina | San Clemente Island evening-primrose | Evening-primrose, San Clemente Island | Q2NT | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camissonia hardhamiae | Hardham's evening-primrose | Evening-primrose, Hardham's | Q2NU | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camissonia megalantha | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q0AZ | P01 | NV; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camissonia nevadensis | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q0B0 | P01 | NV; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camissonia parryi | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q2Y2 | P01 | AZ, UT; | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Camissonia sierrae alticola | Mono Hot Springs evening-primrose | Evening-primrose, Mono Hot Springs | Q2NV | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Camissonia specuicola hesperia | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q0B1 | P01 | AZ; | Onagraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Camissonia specuicola specuicola | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q0B2 | P01 | AZ; | Onagraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Camissonia tanacetifolia quadriperforata | Sierra Valley evening-primrose | Evening-primrose, Sierra Valley | Q26P | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Campanula californica | Swamp harebell | Harebell, swamp | Q0B3 | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| campanula exigua | Chaparral harebell | harebell, Chaparral | Q3K9 | P01 | campanulaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Campanula piperi | Olympic harebell | Harebell, Olympic | Q0B4 | P01 | WA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Campanula reverchonii | Basin bellflower | Bellflower, Basin | Q0B5 | P01 | TX; | Campanulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Campanula robinsiae | Brooksville bellflower | Bellflower, Brooksville | Q1TV | P01 | FL; Known to occur along pond margins in Hernando and Hillsborough Counties in Florida.; U.S.A. (FL) | Campanulaceae | Jul 27, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Campanula rotundifolia sacajaweana | No common name | No common name | Q0B6 | P01 | OR; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Campanula sharsmithiae | Mt. Hamilton harebell | Harebell, Mt. Hamilton | Q2NW | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Campanula shetleri | Castle Crags campanula | Campanula, Castle Crags | Q0B7 | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Campanula wilkinsiana | Wilkin's harebell | Harebell, Wilkin's | Q0B8 | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Campeloma decampi | Slender campeloma | Campeloma, slender | G098 | I01 | AL; U.S.A. (AL) | Viviparidae | Feb 25, 2000 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Campephilus imperialis | Imperial woodpecker | Woodpecker, imperial | B03P | V01 | Mexico | Picidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Campephilus principalis | Ivory-billed woodpecker | Woodpecker, ivory-billed | B03Q | V01 | AR; also believed to exist in Cuba; Cuba, U.S.A. (southcentral and southeastern); Information on the status of the population is limited and current population size and distribution is not known. In 2005, information was released on the presence of at least one Ivory-billed Woodpecker in Central Arkansas. Additionally, the existence of potential habitat and numerous reports from credible sources of Ivory-billed Woodpeckers in recent decades provided motivation to carry out surveys for the species throughout its range. Searches have taken place in Texas, Arkansas, Louisiana, western Tennessee, Mississippi, southern Illinois, Georgia, South Carolina, North Carolina, and Florida. While suggestive evidence has been found in several states, no clear, conclusive photograph or video has been made as of the date of this writing. State, Federal and private partners will continue to search for evidence of the species’ presence (e.g., sightings, nest cavities) in order to document an active nest or roost when sufficient additional evidence warrants such a response. The species may also persist in a few locations in Cuba. | Picidae | Mar 11, 1967 | Birds | 4 | Endangered | 4 | US/Foreign | V | Wherever found |
| Campostoma ornatum | Mexican stoneroller | Stoneroller, Mexican | E04V | V01 | AZ, TX; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Campsicnemus mirabilis | Ko`olau spurwing long-legged fly | Long-legged fly, Ko`olau spurwing | I09G | I01 | HI; | Dolichopodidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Campylium cardotii | Cardot's campylium moss | moss Cardot's campylium | U00H | P01 | Amblystegiaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Campylopus carolinae | Savannah campylopus | Campylopus, savannah | Q30D | P01 | GA, NC; | Dicranaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Campylorhynchus brunneicapillus | Cactus Wren | Wren, Cactus | B0FZ | V01 | Certhiidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Campylorhynchus brunneicapillus couesi | San Diego cactus wren | Wren, San Diego cactus | B08Y | V01 | CA; | Troglodytidae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Canavalia hawaiiensis | Pua-kauhi | Pua-kauhi | Q0BC | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Canavalia hawaiiensis | [Unnamed] jack-bean | Jack-bean, [unnamed] | Q1TW | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Canavalia hawaiiensis | [Unnamed] jack-bean | Jack-bean, [unnamed] | Q0BA | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Canavalia hawaiiensis | [Unnamed] jack-bean | Jack-bean, [unnamed] | Q1TZ | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Canavalia kauaiensis | [Unnamed] jack-bean | Jack-bean, [unnamed] | Q0B9 | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Canavalia molokaiensis | `Awikiwiki | `Awikiwiki | Q1TX | P01 | HI; U.S.A. (HI) | Fabaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Canavalia napaliensis | `Awikiwiki | `Awikiwiki | Q1TY | P01 | HI; U.S.A. (HI) | Fabaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Canavalia pubescens | `Awikiwiki | `Awikiwiki | Q0BB | P01 | HI; | Fabaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| canis latrans | coyote | coyote | A0IT | V01 | canidae | NA | Mammals | 7 | Not Listed | NA | US | V | Wherever found | |
| Canis lupus | Gray wolf | Wolf, gray | A00D | V01 | CA, MI, OR, WA, WI; Extirpated in Regions 2,4,5,and Mexico,CP in R2; NRM delisting except WY (separate listing); PNW occupied in WA, OR, CA; Southwest separate subspecies listing; WGL listed (at this minute) and occupied in MN, WI, MN (MN separate status). Dispersers in other areas occasionally, but fail to persist. | Canidae | Mar 09, 1978 | Mammals | 6 | Endangered | 1, 3, 8 | US | V | U.S.A.: All of AL, AR, CA, CO, CT, DE, FL, GA, IA, IN, IL, KS, KY, LA, MA, MD, ME, MI, MO, MS, NC, ND, NE, NH, NJ, NV, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, and WV; and portions of AZ, NM, OR, UT, and WA as follows: (1) Northern AZ (that portion north of the centerline of Interstate Highway 40); (2) Northern NM (that portion north of the centerline of Interstate Highway 40); (3) Western OR (that portion of OR west of the centerline of Highway 395 and Highway 78 north of Burns Junction and that portion of OR west of the centerline of Highway 95 south of Burns Junction); (4) Most of Utah (that portion of UT south and west of the centerline of Highway 84 and that portion of UT south of Highway 80 from Echo to the UT/WY Stateline); and (5) Western WA (that portion of WA west of the centerline of Highway 97 and Highway 17 north of Mesa and that portion of WA west of the centerline of Highway 395 south of Mesa). Mexico. |
| Canis lupus | Gray wolf | Wolf, gray | A00D | V02 | MN; U.S.A. (MN) | Canidae | Mar 09, 1978 | Mammals | 3 | Threatened | 3 | US | V | U.S.A. (MN) |
| Canis lupus | Gray wolf | Wolf, gray | A00D | V15 | Canidae | Mar 09, 1978 | Mammals | 3 | Not Listed | NA | US | V | Western Great Lakes Distinct Population Segment: Minnesota, Wisconsin, and Michigan; the eastern half of North Dakota and South Dakota; the northern half of Iowa; the northern portions of Illinois and Indiana; and the northwestern portion of Ohio. | |
| Canis lupus | Gray wolf | Wolf, gray | A00D | V16 | ID, MT, OR, UT, WA, WY; | Canidae | Mar 09, 1978 | Mammals | 6 | Recovery | 1, 6 | US | V | Northern Rocky Mountain Distinct Population Segment: Montana, Idaho, Wyoming, eastern Washington, eastern Oregon, and north central Utah |
| Canis lupus baileyi | Mexican wolf | Wolf, Mexican | A00E | V01 | AZ, NM; | Canidae | Apr 28, 1976 | Mammals | 2 | Endangered | 2 | US/Foreign | V | Wherever found, except where included in an experimental population as set forth in 17.84(k) |
| Canis lupus baileyi | Mexican wolf | Wolf, Mexican | A00E | V02 | Canidae | Jan 24, 1998 | Mammals | 2 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (portions of AZ and NM)see 17.84(k) | |
| Canis lupus ligoni | Alexander Archipelago wolf | Wolf, Alexander Archipelago | A0HR | V01 | AK; southeast Alaska from Dixon Entrance to Yakutat Bay and on all the major islands in the Alexander Archipelago except Admiralty, Baranof and Chichagof islands. | Canidae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Canis rufus | Red wolf | Wolf, red | A00F | V01 | FL; Presumed extinct in wild except experimental populations in NC & TN | Canidae | Mar 11, 1967 | Mammals | 4 | Endangered | 4 | US | V | Wherever found, except where listed as an experimental population |
| Canis rufus | Red wolf | Wolf, red | A00F | V02 | NC; U.S.A. (SE U.S.A., west to central TX) | Canidae | Nov 19, 1986 | Mammals | 4 | Experimental Population, Non-Essential | 4 | US | V | U.S.A. (portions of NC and TN see 17.84(c)(9)) |
| Canis simensis | Simien fox | Fox, Simien | A07K | V01 | Entire | Canidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Canna pertusa | Maraca | Maraca | Q0BD | P01 | PR, VI; | Cannaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cantharellus noumeae | No common name | No common name | P020 | I01 | Fungiidae | Nov 06, 2015 | Corals | NMFS | Endangered | NA | Foreign | I | Entire | |
| Cantinella gelida | Frigid ambersnail | Ambersnail, frigid | G0G1 | I01 | Succineidae | NA | Snails | 3 | Not Listed | NA | US | I | Wherever found | |
| Capnia lacustra | Lake Tahoe benthic stonefly | Stonefly, Lake Tahoe benthic | I0EC | I01 | CA, NV; | Capniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Capnia lineata | Straight snowfly | Snowfly, straight | I0VV | I01 | ID; | Capniidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Capnia zukeli | Idaho snowfly | Snowfly, Idaho | I0VW | I01 | ID; | Capniidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Capparis sandwichiana | Pus pilo | Pus pilo | Q0BE | P01 | HI; | Capparaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Capra falconeri | Markhor | Markhor | A0I5 | V01 | Bovidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Capra falconeri (=aegragrus) chiltanensis | Chiltan (=wild goat) markhor | Markhor, chiltan (=wild goat) | A05B | V01 | Chiltan Range of west-central Pakistan | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capra falconeri megaceros | Straight-horned markhor | Markhor, Straight-horned | A05R | V01 | Pakistan,Afghanistan | Bovidae | Oct 07, 2014 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Capra pyrenaica pyrenaica | Pyrenean ibex | Ibex, Pyrenean | A01C | V01 | Wherever found | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capra walie | Walia ibex | Ibex, Walia | A01D | V01 | Wherever found | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Caprimulgus noctitherus | Puerto Rican nightjar | Nightjar, Puerto Rican | B04J | V01 | PR; ; U.S.A. (PR) | Caprimulgidae | Jun 04, 1973 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Caprolagus hispidus | Hispid hare | Hare, hispid | A05D | V01 | Wherever found | Leporidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capromys angelcabrerai | Cabrera's hutia | Hutia, Cabrera's | A0FH | V01 | Wherever found | Capromyidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capromys auritus | Large-eared hutia | Hutia, large-eared | A0FJ | V01 | Wherever found | Capromyidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capromys nana | Dwarf hutia | Hutia, dwarf | A0FI | V01 | Wherever found | Capromyidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Capromys sanfelipensis | Little earth hutia | Hutia, little earth | A0FK | V01 | Wherever found | Capromyidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cardamine clematitis | Mountain bittercress | Bittercress, mountain | Q30E | P01 | NC; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cardamine constancei | Constance's bittercress | Bittercress, Constance's | Q0BF | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cardamine flexuosa | Kona bittercress | Bittercress, Kona | Q2Y3 | P01 | HI; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cardamine longii | Long's bittercress | Bittercress, Long's | Q0BG | P01 | DE, MA, MD, ME, NC, NH, NJ, NY, RI, VA; | Brassicaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Cardamine micranthera | Small-anthered bittercress | Bittercress, small-anthered | Q1U0 | P01 | NC, VA; U.S.A. (VA, NC) | Brassicaceae | Sep 21, 1989 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Cardamine nuttallii | Yellow-tubered toothwort | Toothwort, yellow-tubered | Q30F | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cardamine pattersonii | Saddle Mountain bittercress | Bittercress, Saddle Mountain | Q0BH | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cardamine penduliflora | No common name | No common name | Q0BI | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cardamine rupicola | [Unnamed] bittercress | Bittercress, [unnamed] | Q0BJ | P01 | MT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Carduelis cucullata | Red siskin | Siskin, red | B05N | V01 | South America | Fringillidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Carduelis lawrencei | Lawrence's Goldfinch | Goldfinch, Lawrence's | B0J8 | V01 | Fringillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Carelia spp. (ca 12) | Spp. (ca 12) carelia | Carelia, spp. (ca 12) | G01O | I01 | HI; | Amastridae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V02 | AL, FL, GA, LA, MS, NC, SC, TX, VA; ; Northwest Atlantic Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | 4 | Threatened | 2, 4, 5 | US/Foreign | V | Northwest Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northwest Atlantic Ocean west of 40 degrees W. Long |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V03 | OR; North Pacific Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | 4 | Endangered | 1 | US/Foreign | V | North Pacific Ocean DPS - Loggerhead sea turtles originating from the North Pacific north of the equator and south of 60 degrees N. Lat |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V04 | Mediterranean Sea Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Endangered | NA | Foreign | V | Mediterranean Sea DPS - Loggerhead sea turtles originating from the Mediterranean Sea east of 5 degrees 36 minues W. Long. |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V05 | North Indian Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Endangered | NA | Foreign | V | North Indian Ocean DPS - Loggerhead sea turtles originating from the North Indian Ocean north of the equator and south of 30? N. Lat |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V06 | Northeast Atlantic Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Endangered | NA | Foreign | V | Northeast Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northeast Atlantic Ocean north of the equator, south of 60 degrees N. Lat., and east of 40 degrees W. Long., except in the vicinity of the Strait of Gibraltar where the eastern boundary is 5 degrees 36 minutes W. Long |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V07 | South Atlantic Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Threatened | NA | Foreign | V | Loggerhead sea turtles originating from the South Atlantic Ocean south of the equator, north of 60 degrees S. Lat., west of 20 degrees E. Long., and east of 67 degrees W. Long |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V08 | South Pacific Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Endangered | NA | Foreign | V | Loggerhead sea turtles originating from the South Pacific south of the equator, north of 60 degrees S. Lat., west of 67 degrees W. Long., and east of 141 degrees E. Long. |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V09 | Southeast Indian Ocean Basin; South Pacific Ocean Basin as far east as 141 degrees E. Long | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Threatened | NA | Foreign | V | Loggerhead sea turtles originating from the Southeast Indian Ocean south of the equator, north of 60 degrees S. Lat., and east of 80 degrees E. Long.; South Pacific Ocean south of the equator, north of 60degrees S. Lat., and west of 141 degrees E. Long |
| Caretta caretta | Loggerhead sea turtle | Sea turtle, loggerhead | C00U | V10 | Southwest Indian Ocean Basin | Cheloniidae | Jul 23, 1978 | Reptiles | Foreign | Threatened | NA | Foreign | V | Loggerhead sea turtles originating from the Southwest Indian Ocean north of the equator, south of 30 degrees N. Lat., east of 20 degrees E. Long., and west of 80 degrees E. Long. |
| Carex albida | White sedge | Sedge, white | Q0BL | P01 | CA; U.S.A. (CA) | Cyperaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Carex arapahoensis | [Unnamed] sedge | Sedge, [unnamed] | Q0BM | P01 | CO, MT, UT; | Cyperaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Carex austrocaroliniana | [Unnamed] sedge | Sedge, [unnamed] | Q0BN | P01 | AL, GA, KY, NC, SC, TN; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex baltzellii | [Unnamed] sedge | Sedge, [unnamed] | Q0BO | P01 | FL; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex barrattii | Barratt's sedge | Sedge, Barratt's | Q2NX | P01 | AL, CT, DE, MD, NC, NJ, NY, PA, TN, VA; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Carex bicknellii opaca | [Unnamed] sedge | Sedge, [unnamed] | Q30G | P01 | AR; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex biltmoreana | Biltmore sedge | Sedge, Biltmore | Q0BP | P01 | GA, NC, SC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex brysonii | Bryson's sedge | sedge, Bryson's | Q3P6 | P01 | AL; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Carex chapmanii | Chapman's sedge | Sedge, Chapman's | Q0BQ | P01 | FL; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex communis var. amplisquama | Fort Mountain Sedge | Sedge, Fort Mountain | Q0BR | P01 | GA, NC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex decomposita | [Unnamed] sedge | Sedge, [unnamed] | Q2Y4 | P01 | AL, AR, FL, GA, IL, IN, MD, MI, MO, MS, NC, OH, OK, SC, TN, TX, VA; | Cyperaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4, 5 | US | P | Wherever found |
| Carex fissa | [Unnamed] sedge | Sedge, [unnamed] | Q0BT | P01 | KS, OK; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Carex formosa | [Unnamed] sedge | Sedge, [unnamed] | Q30H | P01 | MI, MN, ND, NY, OH, WI; | Cyperaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5, 6 | US | P | Wherever found |
| Carex haysii | [Unnamed] sedge | Sedge, [unnamed] | Q3BY | P01 | UT; | Cyperaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Carex hyalina | Tissue sedge | Sedge, tissue | Q3BZ | P01 | AR, OK, TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Carex impressinervia | Ravine sedge | sedge, Ravine | Q30I | P01 | AL, MS, NC, SC; | Cyperaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Carex interrupta | [Unnamed] sedge | Sedge, [unnamed] | Q0BU | P01 | OR, WA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Carex josselynii | Josselyn's sedge | Sedge, Josselyn's | Q0BW | P01 | ME; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Carex latebracteata | Waterfall's sedge | Sedge, waterfall's | Q0BX | P01 | AR, OK; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Carex lenticularis dolia | [Unnamed] sedge | Sedge, [unnamed] | Q0BY | P01 | AK, MT; Canada (B.C,Yukon) | Cyperaceae | NA | Flowering Plants | 7 | Not Listed | 6, 7 | US/Foreign | P | Wherever found |
| Carex lutea | Golden sedge | Sedge, golden | Q3HD | P01 | NC; U.S.A. (NC) | Cyperaceae | Jan 23, 2002 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Carex manhartii | Manhart's sedge | Sedge, Manhart's | Q30J | P01 | NC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex mariposana | Sierra sedge | Sedge, Sierra | Q0C4 | P01 | CA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| carex mckittrickensis | Guadalupe Mountain sedge | sedge, Guadalupe Mountain | Q3LC | P01 | cyperaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Carex micropoda | Anderson sedge | Sedge, Anderson | Q0BV | P01 | AK; | Cyperaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Carex microptera crassinervia | Small-living, thick-nerved sedge | Sedge, small-living, thick-nerved | Q2Y5 | P01 | CO, MT, NV, WY; | Cyperaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Carex misera | [Unnamed] sedge | Sedge, [unnamed] | Q0BZ | P01 | GA, NC, TN; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex obispoensis | San Luis sedge | Sedge, San Luis | Q0C0 | P01 | CA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Carex onusta | [Unnamed] sedge | Sedge, [unnamed] | Q0C1 | P01 | TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Carex oronensis | [Unnamed] sedge | Sedge, [unnamed] | Q0C2 | P01 | ME; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Carex parryana | Indian Valley sedge | Sedge, Indian Valley | Q0BK | P01 | ID; Believed to be extinct | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Carex parryana idahoa | [Unnamed] sedge | Sedge, [unnamed] | Q0C3 | P01 | ID, MT; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Carex polymorpha | Variable sedge | Sedge, variable | Q2NY | P01 | CT, DE, MA, MD, ME, NH, NJ, NY, PA, RI, VA, WV; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Carex purpurifera | [Unnamed] sedge | Sedge, [unnamed] | Q0C5 | P01 | AL, GA, KY, OH, TN, VA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Carex radfordii | Radford's sedge | sedge, Radford's | Q3NH | P01 | NC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex roanensis | [Unnamed] sedge | Sedge, [unnamed] | Q0C6 | P01 | NC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Carex schweinitzii | [Unnamed] sedge | Sedge, [unnamed] | Q3C0 | P01 | CT, DE, MA, MO, NC, NJ, NY, PA, VA, VT, WI; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 3, 4, 5 | US/Foreign | P | Wherever found |
| Carex scirpoidea curatorum | [Unnamed] sedge | Sedge, [unnamed] | Q0C7 | P01 | AZ, UT; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Carex socialis | [Unnamed] sedge | Sedge, [unnamed] | Q0C8 | P01 | AR, IL, IN, KY, MO, TN; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Carex specuicola | Navajo sedge | Sedge, Navajo | Q1U1 | P01 | AZ, UT; U.S.A. (UT, AZ) | Cyperaceae | May 08, 1985 | Flowering Plants | 2 | Threatened | 2, 6 | US | P | Wherever found |
| Carex sterilis | Aroostook sedge | Sedge, Aroostook | Q0BS | P01 | ME; | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Carex tompkinsii | Thompkins' sedge | Sedge, Thompkins' | Q0C9 | P01 | CA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Carex wahuensis herbstii | No common name | No common name | Q30K | P01 | HI; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Carex whitneyi | Whitney sedge | Sedge, Whitney | Q0CA | P01 | CA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Carlquistia muirii | Muir's raillardella | Raillardella, Muir's | Q1KT | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Carolella busckana | Busck's gall moth | Gall moth, Busck's | I076 | I01 | CA; | Phaloniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Carpenteria californica | [Unnamed] carpenteria | Carpenteria, [unnamed] | Q26Q | P01 | CA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Carpodacus cassinii | Cassin's Finch | Finch, Cassin's | B0J6 | V01 | Fringillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Carposina viridis | Green carposinid moth | Carposinid moth, green | I04K | I01 | HI; | Carposinidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Carterocephalus palaemon ssp. | Sonoma arctic skipper | Skipper, Sonoma arctic | I0OG | I01 | CA; | Hesperiidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Casarea dussumieri | Round Island casarea boa | Boa, Round Island casarea | C02O | V01 | Indian Ocean-Mauritius | Boidae | Mar 20, 1980 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cassia exunguis | [Unnamed] tamarindillo | Tamarindillo, [unnamed] | Q0CB | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cassia fasciculata macrosperma | No common name | No common name | Q2NZ | P01 | MD, VA; | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Castanea pumila ozarkensis | Ozark chinquapin | Chinquapin, Ozark | Q0CC | P01 | AL, AR, MO, OK; | Fagaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Castilleja affinis ssp. neglecta | Tiburon paintbrush | Paintbrush, Tiburon | Q26R | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Castilleja ambigua humboldtiensis | Humboldt Bay owl's clover | clover, Humboldt Bay Owl's | Q0CD | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja annua | No common name | No common name | Q26S | P01 | AK; | Scrophulariaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Castilleja applegatei ssp. martinii | Clokey paintbrush | paintbrush, Clokey | Q3JE | P01 | scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Castilleja aquariensis | Aquarius paintbrush | Paintbrush, Aquarius | Q0CE | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Castilleja brevilobata | Short-lobed paintbrush | Paintbrush, short-lobed | Q0CF | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Castilleja campestris ssp. succulenta | Fleshy owl's-clover | Owl's-clover, fleshy | Q0CG | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Mar 26, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Castilleja chlorotica | Green-tinged paintbrush | Paintbrush, green-tinged | Q0CH | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja christii | Christ's paintbrush | Paintbrush, Christ's | Q0CI | P01 | ID; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja chrymactis | Point Reyes paintbrush | Paintbrush, Point Reyes | Q0CW | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja chrysantha | Common Wallowa paintbrush | Paintbrush, common Wallowa | Q0D2 | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja chrysantha | No common name | No common name | Q0CJ | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja cinerea | Ash-grey paintbrush | Paintbrush, ash-grey | Q0CL | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Castilleja coccinea | Jeff Davis Parish indian paintbrush | Indian paintbrush, Jeff Davis Parish | Q0CY | P01 | LA; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Castilleja cryptantha | Obscure Indian paintbrush | Paintbrush, Obscure Indian | Q0CM | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja elata | Siskiyou paintbrush | Paintbrush, Siskiyou | Q2Y6 | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Castilleja elongata | Tall paintbrush | Paintbrush, tall | Q0CP | P01 | TX; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Castilleja fraterna | No common name | No common name | Q0CQ | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja glandulifera | No common name | No common name | Q0CS | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja gleasonii | Mt. Gleason paintbrush | Paintbrush, Mt. Gleason | Q0CR | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja grisea | San Clemente Island Paintbrush | Paintbrush, San Clemente Island | Q1U2 | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Sep 12, 1977 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Castilleja hololeuca | White-felted paintbrush | Paintbrush, white-felted | Q26T | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja kaibabensis | Kaibab paintbrush | Paintbrush, Kaibab | Q0CT | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Castilleja lasiorhyncha | San Bernardino Mountains orthocarpus | Orthocarpus, San Bernardino Mountains | Q0CU | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja lemmonii | Culbertson's paintbrush | Paintbrush, Culbertson's | Q0CO | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja lemmonii | Lemmon's paintbrush | Paintbrush, Lemmon's | Q0CV | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja levisecta | golden paintbrush | paintbrush, golden | Q26U | P01 | OR, WA; Canada (B.C.); U.S.A. (WA, OR), Canada (B.C.) | Orobanchaceae | Jun 11, 1997 | Flowering Plants | 1 | Threatened | 1 | US/Foreign | P | Wherever found |
| Castilleja linoides | No common name | No common name | Q0CX | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja martinii ewanii | Ewan's paintbrush | Paintbrush, Ewan's | Q0CZ | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja mendocinensis | Mendocino coast paintbrush | Paintbrush, Mendocino coast | Q0D0 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja mollis | Soft-leaved paintbrush | Paintbrush, soft-leaved | Q0D1 | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Castilleja nervata | No common name | No common name | Q0CN | P01 | AZ; Believed to be extinct | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Castilleja oresbia | No common name | No common name | Q2Y7 | P01 | ID, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja parviflora olympica | No common name | No common name | Q0D4 | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja parvula | Tushar indian paintbrush | Indian paintbrush, Tushar | Q0D3 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Castilleja pilosa steenensis | Steen's mountain paintbrush | Paintbrush, Steen's mountain | Q0D5 | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja revealii | Reveal indian paintbrush | Indian paintbrush, Reveal | Q0D6 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Castilleja rubida | No common name | No common name | Q3C1 | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castilleja salsuginosa | Monte Neva paintbrush | Paintbrush, Monte Neva | Q0D7 | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Castilleja scabrida | [Unnamed] indian paintbrush | Indian paintbrush, [unnamed] | Q0D8 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Castilleja sulphurea | White Mountains paintbrush | Paintbrush, White Mountains | Q30L | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Castilleja uliginosa | Pitkin Marsh paintbrush | Paintbrush, Pitkin Marsh | Q0D9 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Castilleja wootonii | [Unnamed] indian paintbrush | Indian paintbrush, [unnamed] | Q0CK | P01 | TX; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Castilleja xanthotricha | No common name | No common name | Q0DA | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Castor fiber birulai | Beaver (Mongolian) | Beaver (Mongolian) | A04R | V01 | Entire | Castoridae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| catapyrenium granulosum | No common name | No common name | U00F | P01 | verrucariaceae | NA | Lichens | 2 | Not Listed | NA | US | P | Wherever found | |
| Catesbaea melanocarpa | No common name | No common name | Q30M | P01 | PR, VI; U.S.A. (VI, PR), Antigua, Barbuda, Guadalupe | Rubiaceae | Mar 17, 1999 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| cathartes aura | Turkey vulture | vulture, Turkey | B0F0 | V01 | ciconiidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Catharus bicknelli | Bicknell's thrush | Thrush, Bicknell's | B0AY | V01 | MA, ME, NH, NY, VT; | Muscicapidae | NA | Birds | 5 | Not Listed | 5 | US/Foreign | V | Wherever found |
| Catinella gelida | Frigid Ambersnail | Ambersnail, Frigid | G04E | I01 | IA; | Succineidae | NA | Snails | 3 | Under Review in the Candidate or Petition Process | 3 | US | I | Wherever found |
| Catocala marmorata | Marbled underwing moth | Moth, marbled underwing | I0B5 | I01 | DE, IL, IN, KY, MO, NC, NJ, NY, OH, PA, SC, VA, VT, WV; | Noctuidae | NA | Insects | 4 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Catocala pretiosa pretiosa | Precious underwing | Underwing, precious | I0F2 | I01 | CT, DE, MA, MD, NH, NJ, NY, OH, PA, VA; | Noctuidae | NA | Insects | 5 | Not Listed | 3, 5 | US | I | Wherever found |
| Catopuma (=Felis) temminckii | Asian golden (=Temmnick's) cat | Cat, Asian golden (=Temmnick's) | A050 | V01 | Entire; Nepal,China,Southeast Asia,Indonesia (Sumatra) | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| catostomus bernardini | Yaqui sucker | sucker, Yaqui | E0AW | V01 | catostomidae | NA | Fishes | 2 | Not Listed | NA | US | V | Wherever found | |
| Catostomus catostomus | longnose sucker | sucker longnose | E0AN | V01 | Catostomidae | NA | Fishes | 5 | Not Listed | NA | US | V | Wherever found | |
| Catostomus clarki intermedius | White River desert sucker | Sucker, White River desert | E059 | V01 | NV; | Catostomidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Catostomus clarkii | Desert sucker | Sucker, desert | E061 | V01 | AZ, NM, NV, UT; | Catostomidae | NA | Fishes | 1 | Not Listed | 2, 6, 8 | US/Foreign | V | Desert |
| Catostomus clarkii | Meadow Valley Wash desert sucker | Sucker, Meadow Valley Wash desert | E062 | V01 | NV; | Catostomidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Meadow Valley |
| Catostomus discobolus yarrowi | Zuni bluehead Sucker | Sucker, Zuni bluehead | E063 | V01 | AZ, NM; | Catostomidae | Aug 25, 2014 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Catostomus insignis | Sonora sucker | Sucker, Sonora | E09L | V01 | AZ, NM; | Catostomidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Catostomus latipinnis | Flannelmouth sucker | Sucker, flannelmouth | E07V | V01 | AZ, CA, NV, UT; | Catostomidae | NA | Fishes | 2 | Not Listed | 2, 6, 8 | US | V | Wherever found |
| Catostomus microps | Modoc Sucker | Sucker, Modoc | E053 | V01 | CA, OR; The Modoc sucker is found in the Pit River/Goose Lake drainage in Lassen and Modoc counties, California (Turner, Rush, Dutch Flat, and Ash creeks and associates tributaries), and in Lake County, Oregon (Thomas Creek). The presence of the species in Thomas Creek was only recently recognized. Over its range it is found in about 40 miles of habitat, with most of this being in Thomas Creek.; U.S.A. (CA) | Catostomidae | Jun 11, 1985 | Fishes | 8 | Recovery | 1, 8 | US | V | Wherever found |
| Catostomus occidentalis lacusanserinus | Goose Lake sucker | Sucker, Goose Lake | E04Y | V01 | CA, OR; | Catostomidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Catostomus rimiculus ssp. | Jenny Creek sucker | Sucker, Jenny Creek | E04Z | V01 | CA, OR; | Catostomidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Catostomus santaanae | Santa Ana sucker | Sucker, Santa Ana | E07W | V01 | CA; U.S.A. (CA) | Catostomidae | Apr 12, 2000 | Fishes | 8 | Threatened | 8 | US | V | Los Angeles River basin, San Gabriel River basin, Santa Ana River basin |
| Catostomus snyderi | Klamath largescale sucker | Sucker, Klamath largescale | E051 | V01 | CA, OR; | Catostomidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Catostomus sp. | Wall Canyon sucker | Sucker, Wall Canyon | E056 | V01 | NV; | Catostomidae | NA | Fishes | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Catostomus warnerensis | Warner sucker | Sucker, Warner | E057 | V01 | CA, NV, OR; U.S.A. (OR) | Catostomidae | Sep 27, 1985 | Fishes | 1 | Threatened | 1, 8 | US | V | Wherever found |
| Catreus wallichii | Cheer pheasant | Pheasant, cheer | B06J | V01 | Pakistan, Nepal, India | Phasianidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Caulanthus amplexicaulis barbarae | Santa Barbara jewelflower | Jewelflower, Santa Barbara | Q0DB | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Caulanthus californicus | California jewelflower | Jewelflower, California | Q2Y8 | P01 | CA; U.S.A. (CA) | Brassicaceae | Jul 19, 1990 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Caulanthus heterophyllus | Slender-pod jewelflower | Jewelflower, slender-pod | Q0DC | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Caulanthus simulans | Payson's jewelflower | Jewelflower, Payson's | Q2S8 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Caulostramina jaegeri | Jaeger's caulostramina | Caulostramina, Jaeger's | Q0DD | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cavaticovelia aaa | Aaa water treader bug | Bug, Aaa water treader | I02T | I01 | HI; | Mesoveliidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ceanothus arboreus | [Unnamed] ceanothus | Ceanothus, [unnamed] | Q2Y9 | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus arboreus glaber | No common name | No common name | Q2S9 | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus confusus | Rincon ceanothus | Ceanothus, Rincon | Q2O0 | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus cuneatus rigidus | Monterey ceanothus | Ceanothus, Monterey | Q0DE | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus cyaneus | Lakeside ceanothus | Ceanothus, Lakeside | Q2O1 | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus divergens | Calistoga ceanothus | Ceanothus, Calistoga | Q2O2 | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus ferrisae | Coyote ceanothus | Ceanothus, coyote | Q1U3 | P01 | CA; U.S.A. (CA) | Rhamnaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Ceanothus foliosus vineatus | Vine Hill ceanothus | Ceanothus, Vine Hill | Q30N | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus gloriosus porrectus | Mt. Vision ceanothus | Ceanothus, Mt. Vision | Q0DF | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus hearstiorum | Hearst's ceanothus | Ceanothus, Hearst's | Q0DG | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus impressus nipomensis | Nipomo ceanothus | Ceanothus, Nipomo | Q26V | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus maritimus | Maritime california-lilac | California-lilac, maritime | Q0DH | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus masonii | Bolinas ceanothus | Ceanothus, Bolinas | Q0DI | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus ophiochilus | Vail Lake ceanothus | Ceanothus, Vail Lake | Q3AH | P01 | CA; U.S.A. (CA) | Rhamnaceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Ceanothus prostratus laxus | Squaw carpet | Squaw carpet | Q0DJ | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus roderickii | Pine Hill ceanothus | Ceanothus, Pine Hill | Q0DK | P01 | CA; U.S.A. (CA) | Rhamnaceae | Oct 18, 1996 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Ceanothus sonomensis | Sonoma ceanothus | Ceanothus, Sonoma | Q30O | P01 | CA; | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ceanothus verrucosus | Wart-stemmed ceanothus | Ceanothus, wart-stemmed | Q30P | P01 | CA; Mexico (Baja California) | Rhamnaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Cenchrus agrimonioides | Kamanomano | Kamanomano | Q1U4 | P01 | HI; U.S.A. (HI) | Poaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| centaurium blumbergianum | blumberg rosita | No common name | Q3LE | P01 | gentianaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Centaurium namophilum | Spring-loving centaury | Centaury, spring-loving | Q1U5 | P01 | NV; U.S.A. (NV, CA) | Gentianaceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Centrocercus minimus | Gunnison sage-grouse | sage-grouse, Gunnison | B0B0 | V01 | CO, UT; | Phasianidae | Dec 22, 2014 | Birds | 6 | Threatened | 6 | US | V | Wherever found |
| Centrocercus urophasianus | Greater sage-grouse | Sage-grouse, greater | B06W | V01 | WA; | Phasianidae | NA | Birds | 1 | Not Listed | 1 | US/Foreign | V | Columbia basin DPS, WA |
| Centrocercus urophasianus | Greater sage-grouse | Sage-grouse, greater | B06W | V02 | CA, CO, ID, MT, ND, NV, OR, SD, UT, WA, WY; ; U.S.A. (AZ, CA, CO, ID, MT, NE, NV, ND, OR, SD, UT, WA, WY), Canada | Phasianidae | NA | Birds | 6 | Not Listed | 1, 6, 8 | US/Foreign | V | Wherever found |
| Centrocercus urophasianus | Greater sage-grouse | Sage-grouse, greater | B06W | V03 | CA, NV; | Phasianidae | NA | Birds | 8 | Proposed Threatened | 8 | US | V | Bi-State |
| Centrocercus urophasianus | Greater sage-grouse | Sage-grouse, greater | B06W | V04 | Phasianidae | NA | Birds | 1 | Not Listed | NA | US | V | Western subspecies | |
| Centrosema arenicola | [Unnamed] butterfly-pea | Butterfly-pea, [unnamed] | Q0DL | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cephalophus jentinki | Jentink's duiker | Duiker, Jentink's | A07I | V01 | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Cephalorhynchus hectori hectori | South Island Hector's dolphin | dolphin, South Island Hector's | A0LD | V01 | Delphinidae | Oct 19, 2017 | Mammals | NMFS | Threatened | NA | Foreign | V | Entire | |
| Cephalorhynchus hectori maui | Maui dolphin | dolphin, Maui | A0LC | V01 | Delphinidae | Oct 19, 2017 | Mammals | NMFS | Endangered | NA | Foreign | V | Entire | |
| Cephaloziella obtusilobula | Roundleaf Liverwort | Liverwort, Roundleaf | Q30R | P01 | GA, NC; Possibly extinct | Cephaloziellaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ceraclea enodis | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0N4 | I01 | AL, NC; | Leptoceridae | NA | Insects | 4 | Not Listed | 4 | US/Foreign | I | Wherever found |
| Ceraclea floridana | Florida ceraclean longhorn caddisfly | Caddisfly, Florida ceraclean longhorn | I03P | I01 | FL; Possibly extinct,not reported since 1965 | Leptoceridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ceraclea sp. | Lenat's ceraclean caddisfly | Caddisfly, Lenat's ceraclean | I0P3 | I01 | NC; | Leptoceridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ceraclea vertreesi | Vertrees's ceraclean caddisfly | Caddisfly, Vertrees's ceraclean | I04H | I01 | OR; | Leptoceridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Cerastium aleuticum | Aleutian chickweed | Chickweed, Aleutian | Q0DM | P01 | AK; | Caryophyllaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Cerastium arvense villosissimum | Field, long-hairy chickweed | Chickweed, field, long-hairy | Q0DN | P01 | PA; | Caryophyllaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Ceratophyllum floridanum | Florida hornwort | Hornwort, Florida | Q0DP | P01 | FL; | Ceratophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ceratopsyche abella | Abellan hydropsyche caddisfly | Caddisfly, Abellan hydropsyche | I037 | I01 | OR; | Hydropsychidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ceratopsyche etnieri | Buffalo Springs caddisfly | Caddisfly, Buffalo Springs | I03E | I01 | TN; | Hydropsychidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ceratotherium simum cottoni | Northern white rhinoceros | Rhinoceros, northern white | A025 | V01 | Zaire, Uganda, Sudan, Central African Republic | Rhinocerotidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Zaire, Uganda, Sudan, Central African Republic |
| Ceratotherium simum ssp. simum | Southern white rhinoceros | Rhinoceros, Southern white | A0KU | V01 | Rhinocerotidae | Sep 11, 2013 | Mammals | Foreign | Similarity of Appearance to a Threatened Taxon | NA | Foreign | V | Wherever found | |
| Cercocarpus traskiae | Catalina Island mountain-mahogany | Mountain-mahogany, Catalina Island | Q0DQ | P01 | CA; U.S.A. (CA) | Rosaceae | Aug 08, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cercocebus galeritus galeritus | Tana River mangabey | Mangabey, Tana River | A01P | V01 | Kenya | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercocebus torquatus | White-collared mangabey | Mangabey, white-collared | A06P | V01 | Senegal to Ghana;Nigeria to Gabon | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercopithecus diana | Diana monkey | Monkey, Diana | A06T | V01 | Coastal West Africa | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercopithecus erythrogaster | Red-bellied monkey | Monkey, red-bellied | A06V | V01 | Western Nigeria | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercopithecus erythrotis | Red-eared nose-spotted monkey | Monkey, red-eared nose-spotted | A06W | V01 | Nigeria,Fernando Po,Cameroon; Western Nigeria | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercopithecus lhoesti | L'hoest's monkey | Monkey, L'hoest's | A06U | V01 | Upper Eastern Congo Basin,Cameroon | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cercyonis meadii alamosa | Alamosa satyr butterfly | Butterfly, alamosa satyr | I003 | I01 | CO; | Nymphalidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Cercyonis pegala carsonensis | Carson Valley wood nymph | Wood nymph, Carson Valley | I0OS | I01 | CA, NV; | Nymphalidae | NA | Insects | 8 | Not Listed | 8 | US | I | Entire |
| Cercyonis pegala ssp. | White River wood nymph | Wood nymph, White River | I0OT | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | White River |
| Cercyonis sthenele sthenele | Sthenele wood nymph | Wood nymph, sthenele | I0GM | I01 | CA; Believed to be extinct | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cereus eriophorus var. fragrans | Fragrant prickly-apple | Prickly-apple, fragrant | Q1U6 | P01 | FL; U.S.A. (FL) | Cactaceae | Nov 01, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Cereus gracilis simpsonii | Simpson's prickly-apple | Prickly-apple, Simpson's | Q0DS | P01 | FL; | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| certhia americana | Brown creeper | creeper, Brown | B0DY | V01 | certhilidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Cervus alfredi | Visayan deer | Deer, Visayan | A0FT | V01 | Philippines | Cervidae | Sep 01, 1988 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus duvauceli | Swamp deer | Deer, swamp | A00Y | V01 | Nepal,India | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus bactrianus | Bactrian deer | Deer, Bactrian | A053 | V01 | Afghanistan, Tajikistan, Uzbekistan; U.S.S.R,Afghanistan | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus barbarus | Barbary stag | Stag, Barbary | A067 | V01 | Tunisia, Alegeria | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus barbarus | Barbary deer | Deer, Barbary | A054 | V01 | Entire | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus corsicanus | Corsican red deer | Deer, Corsican red | A07B | V01 | France (Corsica),Italy (Sardinia); France, Italy | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus hanglu | Kashmir stag | Stag, Kashmir | A02X | V01 | Kashmir | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus macneilii | McNeill's deer | Deer, McNeill's | A00W | V01 | China; China (Sinkiang,Tibet) | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus wallichi | Shou | Shou | A02B | V01 | China (Tibet),Bhutan | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus elaphus yarkandensis | Yarkand deer | Deer, Yarkand | A07H | V01 | China (Sinkiang) | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus eldi | Eld's brow-antlered Deer | Deer, Eld's brow-antlered | A00U | V01 | India; India to Southeast Asia | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus nippon grassianus | Shansi sika deer | Deer, Shansi sika | A07F | V01 | China (Shansi Province) | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus nippon keramae | Ryukyu sika deer | Deer, Ryukyu sika | A07E | V01 | Japan (Ryukyu Islands) | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus nippon kopschi | South China sika deer | Deer, South China sika | A07G | V01 | Southern China | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus nippon mandarinus | North China sika deer | Deer, North China sika | A07D | V01 | China (Shantung and Chihli Provinces) | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cervus nippon taiouanus | Formosan sika deer | Deer, Formosan sika | A07C | V01 | Columbia River (Clark, Cowlitz, Pacific, Skamania, and Wahkiakum Counties, WA, and Clatsop, Columbia, and Multnomah Counties, OR) | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cesonia irvingi | Key gnaphosid spider | Spider, Key gnaphosid | J003 | I01 | FL; | Gnaphosidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| ceuthothrombium cavaticum | No common name | No common name | J03E | I01 | neothrombiidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Chaenactis cusickii | No common name | No common name | Q3C2 | P01 | ID, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chaenactis evermannii | No common name | No common name | Q0DW | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chaenactis nevii | No common name | No common name | Q0DX | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chaenactis parishii | Parish's chaenactis | Chaenactis, Parish's | Q0DY | P01 | CA; Mexico (Baja California) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chaenactis ramosa | No common name | No common name | Q0DZ | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chaenactis thompsonii | No common name | No common name | Q0E0 | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chaeropus ecaudatus | Pig-footed bandicoot | Bandicoot, pig-footed | A030 | V01 | Entire | Peramelidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chaetarthria leechi | Leech's chaetarthrian water scavenger beetle | Water scavenger beetle, Leech's chaetarthrian | I0FB | I01 | CA; | Hydrophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Chaetarthria utahensis | Utah chaetarthrian water scavenger beetle | Water scavenger beetle, Utah chaetarthrian | I0FC | I01 | UT; | Hydrophilidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Chaetocercus berlepschi | Esmeraldas woodstar | Woodstar, Esmeraldas | B0BP | V01 | Ecuador | Trochilidae | Nov 29, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| chaetodipus fallax | Northwestern San Diego pocket mouse | mouse, Northwestern San Diego pocket | A0IV | V01 | heteromyidae | NA | Mammals | 1 | Not Listed | NA | US | V | Wherever found | |
| Chaetomys subspinosus | Thin-spined porcupine | Porcupine, thin-spined | A021 | V01 | Wherever found | Erethizontidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chaetopappa hersheyi | Mat leastdaisy | Leastdaisy, mat | Q0E1 | P01 | NM, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chaetura vauxi | Vaux's swift | swift,Vaux's | B0NA | V01 | apodidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Chamaechaenactis scaposa | No common name | No common name | Q0E2 | P01 | CO, ID, UT; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Chamaecrista glandulosa var. mirabilis | No common name | No common name | Q26W | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Fabaceae | Apr 05, 1990 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chamaecrista lineata keyensis | Big Pine partridge pea | Pea, Big Pine partridge | Q0E3 | P01 | FL; | Fabaceae | Oct 31, 2016 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chamaerhodos nuttallii keweenawensis | No common name | No common name | Q30S | P01 | MI; | Rosaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Chamaesyce arnottiana | `Akoko | `Akoko | Q2SA | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce atrococca | `Akoko | `Akoko | Q2SB | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce celastroides stokesii | No common name | No common name | Q0E4 | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce celastroides tomentella | `Akoko | `Akoko | Q2SC | P01 | HI; Possibly extinct,last observed in the 1920's. | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce chaetocalyx triligulata | Three-tongued spurge | Spurge, three-tongued | Q0E5 | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Chamaesyce cumulicola | No common name | No common name | Q0E6 | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chamaesyce deltoidea pinetorum | Pineland sandmat | Sandmat, pineland | Q3HI | P01 | FL; | Euphorbiaceae | Oct 06, 2017 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Chamaesyce deltoidea serpyllum | Wedge spurge | Spurge, wedge | Q0E7 | P01 | FL; | Euphorbiaceae | Oct 31, 2016 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chamaesyce deltoidea ssp. deltoidea | Deltoid spurge | Spurge, deltoid | Q26X | P01 | FL; U.S.A. (FL) | Euphorbiaceae | Jul 18, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chamaesyce garberi | Garber's spurge | Spurge, Garber's | Q1U9 | P01 | FL; U.S.A. (FL) | Euphorbiaceae | Jul 18, 1985 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Chamaesyce golondrina | Swallow spurge | Spurge, swallow | Q0E8 | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Chamaesyce hooveri | Hoover's spurge | Spurge, Hoover's | Q0E9 | P01 | CA; U.S.A. (CA) | Euphorbiaceae | Mar 26, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Chamaesyce jejuna | No common name | No common name | Q0UE | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chamaesyce multiformis multiformis | No common name | No common name | Q2SD | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce ocellata rattanii | No common name | No common name | Q3I4 | P01 | CA; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chamaesyce olowaluana | `Akoko | `Akoko | Q30U | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce perennans | Perennial spurge | Spurge, perennial | Q0EA | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chamaesyce platysperma | Flat-seeded spurge | Spurge, flat-seeded | Q0EB | P01 | AZ, CA; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Chamaesyce porteriana keyensis | Porter's, Key spurge | Spurge, Porter's, Key | Q0EC | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chamaesyce porteriana porteriana | No common name | No common name | Q0ED | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chamaesyce porteriana scoparia | Porter's, spurge | Spurge, Porter's, | Q0EE | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chamaesyce remyi hanaleiensis | `Akoko | `Akoko | Q1UB | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce skottsbergii vaccinioides | `Akoko | `Akoko | Q2SE | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chamaesyce sparsiflora | `Akoko | `Akoko | Q2SF | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Channa argus | northern snakehead | snakehead, northern | E0BA | V01 | Channidae | NA | Fishes | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Charadrius melodus | Piping Plover | Plover, piping | B079 | V01 | IL, IN, MI, MN, NY, OH, PA, WI; Canada (Great Lakes-Ontario); U.S.A. (Great Lakes, Northern Great Plains, Atlantic and Gulf Coasts, PR, VI), Canada, Mexico, Bahamas, West Indies | Charadriidae | Dec 11, 1985 | Birds | 3 | Endangered | 3, 5 | US/Foreign | V | [Great Lakes watershed DPS] - Great Lakes, watershed in States of IL, IN, MI, MN, NY, OH, PA, and WI and Canada (Ont.) |
| Charadrius melodus | Piping Plover | Plover, piping | B079 | V02 | AL, AR, CO, CT, DE, FL, GA, IA, KS, LA, MA, MD, ME, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OK, RI, SC, SD, TX, VA, WY; Canada,Mexico,West Indies; U.S.A. (Great Lakes, Northern Great Plains, Atlantic and Gulf Coasts, PR, VI), Canada, Mexico, Bahamas, West Indies | Charadriidae | Dec 11, 1985 | Birds | 5 | Threatened | 2, 3, 4, 5, 6 | US/Foreign | V | [Atlantic Coast and Northern Great Plains populations] - Wherever found, except those areas where listed as endangered. |
| Charadrius montanus | Mountain plover | Plover, mountain | B078 | V01 | CO, MT, UT; | Charadriidae | NA | Birds | 6 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Charadrius nivosus nivosus | Western snowy plover | Plover, western snowy | B07C | V01 | CA, OR, WA; Mexico (Baja CA) (Pacific coast population only); Pacific Coast population DPS-U.S.A. (WA, OR, CA), Mexico | Charadriidae | Mar 05, 1993 | Birds | 8 | Threatened | 1, 8 | US/Foreign | V | Pacific Coast population DPS-U.S.A. (CA, OR, WA), Mexico (within 50 miles of Pacific coast) |
| Charina bottae umbratica | Southern rubber boa | Boa, southern rubber | C03B | V01 | CA; | Boidae | NA | Reptiles | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Charina trivirgata | Rosy boa | Boa, rosy | C05P | V01 | AZ, CA; | Boidae | NA | Reptiles | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Charina trivirgata roseofusca | Coastal rosy boa | Boa, coastal rosy | C058 | V01 | CA; | Boidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Charpentiera densiflora | Papala | Papala | Q0EF | P01 | HI; U.S.A. (HI) | Amaranthaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Chasiempis ibidis | Oahu elepaio | elepaio, Oahu | B0AL | V01 | HI; U.S.A. (HI) | Monarchidae | Apr 18, 2000 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Chasmistes brevirostris | Shortnose Sucker | Sucker, shortnose | E055 | V01 | CA, OR; The range of the shortnose sucker includes lakes and lower tributaries of the upper Klamath River basin in Oregon and California, including Upper Klamath Lake, and its major tributaries (primarily the Sprague and Williamson rivers); Clear Lake and its tributaries Boles, Fletcher and Willow creeks and associated smaller reservoirs, Gerber Reservoir and several of its tributaries Barnes Valley and Ben Hall creeks; most of the Lost River; Tule Lake; and the Klamath River from Lake Ewauna to Iron Gate Dam. Historically the species was present in Lower Klamath Lake but the species is not believed to be resident currently. ; U.S.A. (OR, CA) | Catostomidae | Jul 18, 1988 | Fishes | 8 | Endangered | 1, 8 | US | V | Wherever found |
| Chasmistes cujus | Cui-ui | Cui-ui | E001 | V01 | CA, NV; U.S.A. (NV) | Catostomidae | Mar 11, 1967 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Chasmistes fecundus | Webug sucker | Sucker, Webug | E058 | V01 | UT; | Catostomidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Wherever found |
| Chasmistes liorus | June sucker | Sucker, June | E050 | V01 | UT; U.S.A. (UT) | Catostomidae | Mar 31, 1986 | Fishes | 6 | Endangered | 6 | US | V | Wherever found |
| Chasmistes muriei | Snake River sucker | Sucker, Snake River | E09R | V01 | WY; Believed to be extinct | Catostomidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Wherever found |
| Cheilanthes arizonica californicum | Canyon lip fern | Fern, Canyon lip | S004 | P01 | AZ; | Adiantaceae | NA | Ferns and Allies | 2 | Not Listed | 2 | US | P | Wherever found |
| Cheilanthes fibrillosa | Fibrillose lip fern | Lip fern, fibrillose | S005 | P01 | CA; | Adiantaceae | NA | Ferns and Allies | 1 | Not Listed | 8 | US | P | Wherever found |
| Cheilanthes pringlei insulare | Pringle lip fern | Fern, Pringle lip | S006 | P01 | AZ; | Adiantaceae | NA | Ferns and Allies | 2 | Not Listed | 2 | US | P | Wherever found |
| Cheilolejeunea evansii | No common name | No common name | Q30V | P01 | NC, SC; Possibly extinct | Lejeuneaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| cheiridium reyesi | No common name | No common name | J03F | I01 | cheiridiidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cheirodendron helleri helleri | No common name | No common name | Q0EJ | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cheirodendron helleri microcarpum | No common name | No common name | Q0EK | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cheirodendron helleri sodalium | No common name | No common name | Q0EL | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cheirodendron trigynum rockii | [Unnamed] olapa | Olapa, [unnamed] | Q0EM | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cheirodendron trigynum subcordatum | [Unnamed] olapa | Olapa, [unnamed] | Q0EN | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| chelone cuthbertii | Cuthbert's turtlehead | turtlehead, Cuthbert's | Q3KQ | P01 | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Chelone obliqua speciosa | No common name | No common name | Q0EO | P01 | AR, IA, IL, IN, KY, MI, MO; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V03 | HI; | Cheloniidae | May 06, 2016 | Reptiles | 1 | Threatened | 1 | US | V | Green sea turtles originating from the Central North Pacific Ocean, bounded by the following coordinates: 41 degrees N., 169 degrees E. in the northwest; 41 degrees N., 143 degrees W. in the northeast; 9 degrees N., 125 degrees W. in the southeast; and 9 degrees N., 175 degrees W. in the southwest Pacific coast of Mexico |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V04 | AS; | Cheloniidae | May 06, 2016 | Reptiles | 1 | Endangered | 1 | US | V | Green sea turtles originating from the Central South Pacific Ocean, bounded by the following coordinates: 9 degrees N., 175 degrees W. in the northwest; 9 degrees N., 125 degrees W. in the northeast; 40 degrees S., 96 degrees W. in the southeast; 40 degrees S., 176 degrees E. in the southwest; and 13 degrees S., 171 degrees E. in the west |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V05 | GU, MP, PW; | Cheloniidae | May 06, 2016 | Reptiles | 1 | Endangered | 1 | US | V | Green sea turtles originating from the Central West Pacific Ocean, bounded by the following coordinates: 41 degrees N., 146 degrees E. in the northwest; 41 degrees N., 169 degrees E. in the northeast; 9 degrees N., 175 degrees W. in the east; 13 degrees S., 171 degrees E. in the southeast; along the northern coast of the island of New Guinea; and 4.5 degrees N., 129 degrees E. in the west |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V06 | Cheloniidae | May 06, 2016 | Reptiles | Foreign | Threatened | NA | Foreign | V | Green sea turtles originating from the Eastern Indian and Western Pacific Oceans, bounded by the following lines and coordinates: 41 degrees N. Lat. in the north, 41 degrees N., 146 degrees E. in the northeast; 4.5 degrees N., 129 degrees E. in the southeast; along the southern coast of the island of New Guinea; along the western coast of Australia (west of 142 degrees E. Long.); 40 degrees S. Lat. in the south; and 84 degrees E. Long. in the east | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V07 | Cheloniidae | May 06, 2016 | Reptiles | Foreign | Endangered | NA | Foreign | V | Green sea turtles originating from the Mediterranean Sea, bounded by 5.5 degrees W. Long. in the west | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V08 | Cheloniidae | May 06, 2016 | Reptiles | Foreign | Threatened | NA | Foreign | V | Green sea turtles originating from the North Indian Ocean, bounded by: Africa and Asia in the west and north; 84 degrees E. Long. in the east; and the equator in the south | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V09 | Cheloniidae | May 06, 2016 | Reptiles | Foreign | Threatened | NA | Foreign | V | Green sea turtles originating from the Southwest Indian Ocean, bounded by the following lines: the equator to the north; 84 degrees E. Long. to the east; 40 degrees S. Lat. to the south; and 19 degrees E. Long (and along the eastern coast of Africa) in the west | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V10 | Cheloniidae | May 06, 2016 | Reptiles | Foreign | Threatened | NA | Foreign | V | Green sea turtles originating from the Southwest Pacific Ocean, bounded by the following lines and coordinates: along the southern coast of the island of New Guinea and the Torres Strait (east of 142 degrees E Long.); 13 degrees S., 171 degrees E. in the northeast; 40 degrees S., 176 degrees E. in the southeast; and 40 degrees S., 142 degrees E. in the southwest | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V11 | Cheloniidae | May 06, 2016 | Reptiles | 8 | Threatened | NA | US | V | Green sea turtles originating from the East Pacific Ocean, bounded by the following lines and coordinates: 41 degrees N., 143 degrees W. in the northwest; 41 degrees N. Lat. in the north; along the western coasts of the Americas; 40 degrees S. Lat. in the south; and 40 degrees S., 96 degrees W. in the southwest | |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V12 | FL, NC, SC, TX, VA; | Cheloniidae | May 06, 2016 | Reptiles | 4 | Threatened | 2, 4, 5 | US | V | Green sea turtles originating from the North Atlantic Ocean, bounded by the following lines and coordinates: 48 degrees N. Lat. in the north, along the western coasts of Europe and Africa (west of 5.5 degrees W. Long.); north of 19 degrees N. Lat. in the east; bounded by 19 degrees N., 65.1 degrees W. to 14 degrees N., 65.1 degrees W. then 14 degrees N., 77 degrees W. in the south and west; and along the eastern coasts of the Americas (north of 7.5 degrees N., 77 degrees W.) |
| Chelonia mydas | Green sea turtle | Sea turtle, green | C00S | V13 | Cheloniidae | May 06, 2016 | Reptiles | 4 | Threatened | NA | US | V | Green sea turtles originating from the South Atlantic Ocean, bounded by the following lines and coordinates: along the northern and eastern coasts of South America (east of 7.5 degrees N., 77 degrees W.); 14 degrees N., 77 degrees W. to 14 degrees N., 65.1 degrees W. to 19 degrees N., 65.1 degrees W. in the north and west; 19 degrees N. Lat. in the northeast; 40 degrees S., 19 degrees E. in the southeast; and 40 degrees S. Lat. in the south | |
| Chenopodium cycloides | Sandhill goosefoot | Goosefoot, sandhill | Q3C3 | P01 | CO, KS, NM, TX; | Chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Chenopodium oahuense | Molokai goosefoot | Goosefoot, Molokai | Q0EQ | P01 | HI; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chenopodium oahuense discospermum | No common name | No common name | Q0EP | P01 | HI; | Chenopodiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chersodromia hawaiiensis | Hawaiian chersodromian dance fly | Dance fly, Hawaiian chersodromian | I068 | I01 | HI; Possibly extinct,not reported since 1965 | Empididae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Cheumatopsyche flinti | Flint's net-spinning caddisfly | Caddisfly, Flint's net-spinning | I03Q | I01 | TX; | Hydropsychidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cheumatopsyche helma | Helma's net-spinning caddisfly | Caddisfly, Helma's net-spinning | I03V | I01 | KY, ME, PA, TN; | Hydropsychidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Cheumatopsyche morsei | Morse's net-spinning caddisfly | Caddisfly, Morse's net-spinning | I0N3 | I01 | LA; | Hydropsychidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Cheumatopsyche vannotei | Vannote's net-spinning caddisfly | Caddisfly, Vannote's net-spinning | I04G | I01 | PA; Possibly extinct,not reported since 1965 | Hydropsychidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Chiloscyphus gemmiparus | No common name | No common name | Q3LS | P01 | Geocalycaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Chilostigma itascae | Headwater chilostigman caddisfly | Caddisfly, headwater chilostigman | I0IY | I01 | MN; | Limnephilidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Chimarra holzenthali | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0N6 | I01 | LA; | Philoptamidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Chinchilla brevicaudata boliviana | Chinchilla | Chinchilla | A052 | V01 | Entire | Chinchillidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chionactis occipitalis klauberi | Tucson shovel-nosed Snake | Snake, Tucson shovel-nosed | C06D | V01 | AZ; | Colubridae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Chionactis occipitalis klauberi | Tucson shovel-nosed snake | snake, Tucson shovel-nosed | C06Z | V01 | colubridae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Chionanthus pygmaeus | Pygmy fringe-tree | Fringe-tree, pygmy | Q26Y | P01 | FL; U.S.A. (FL) | Oleaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chiropotes albinasus | White-nosed saki | Saki, white-nosed | A027 | V01 | Wherever found | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chiropotes satanas satanas | Southern bearded saki | Saki, southern bearded | A0FN | V01 | Wherever found | Cebidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| chitrella elliotti | No common name | No common name | J03G | I01 | syarinidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| chitrella major | No common name | No common name | J03H | I01 | syarinidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Chitrella regina | Royal syarinid pseudoscorpion | Pseudoscorpion, royal syarinid | J00K | I01 | WV; | Syarinidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| chitrella welbourni | No common name | No common name | J03I | I01 | syarinidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| chitrellina chiricahuae | No common name | No common name | J03J | I01 | syarinidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Chlamyphorus truncatus | Pink fairy armadillo | Armadillo, pink fairy | A00L | V01 | Entire | Dasypodidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chlidonias niger | Black tern | Tern, black | B09F | V01 | CA, CO, IA, ID, IL, IN, KS, ME, MI, MN, MO, MT, ND, NE, NV, NY, OH, OR, SD, UT, WA, WI, WY; | Laridae | NA | Birds | 6 | Not Listed | 1, 3, 5, 6, 8 | US/Foreign | V | Wherever found |
| Chloealtis aspasma | Siskiyou chloealtis grasshopper | Grasshopper, Siskiyou chloealtis | I079 | I01 | OR; | Acrididae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Chloris texensis | Texas windmill grass | Grass, Texas windmill | Q0ER | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chlorochroa belfragii | Belfragi's chlorochroan bug | Bug, Belfragi's chlorochroan | I0MY | I01 | IA, IL, NE, SD; | Pentatomidae | NA | Insects | 3 | Not Listed | 3, 6 | US | I | Wherever found |
| Chlorochroa dismalia | Dismal Swamp chlorochroan bug | Bug, Dismal Swamp chlorochroan | I0IP | I01 | VA; Possibly extinct,not reported since 1965 | Pentatomidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Chlorochroa rita | Santa Rita Mountains chlorochroan bug | Bug, Santa Rita Mountains chlorochroan | I0IQ | I01 | AZ; | Pentatomidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Chlorogalum grandiflorum | Red Hills soaproot | Soaproot, Red Hills | Q0ES | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chlorogalum purpureum | Purple amole | amole, purple | Q0ET | P01 | CA; U.S.A. (FL) | Agavaceae | Mar 20, 2000 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Chlosyne acastus robusta | Spring Mountains acastus checkerspot butterfly | Butterfly, Spring Mountains acastus checkerspot | I0N5 | I01 | NV; | Nymphalidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Chlosyne leanira osoflaco | Oso Flaco patch butterfly | Butterfly, Oso Flaco patch | I0IT | I01 | CA; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Choeronycteris mexicana | Mexican long-tongued bat | Bat, Mexican long-tongued | A0GS | V01 | AZ, CA, NM, TX; Mexico,Central & South America | Phyllostomidae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Choisya arizonica | Arizona star leaf | Star leaf, Arizona | Q0EV | P01 | AZ; | Rutaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Choisya mollis | Santa Cruz star leaf | Star leaf, Santa Cruz | Q0EW | P01 | AZ; | Rutaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chondrohierax uncinatus mirus | Grenada hook-billed kite | Kite, Grenada hook-billed | B01Z | V01 | West Indies-Grenada | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chondrohierax uncinatus wilsonii | Cuba hook-billed kite | Kite, Cuba hook-billed | B03U | V01 | West Indies-Cuba | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| chordeiles acutipennis | Lesser nighthawk | nighthawk, Lesser | B0EL | V01 | caprimulgidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Chorizanthe biloba immemora | San Benito spineflower | Spineflower, San Benito | Q30W | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe blakleyi | Blakley's spineflower | Spineflower, Blakley's | Q26Z | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe breweri | Brewer's spineflower | Spineflower, Brewer's | Q0EX | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe cuspidata cuspidata | San Francisco Bay spineflower | Spineflower, San Francisco Bay | Q30X | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe howellii | Howell's spineflower | Spineflower, Howell's | Q270 | P01 | CA; U.S.A. (FL) | Polygonaceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chorizanthe leptotheca | Ramona spineflower | spineflower, Ramona | Q3KZ | P01 | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Chorizanthe orcuttiana | Orcutt's spineflower | Spineflower, Orcutt's | Q0EY | P01 | CA; U.S.A. (CA) | Polygonaceae | Oct 07, 1996 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chorizanthe parryi parryi | Parry's spineflower | Spineflower, Parry's | Q30Z | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe parryi var. fernandina | San Fernando Valley Spineflower | Spineflower, San Fernando Valley | Q0EZ | P01 | CA; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Entire |
| Chorizanthe polygonoides longispina | No common name | No common name | Q3C4 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| chorizanthe procumbens | Prostrate spineflower | spineflower, Prostrate | Q3JY | P01 | polygonaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Chorizanthe pungens var. hartwegiana | Ben Lomond spineflower | Spineflower, Ben Lomond | Q30Y | P01 | CA; U.S.A. (CA) | Polygonaceae | Feb 04, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chorizanthe pungens var. pungens | Monterey spineflower | Spineflower, Monterey | Q271 | P01 | CA; U.S.A. (CA) | Polygonaceae | Feb 04, 1994 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Chorizanthe rectispina | One-awned spineflower | Spineflower, one-awned | Q0F0 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe robusta var. hartwegii | Scotts Valley spineflower | spineflower, Scotts Valley | Q3IB | P01 | CA; U.S.A. (CA) | Polygonaceae | Feb 04, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chorizanthe robusta var. robusta | Robust spineflower | spineflower, Robust | Q3O7 | P01 | CA; U.S.A. (CA) | Polygonaceae | Feb 04, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chorizanthe spinosa | Mojave spineflower | Spineflower, Mojave | Q0F1 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe staticoides chrysacantha | Turkish rugging | Turkish rugging | Q0F2 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chorizanthe valida | Sonoma spineflower | Spineflower, Sonoma | Q1UF | P01 | CA; U.S.A. (CA) | Polygonaceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Chromolaena borinquensis | No common name | No common name | Q0TZ | P01 | PR, VI; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chromolaena frustrata | Cape Sable Thoroughwort | Thoroughwort, Cape Sable | Q3HJ | P01 | FL; | Asteraceae | Nov 25, 2013 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chromolaena oteroi | No common name | No common name | Q0U2 | P01 | PR, VI; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chrosomus saylori | Laurel dace | dace, Laurel | E0AR | V01 | TN; U.S.A. (TN) | Cyprinidae | Sep 08, 2011 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Chrosomus sp. cf. saylori | Clinch dace | Dace, Clinch | E0DH | V01 | Cyprinidae | NA | Fishes | 5 | Under Review in the Candidate or Petition Process | NA | US | V | Entire | |
| Chrysocyon brachyurus | Maned wolf | Wolf, maned | A03U | V01 | Uruguay, Paraguay, Brazil, Bolivia, Argentina | Canidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Chrysophyllum cainito | No common name | No common name | Q3C5 | P01 | PR, VI; | Sapotaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chrysopsis floridana | Florida golden aster | Aster, Florida golden | Q272 | P01 | FL; Known to occur in scrub habitat in Hardee, Hillsborough, Manatee, and Pinellas Counties in Florida. Most sites are on conservation lands with the exception of Hardee County where all the sites are on private lands.; U.S.A. (FL) | Asteraceae | May 16, 1986 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Chrysopsis godfreyi | Godfrey's golden aster | Aster, Godfrey's golden | Q310 | P01 | AL, FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chrysopsis gossypina cruiseana | Cruise's golden aster | Aster, Cruise's golden | Q311 | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Chrysosplenium iowense | No common name | No common name | Q2SG | P01 | IA, MN; | Saxifragaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Chrysothamnus eremobius | No common name | No common name | Q312 | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Chrysothamnus molestus | No common name | No common name | Q2SH | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chrysothamnus nauseosus nanus | No common name | No common name | Q273 | P01 | ID, OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Chrysothamnus nauseosus texensis | No common name | No common name | Q2SI | P01 | NM, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chrysothamnus parryi hinckleyi | No common name | No common name | Q3I3 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Chrysothamnus scopulorum | No common name | No common name | Q2AV | P01 | AZ, UT; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Cichlherminia iherminieri santaeluciae | St. Lucia Forest thrush | Thrush, St. Lucia Forest | B0D4 | V01 | West Indies - St. Lucia | Muscicapidae | Sep 16, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cicindela albissima | Coral Pink Sand Dunes tiger beetle | Tiger beetle, Coral Pink Sand Dunes | I0EW | I01 | UT; test | Cicindelidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Cicindela arenicola | Idaho dunes tiger beetle | Tiger beetle, Idaho dunes | I0ES | I01 | ID; | Cicindelidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Cicindela cazieri | Cazier's tiger beetle | Tiger beetle, Cazier's | I0ET | I01 | TX; Possibly extinct,not reported since 1965 | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela chlorocephala smythi | Smyth's tiger beetle | Tiger beetle, Smyth's | I0EU | I01 | TX; Possibly extinct,not reported since 1965 | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela columbica | Columbia River tiger beetle | Tiger beetle, Columbia River | I01R | I01 | ID, OR, WA; | Cicindelidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Cicindela dorsalis dorsalis | Northeastern beach tiger beetle | Tiger beetle, Northeastern beach | I02C | I01 | MA, MD, NJ, VA; U.S.A. (VA, RI, PA, NY, NJ, MD, MA, CT) | Cicindelidae | Aug 07, 1990 | Insects | 5 | Threatened | 5 | US | I | Wherever found |
| Cicindela hirticollis abrupta | Sacramento Valley tiger beetle | Tiger beetle, Sacramento Valley | I0ON | I01 | CA; | Cicindelidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Cicindela hirticollis gravida | Sandy beach tiger beetle | Tiger beetle, sandy beach | I0OO | I01 | CA; | Cicindelidae | NA | Insects | 1 | Not Listed | 8 | US/Foreign | I | Wherever found |
| Cicindela latesignata obliviosa | Oblivious tiger beetle | Tiger beetle, oblivious | I0EV | I01 | CA; Possibly extinct,not reported since 1965 | Cicindelidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cicindela marginipennis | Cobblestone tiger beetle | Tiger beetle, cobblestone | I0EX | I01 | AL, DE, IN, MS, NH, NJ, NY, OH, PA, VT, WV; | Cicindelidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | I | Wherever found |
| Cicindela nevadica lincolniana | Salt Creek Tiger beetle | Tiger beetle, Salt Creek | I0QR | I01 | NE; U.S.A. (NE) | Cicindelidae | Oct 06, 2005 | Insects | 6 | Endangered | 6 | US | I | Wherever found |
| Cicindela nevadica olmosa | Los Olmos tiger beetle | Tiger beetle, Los Olmos | I0EY | I01 | NM, TX; | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Cicindela nigrocoerulea subtropica | Subtropical blue-black tiger beetle | Tiger beetle, subtropical blue-black | I0EZ | I01 | TX; | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela obsoleta neojuvenilis | Neojuvenile tiger beetle | Tiger beetle, neojuvenile | I0F0 | I01 | TX; Possibly extinct,not reported since 1965 | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela ohlone | Ohlone tiger beetle | Tiger beetle, Ohlone | I0OW | I01 | CA; U.S.A. (CA) | Cicindelidae | Oct 03, 2001 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Cicindela oregona maricopa | Maricopa tiger beetle | Tiger beetle, Maricopa | I0M7 | I01 | AZ; | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela politula barbarannae | Barbara Ann's tiger beetle | Tiger beetle, Barbara Ann's | I0I7 | I01 | TX; | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela politula petrophila | Guadalupe Mountains tiger beetle | Tiger beetle, Guadalupe Mountains | I0I8 | I01 | TX; | Cicindelidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicindela puritana | Puritan tiger beetle | Tiger beetle, Puritan | I02D | I01 | CT, MA, MD; U.S.A. (VT, NH, MD, MA, CT) | Cicindelidae | Aug 07, 1990 | Insects | 5 | Threatened | 5 | US | I | Wherever found |
| Cicindela theatina | Great Sand Dunes Tiger Beetle | Tiger Beetle, Great Sand Dunes | I0XC | I01 | Carabidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicindela tranquebarica ssp. | San Joaquin tiger beetle | Tiger beetle, San Joaquin | I0OP | I01 | CA; | Cicindelidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cicindela tranquebarica viridissima | Greenest tiger beetle | Tiger beetle, greenest | I0F1 | I01 | CA; | Cicindelidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cicindelidia floridana | Miami tiger beetle | Tiger beetle, Miami | I0XA | I01 | FL; | Carabidae | Nov 04, 2016 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Cicindelidia highlandensis | Highlands tiger beetle | Tiger beetle, highlands | I0MR | I01 | FL; Highlands County and Polk County, FL | Cicindelidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ciconia boyciana (=ciconia b.) | Oriental white stork | Stork, oriental white | B03C | V01 | China,Japan,North Korea,South Korea,U.S.S.R | Ciconiidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cicurina bandida | Bandit Cave spider | Spider, Bandit Cave | J017 | I01 | TX; | Dictynidae | NA | Arachnids | 2 | Not Listed | 2 | US | I | Wherever found |
| Cicurina baronia | Robber Baron Cave Meshweaver | Meshweaver, Robber Baron Cave | J01A | I01 | TX; U.S.A. (TX) | Dictynidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| cicurina barri | No common name | No common name | J03K | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina browni | No common name | No common name | J03L | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina caverna | No common name | No common name | J03M | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina coryelli | No common name | No common name | J01S | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicurina cueva | [Unnamed] spider | Spider, [unnamed] | J015 | I01 | TX; | Dictynidae | NA | Arachnids | 2 | Not Listed | 2 | US | I | Wherever found |
| cicurina ezelli | No common name | No common name | J01T | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina gruta | No common name | No common name | J01U | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina holsingeri | No common name | No common name | J01V | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina machete | No common name | No common name | J01W | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicurina madla | Madla Cave Meshweaver | Meshweaver, Madla Cave | J019 | I01 | TX; U.S.A. (TX) | Dictynidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| cicurina mckenziei | No common name | No common name | J01X | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina medina | No common name | No common name | J01Y | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina menardia | No common name | No common name | J01Z | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina obscura | No common name | No common name | J020 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina orellia | No common name | No common name | J021 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina pablo | No common name | No common name | J022 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina pastura | No common name | No common name | J023 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina patei | No common name | No common name | J024 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina porteri | No common name | No common name | J025 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina puentecilla | No common name | No common name | J026 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina rainesi | No common name | No common name | J027 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina reclusa | No common name | No common name | J028 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina reddelli | No common name | No common name | J029 | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina reyesi | No common name | No common name | J02A | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina russelli | No common name | No common name | J02B | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina sansaba | No common name | No common name | J02C | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina selecta | No common name | No common name | J02D | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina serena | No common name | No common name | J02E | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina sheari | No common name | No common name | J02F | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina sprousei | No common name | No common name | J02G | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina stowersi | No common name | No common name | J02I | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina suttoni | No common name | No common name | J02J | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina travisae | No common name | No common name | J02K | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina ubicki | No common name | No common name | J02L | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina uvalde | No common name | No common name | J02M | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| cicurina venefica | No common name | No common name | J02N | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicurina venii | Braken Bat Cave Meshweaver | Meshweaver, Braken Bat Cave | J01D | I01 | TX; U.S.A. (TX) | Dictynidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| Cicurina vespera | Government Canyon Bat Cave Meshweaver | Meshweaver, Government Canyon Bat Cave | J01B | I01 | TX; U.S.A. (TX) | Dictynidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| cicurina vibora | No common name | No common name | J02O | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicurina wartoni | Warton cave meshweaver | Meshweaver, Warton cave | J01C | I01 | TX; | Dictynidae | NA | Arachnids | 2 | Not Listed | 2 | US | I | Wherever found |
| cicurina watersi | No common name | No common name | J02P | I01 | dictynidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Cicuta bolanderi | Bolander water-hemlock | Water-hemlock, Bolander | Q0F3 | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cimicifuga arizonica | Arizona bugbane | Bugbane, Arizona | Q0F4 | P01 | AZ; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cimicifuga elata | Tall bugbane | Bugbane, Tall | Q3C7 | P01 | OR, WA; Canada (B.C.) | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US/Foreign | P | Wherever found |
| Cimicifuga laciniata | No common name | No common name | Q0F5 | P01 | OR, WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cimicifuga rubifolia | No common name | No common name | Q0F6 | P01 | AL, IL, IN, KY, TN, VA; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Cincinnatia helicogyra | Crystal siltsnail | Siltsnail, crystal | G034 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Cincinnatia monroensis | Enterprise siltsnail | Siltsnail, Enterprise | G035 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Cincinnatia parva | Pygmy siltsnail | Siltsnail, pygmy | G038 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cincinnatia ponderosa | Ponderous siltsnail | Siltsnail, ponderous | G037 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cincinnatia vanhyningi | Seminole siltsnail | Siltsnail, Seminole | G039 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Cincinnatia wekiwae | Wekiwa siltsnail | Siltsnail, Wekiwa | G03A | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Cinclocerthia ruficauda gutturalis | Martinique trembler (thrasher) | Trembler, Martinique (thrasher) | B03F | V01 | Martinique | Mimidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cinclodes aricomae | Royal cinclodes | Cinclodes, royal | B0BM | V01 | Bolivia, Peru | Furnariidae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cinclus mexicanus unicolor | American Dipper | Dipper, American | B0DN | V01 | Cinclidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| circus cyaneus | Northern harrier | harrier, Northern | B0EM | V01 | accipitridae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Cirsium brevifolium | Thistle | Thistle | Q274 | P01 | ID, OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cirsium ciliolatum | Ashland thistle | Thistle, Ashland | Q0F7 | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cirsium clokeyi | Clokey's thistle | Thistle, Clokey's | Q0F8 | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium crassicaule | Slough thistle | Thistle, slough | Q0F9 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium davisii | [Unnamed] thistle | Thistle, [unnamed] | Q0FA | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cirsium fontinale campylon | Mt. Hamilton thistle | Thistle, Mt. Hamilton | Q0FB | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium fontinale var. fontinale | Fountain thistle | Thistle, fountain | Q1UH | P01 | CA; U.S.A. (CA) | Asteraceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cirsium fontinale var. obispoense | Chorro Creek bog thistle | Thistle, Chorro Creek bog | Q1UG | P01 | CA; U.S.A. (CA) | Asteraceae | Dec 15, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cirsium hallii | [Unnamed] thistle | Thistle, [unnamed] | Q275 | P01 | CA, NV, OR, UT; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Cirsium hillii | [Unnamed] thistle | Thistle, [unnamed] | Q2SJ | P01 | IA, IL, IN, MI, MN, OH, PA, WI; Canada (Ont.) | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US/Foreign | P | Wherever found |
| Cirsium hydrophilum var. hydrophilum | Suisun thistle | Thistle, Suisun | Q0FC | P01 | CA; U.S.A. (CA) | Asteraceae | Nov 20, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cirsium hydrophilum vaseyi | Mt. Tamalpais thistle | Thistle, Mt. Tamalpais | Q0FD | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium loncholepis | La Graciosa thistle | Thistle, La Graciosa | Q0FE | P01 | CA; U.S.A. (CA) | Asteraceae | Mar 20, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cirsium longistylum | [Unnamed] thistle | Thistle, [unnamed] | Q314 | P01 | MT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cirsium mohavense | Virgin thistle | Thistle, Virgin | Q2O5 | P01 | AZ, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Cirsium occidentale compactum | Compact cobweb thistle | Thistle, compact cobweb | Q2O4 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium ownbeyi | Ownbey's thistle | Thistle, Ownbey's | Q2SK | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cirsium parryi mogollonicum | Mogollon thistle | Thistle, Mogollon | Q3C8 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cirsium pitcheri | Pitcher's thistle | Thistle, Pitcher's | Q276 | P01 | IL, IN, MI, WI; Canada (Ont.); U.S.A. (WI, MI, IL, IN), Canada (Ont.) | Asteraceae | Jul 18, 1988 | Flowering Plants | 3 | Threatened | 3 | US/Foreign | P | Wherever found |
| Cirsium rhothophilum | Surf thistle | Thistle, surf | Q0FF | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cirsium rydbergii | [Unnamed] thistle | Thistle, [unnamed] | Q0FG | P01 | AZ, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Cirsium scapanolepis | Mountain-slope Thistle | Thistle Mountain-slope | Q3LT | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Cirsium sp. | Sp. nov. ined. cirsium | Cirsium, sp. nov. ined. | Q3C9 | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | R6 |
| Cirsium turneri | [Unnamed] thistle | Thistle, [unnamed] | Q0FH | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cirsium vinaceum | Sacramento Mountains thistle | Thistle, Sacramento Mountains | Q277 | P01 | NM; U.S.A. (NM) | Asteraceae | Jun 16, 1987 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Cirsium wrightii | Wright's marsh thistle | Thistle, Wright's marsh | Q3N3 | P01 | AZ, NM; | Asteraceae | NA | Flowering Plants | 2 | Candidate | 2 | US/Foreign | P | Wherever found |
| Cistanthe tweedyi | Tweedy's pussypaws | Pussypaws, Tweedy's | Q13T | P01 | WA; Canada (B.C.) | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| cisthene conjuncta | No common name | No common name | I0UJ | I01 | arctiidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Cladonia perforata | Florida perforate cladonia | Cladonia, Florida perforate | U000 | P01 | FL; U.S.A. (FL) | Cladoniaceae | Apr 27, 1993 | Lichens | 4 | Endangered | 4 | US | P | Wherever found |
| Cladonia psoromica | Bluff Mountain Reindeer Lichen | Lichen, Bluff Mountain Reindeer | U003 | P01 | NC; | Cladoniaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | Wherever found |
| Cladrastis kentukea | No common name | No common name | Q0FI | P01 | AL, AR, GA, IL, IN, KY, MO, MS, NC, OK, SC, TN; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Clangula hyemalis | Long-tailed duck | Duck, long-tailed | B0B1 | V01 | Anatidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| claopodium whippleanum | Whipple's claopodium moss | moss, Whipple's claopodium | U008 | P01 | leskeaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Claoxylon sandwicense sandwicense | Po`ola | Po`ola | Q0FJ | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clappia cahabensis | Cahaba pebblesnail | Pebblesnail, Cahaba | G0BY | I01 | AL; Believed to be extinct | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Clappia umbilicata | Cahaba pebblesnail | Pebblesnail, Cahaba | G0BZ | I01 | AL; Believed to be extinct | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Clarkia amoena pacifica | [Unnamed] clarkia | Clarkia, [unnamed] | Q0FK | P01 | OR, WA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clarkia amoena whitneyi | [Unnamed] clarkia | Clarkia, [unnamed] | Q278 | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia australis | Small's southern clarkia | Clarkia, Small's southern | Q0FL | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia biloba australis | Mariposa clarkia | Clarkia, Mariposa | Q0FM | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia borealis arida | Arid northern clarkia | Clarkia, arid northern | Q0FN | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia concinna automixa | East Bay clarkia | Clarkia, East Bay | Q3CA | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia concinna raichei | Tomales clarkia | Clarkia, Tomales | Q3CB | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia franciscana | Presidio clarkia | Clarkia, Presidio | Q1UI | P01 | CA; U.S.A. (CA) | Onagraceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Clarkia imbricata | Vine Hill clarkia | Clarkia, Vine Hill | Q0FO | P01 | CA; U.S.A. (CA) | Onagraceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Clarkia lingulata | Merced clarkia | Clarkia, Merced | Q0FP | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia mosquinii mosquinii | Mosquin's clarkia | Clarkia, Mosquin's | Q0FQ | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia mosquinii xerophila | Enterprise clarkia | Clarkia, Enterprise | Q0FR | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia rostrata | Beaked clarkia | Clarkia, beaked | Q0FS | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clarkia speciosa ssp. immaculata | Pismo clarkia | Clarkia, Pismo | Q1UJ | P01 | CA; U.S.A. (CA) | Onagraceae | Dec 15, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Clarkia springvillensis | Springville clarkia | Clarkia, Springville | Q2O6 | P01 | CA; U.S.A. (CA) | Onagraceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Clarkia tembloriensis ssp. calientensis | Caliente clarkia | Clarkia, Caliente | Q2SL | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clavicoccus erinaceus | Oahu abutilon clavicoccus mealybug | Mealybug, Oahu abutilon clavicoccus | I0PL | I01 | HI; Possibly extinct,not reported since 1965 | Pseudococcidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Clavicoccus tribulus | Oahu ke`oke`o clavicoccus mealybug | Mealybug, Oahu ke`oke`o clavicoccus | I0PM | I01 | HI; | Pseudococcidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Claytonia lanceolata chrysantha | No common name | No common name | Q0FV | P01 | WA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Claytonia lanceolata flava | No common name | No common name | Q0FT | P01 | ID, MT, WY; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Claytonia lanceolata peirsonii | Peirson's spring beauty | Spring beauty, Peirson's | Q0FU | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Claytonia megarhiza bellidiflora | Fell fields claytonia | Claytonia, fell fields | Q279 | P01 | CA, OR; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Claytonia megarhiza nivalis | No common name | No common name | Q0FW | P01 | WA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Claytonia virginica hammondiae | [Unnamed] spring-beauty | Spring-beauty, [unnamed] | Q3CC | P01 | DE, NJ; | Portulacaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Clematis addisonii | Addison's virgin's bower | Virgin's bower, Addison's | Q0FX | P01 | VA; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Clematis albicoma | White-haired leatherflower | Leatherflower, white-haired | Q27A | P01 | VA, WV; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Clematis catesbyana | Old man's beard | Old man's beard | Q0G0 | P01 | FL; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Clematis hirsutissima arizonica | Arizona leatherflower | Leatherflower, Arizona | Q0FZ | P01 | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Clematis morefieldii | Morefield's leather flower | Leather flower, Morefield's | Q315 | P01 | AL, TN; U.S.A. (AL) | Ranunculaceae | May 20, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Entire |
| Clematis occidentalis dissecta | [Unnamed] leather flower | Leather flower, [unnamed] | Q0G1 | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clematis socialis | Alabama leather flower | Leather flower, Alabama | Q2SM | P01 | AL, GA; U.S.A. (AL) | Ranunculaceae | Sep 26, 1986 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Clematis viorna | [Unnamed] virgin's bower | Virgin's bower, [unnamed] | Q0FY | P01 | AL, TN; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Clematis viticaulis | Millboro leatherflower | Leatherflower, Millboro | Q0G2 | P01 | VA; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Clemmys guttata | Spotted turtle | Turtle, spotted | C07A | V01 | FL, GA, SC; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US/Foreign | V | Wherever found |
| Clemmys muhlenbergii | bog turtle | turtle, bog | C048 | V01 | CT, DE, MA, MD, NJ, NY, PA; U.S.A. (VA, TN, SC, PA, NY, NJ, NC, MD, MA, GA, DE, CT) | Emydidae | Nov 04, 1997 | Reptiles | 5 | Threatened | 5 | US | V | Wherever found, except GA, NC, SC, TN, VA |
| Clemmys muhlenbergii | bog turtle | turtle, bog | C048 | V02 | NC, SC; U.S.A. (GA, NC, SC, TN VA) | Emydidae | Nov 04, 1997 | Reptiles | 5 | Similarity of Appearance to a Threatened Taxon | 4 | US | V | U.S.A. (GA, NC, SC, TN, VA) |
| Cleome multicaulis | Slender spiderflower | Spiderflower, slender | Q0G3 | P01 | AZ, CO, NM, TX, WY; | Capparaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US/Foreign | P | Wherever found |
| Cleomella palmeriana | No common name | No common name | Q0G5 | P01 | CO; | Capparaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Clermontia drepanomorpha | `Oha wai | `Oha wai | Q0G6 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia hawaiiensis hawaiiensis | No common name | No common name | Q1UK | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clermontia konaensis | No common name | No common name | Q27B | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clermontia lindseyana | `Oha wai | `Oha wai | Q1UL | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia loyana | No common name | No common name | Q0G7 | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clermontia multiflora | No common name | No common name | Q316 | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clermontia munroi | No common name | No common name | Q0G8 | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Clermontia oblongifolia ssp. brevipes | `Oha wai | `Oha wai | Q317 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia oblongifolia ssp. mauiensis | `Oha wai | `Oha wai | Q318 | P01 | HI; U.S.A. (HI) | Campanulaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia peleana | `Oha wai | `Oha wai | Q1UM | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia pyrularia | `Oha wai | `Oha wai | Q1UN | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clermontia samuelii | `Oha wai | `Oha wai | Q3H1 | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Clethrionomys gapperi maurus | Kentucky red-backed vole | Vole, Kentucky red-backed | A0EV | V01 | KY; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Clethrionomys gapperi paludicola | Pymatuning red-backed vole | Vole, Pymatuning red-backed | A0F2 | V01 | OH, PA; | Muridae | NA | Mammals | 5 | Not Listed | 3, 5 | US | V | Wherever found |
| Clethrionomys gapperi rupicola | Kittatiny red-backed vole | Vole, Kittatiny red-backed | A0EW | V01 | PA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Clinopodium ashei | No common name | No common name | Q0A4 | P01 | FL, GA; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| clinopodium chandleri | San Miguel savory | savory, San Miguel | Q3JS | P01 | lamiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Clinopodium chandleri | San Miguel savory | Savory, San Miguel | Q0A5 | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Clinopodium dentatum | No common name | No common name | Q0A6 | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Clitoria fragrans | Pigeon wings | Pigeon wings | Q27C | P01 | FL; U.S.A. (FL) | Fabaceae | Apr 27, 1993 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Clonophis kirtlandii | Kirtland's snake | Snake, Kirtland's | C041 | V01 | IL, IN, KY, MI, OH, PA; | Colubridae | NA | Reptiles | 4 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Clusia flava | No common name | No common name | Q27D | P01 | Hypericaceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Cnemidophorus burti | Canyon spotted whiptail | Whiptail, canyon spotted | C05N | V01 | AZ, NM; | Teiidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Cnemidophorus dixoni | Gray-checkered whiptail | Whiptail, gray-checkered | C04B | V01 | NM, TX; | Teiidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Cnemidophorus hyperythrus | Orange-throated whiptail | Whiptail, orange-throated | C04C | V01 | CA; | Teiidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| cnemidophorus hyperythrus ssp. beldingi | Belding's orange-throated whiptail | whiptail, Belding's orange-throated | C06X | V01 | teiidae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Cnemidophorus tesselatus | Colorado checkered whiptail | Whiptail, Colorado checkered | C07F | V01 | CO; | Teiidae | NA | Reptiles | 6 | Not Listed | 6 | US | V | Wherever found |
| Cnemidophorus tigris multiscutatus | Coastal western whiptail | Whiptail, coastal western | C05O | V01 | CA; | Teiidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Cnemidophorus vanzoi | Maria Island ground lizard | Lizard, Maria Island ground | C055 | V01 | St Lucia (Maria Islands); West Indies-St Lucia (Maria Islands) | Teiidae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Coccoloba rugosa | No common name | No common name | Q319 | P01 | PR, VI; | Polygonaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cocculus orbiculatus | No common name | No common name | Q0GA | P01 | HI; | Menispermaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cocculus orbiculatus | No common name | No common name | Q0GB | P01 | HI; | Menispermaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cocculus orbiculatus | No common name | No common name | Q0G9 | P01 | HI; | Menispermaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Coccyzus americanus | Yellow-billed Cuckoo | Cuckoo, yellow-billed | B06R | V01 | AZ, CA, CO, ID, MT, NM, NV, OR, TX, UT, WA, WY; Canada,Mexico,Central and South America | Cuculidae | Nov 03, 2014 | Birds | 8 | Threatened | 1, 2, 6, 8 | US/Foreign | V | Western DPS: U.S.A. (AZ, CA, CO (western), ID, MT (western), NM (western), NV, OR, TX (western), UT, WA, WY (western)); Canada (British Columbia (southwestern); Mexico (Baja California, Baja California Sur, Chihuahua, Durango (western), Sinaloa, Sonora) |
| Coccyzus americanus ssp. occidentalis | No Common Name | No common name | B0FV | V01 | CA; | Coccyzidae | NA | Birds | 8 | Not Listed | 8 | US | V | Wherever found |
| Coccyzus erythropthalmus | Black-billed Cuckoo | Cuckoo, Black-billed | B0HI | V01 | Cuculidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Coelorachis tuberculosa | No common name | No common name | Q0GC | P01 | AL, FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Coelus globosus | Globose dune beetle | Beetle, globose dune | I01H | I01 | CA; | Tenebrionidae | NA | Insects | 1 | Not Listed | 8 | US/Foreign | I | Wherever found |
| Coelus gracilis | San Joaquin dune beetle | Beetle, San Joaquin dune | I01K | I01 | CA; | Tenebrionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Coelus pacificus | Channel Islands dune beetle | Beetle, Channel Islands dune | I0MQ | I01 | CA; | Tenebrionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Coenonycha clementina | San Clemente Island coenonycha beetle | Coenonycha beetle, San Clemente Island | I017 | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Coenonympha tullia yontockett | Yontocket saytr | Saytr, Yontocket | I0MF | I01 | CA; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Colaptes chrysoides | Gilded Flicker | Flicker, Gilded | B0EG | V01 | picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Coleonyx reticulatus | Reticulated gecko | Gecko, reticulated | C03D | V01 | TX; | Gekkonidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Coleonyx switaki | Barefoot gecko | Gecko, barefoot | C03C | V01 | CA; | Eublepharidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Coleonyx variegatus abbotti | San Diego banded gecko | Gecko, San Diego banded | C05A | V01 | CA; | Gekkonidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Coleophora leucochrysella | Chestnut casebearer moth | Casebearer moth, chestnut | I04L | I01 | CT, PA; | Coleophoridae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Coleotichus blackburniae | Koa shield bug | Shield bug, Koa | I0QO | I01 | HI; | Scutellaridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Colinus virginianus ridgwayi | Masked bobwhite (quail) | Bobwhite, masked (quail) | B00Z | V01 | AZ; U.S.A. (AZ), Mexico (Sonora) | Phasianidae | Mar 11, 1967 | Birds | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Collinsia antonina | No common name | No common name | Q0GD | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| collinsia multicolor | San Francisco collinsia | collinsia, San Francisco | Q3KC | P01 | scrophulariaceae | NA | Flowering Plants | 8 | Not Listed | NA | US | P | Wherever found | |
| Collomia debilis var. larsenii | Talus collomia | Collomia, talus | Q2SN | P01 | CA, OR, WA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Collomia macrocalyx | Bristle-flowered collomia | Collomia, bristle-flowered | Q0GE | P01 | OR; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Collomia mazama | Crater Lake collomia | Collomia, Crater Lake | Q0GF | P01 | OR; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Collomia rawsoniana | Rawson's flaming trumpet | Trumpet, Rawson's flaming | Q2O7 | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Collomia renacta | No common name | No common name | Q3CD | P01 | NV, OR; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Colobus satanas | Black colobus monkey | Monkey, black colobus | A06R | V01 | Equatorial Guinea,People's Republic of Congo,Cameroon,Gabon | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Colubrina californica | Las Animas colubrina | Colubrina, Las Animas | Q0GG | P01 | AZ, CA; | Rhamnaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Colubrina oppositifolia | Kauila | Kauila | Q1UO | P01 | HI; U.S.A. (HI) | Rhamnaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Colubrina stricta | Comal snakewood | Snakewood, Comal | Q0GH | P01 | TX; | Rhamnaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Columba inornata wetmorei | Puerto Rican plain Pigeon | Pigeon, Puerto Rican plain | B049 | V01 | PR; ; U.S.A. (PR) | Columbidae | Oct 13, 1970 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Columba junoniae | White-tailed laurel Pigeon | Pigeon, white-tailed laurel | B0A1 | V01 | Spain (Canary Islands) | Columbidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Columba mayeri | Pink pigeon | Pigeon, pink | B0A0 | V01 | Indian Ocean-Mauritius | Columbidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Columba palumbus azorica | Azores wood pigeon | Pigeon, Azores wood | B02Y | V01 | Portugal (Azores) | Columbidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Columbiadoria hallii | No common name | No common name | Q0XF | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Comarostaphylis diversifolia diversifolia | Summer-holly | Summer-holly | Q31A | P01 | CA; Mexico (Baja California) | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Commelina gigas | Climbing dayflower | Dayflower, climbing | Q0GI | P01 | FL; | Commelinaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Condalia hookeri edwardsiana | Edwards' brasil | Brasil, Edwards' | Q0GJ | P01 | TX; | Rhamnaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Condylura cristata parva | Star-nosed mole | Mole, star-nosed | A0BI | V01 | GA, MD, NC, SC, TN, VA, WV; | Talpidae | NA | Mammals | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Conepatus leuconotus texensis | Gulf Coast hog-nosed skunk | Skunk, Gulf Coast hog-nosed | A0FV | V01 | TX; | Mustelidae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Conepatus mesoleucus figginsi | Colorado hog-nosed skunk | Skunk, Colorado hog-nosed | A0EF | V01 | CO; | Mustelidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Conepatus mesoleucus telmalestes | Big Thicket hog-nosed skunk | Skunk, Big Thicket hog-nosed | A0ED | V01 | TX; | Mustelidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Conioselinum mexicanum | Hemlock, Mexican parsley | Parsley, hemlock, Mexican | Q3CE | P01 | AZ; Mexico (Sonora,Chihuahua) | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Conocephaloides remotus | Remote conehead katydid | Katydid, remote conehead | I07S | I01 | HI; Believed to be extinct | Tettigoniidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Conolophus pallidus | Barrington land iguana | Iguana, Barrington land | C00D | V01 | Ecuador (Galapagos Islands) | Iguanidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Conostegia rufescens | No common name | No common name | Q31B | P01 | PR, VI; | Melastomataceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Conozoa hyalina | Central Valley grasshopper | Grasshopper, Central Valley | I0T4 | I01 | Acrididae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Conradina brevifolia | Short-leaved rosemary | Rosemary, short-leaved | Q1UP | P01 | FL; U.S.A. (FL) | Lamiaceae | Jul 12, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Conradina etonia | Etonia rosemary | Rosemary, Etonia | Q3AG | P01 | FL; Known to occur in sand pine scrub found at Etonia Creek State Forest and Dunns Creek State Park in Putnam County, Florida.; U.S.A. (FL) | Lamiaceae | Jul 12, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Conradina glabra | Apalachicola rosemary | Rosemary, Apalachicola | Q1UQ | P01 | FL; U.S.A. (FL) | Lamiaceae | Jul 12, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Conradina grandiflora | [Unnamed] rosemary | Rosemary, [unnamed] | Q0GK | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Conradina verticillata | Cumberland rosemary | Rosemary, Cumberland | Q1UR | P01 | KY, TN; U.S.A. (TN, KY) | Lamiaceae | Nov 29, 1991 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Conraua goliath | Goliath Frog | Frog, Goliath | D02C | V01 | Gabon, Equatorial Guinea, Cameroon | Ranidae | Dec 08, 1994 | Amphibians | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Consolea corallicola | Florida semaphore Cactus | Cactus, Florida semaphore | Q3HT | P01 | FL; | Cactaceae | Nov 25, 2013 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Contopus cooperi | Olive-sided flycatcher | Flycatcher, olive-sided | B0AN | V01 | NC; | Tyrannidae | NA | Birds | 7 | Not Listed | 4 | US/Foreign | V | Wherever found |
| convolvulus equitans | Clay bindweed | bindweed, Clay | Q3JM | P01 | convolvulaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Convolvulus equitans | Small-flowered morning-glory | Morning-glory, small-flowered | Q3L8 | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Copablepharon fuscum | Sand-verbena moth | Moth, sand-verbena | I0VR | I01 | WA; U.S.A. (WA), Canada | Noctuidae | NA | Insects | 1 | Under Review in the Candidate or Petition Process | 1 | US/Foreign | I | Wherever found |
| Cophura hurdi | Antioch cophuran robberfly | Robberfly, Antioch cophuran | I01V | I01 | CA; Possibly extinct,not reported since 1965 | Asilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Copris gopheri | Copris tortoise commensal scarab | Scarab, copris tortoise commensal | I0CY | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Coprosma faurei lanaiensis | No common name | No common name | Q0GL | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Coprosma montana orbicularis | No common name | No common name | Q0GM | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Coprosma ochracea kaalae | No common name | No common name | Q0GN | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Coprosma pubens | No common name | No common name | Q0GO | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Coprosma pubens sessiliflora | No common name | No common name | Q27E | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Copsychus niger cebuensis | Cebu black shama (thrush) | Shama, Cebu black (thrush) | B039 | V01 | Philippines | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Copsychus sechellarum | Seychelles magpie-robin (thrush) | Magpie-robin, Seychelles (thrush) | B021 | V01 | Indian Ocean-Seychelles Islands | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Coquus newtoni | Reunion cuckoo-shrike | Cuckoo-shrike, Reunion | B018 | V01 | Indian Ocean-Reunion | Campephagidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Coquus typicus | Mauritius cuckoo-shrike | Cuckoo-shrike, Mauritius | B017 | V01 | Indian Ocean-Mauritius | Campephagidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Coracopsis nigra barklyi | Seychelles lesser vasa parrot | Parrot, Seychelles lesser vasa | B09X | V01 | Indian Ocean-Seychelles (Praslin Island); Seychelles (Praslin Island) | Psittacidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cordia bellonis | No common name | No common name | Q27F | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Boraginaceae | Jan 10, 1997 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Cordia wagnerorum | No common name | No common name | Q0GQ | P01 | PR, VI; | Boraginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cordulegaster sayi | Say's spiketail | Spiketail, Say's | I0E6 | I01 | FL, GA; | Cordulegastridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Cordylanthus eremicus bernardinus | San Bernardino birds-beak | Birds-beak, San Bernardino | Q0GY | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus eremicus eremicus | Desert birds-beak | Birds-beak, desert | Q0GZ | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus maritimus palustris | Northcoast birds-beak | Birds-beak, northcoast | Q0GR | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cordylanthus maritimus ssp. maritimus | Salt marsh bird's-beak | Bird's-beak, salt marsh | Q1US | P01 | CA; Mexico-Baja California; U.S.A. (CA), Mexico Baja California | Scrophulariaceae | Oct 29, 1978 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Cordylanthus mollis hispidus | Hispid birds-beak | Birds-beak, hispid | Q0GS | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus mollis ssp. mollis | Soft bird's-beak | Bird's-beak, soft | Q0GT | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Nov 20, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cordylanthus nidularius | Mt. Diablo bird's-beak | Bird's-beak, Mt. Diablo | Q0GU | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus orcuttianus | Orcutt's bird's-beak | Bird's-beak, Orcutt's | Q31C | P01 | CA; Mexico (Baja California) | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Cordylanthus palmatus | Palmate-bracted bird's beak | Bird's beak, palmate-bracted | Q1UT | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Jul 01, 1986 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Cordylanthus rigidus littoralis | Seaside birds-beak | Birds-beak, seaside | Q0GV | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus tecopensis | Tecopa bird's-beak | Bird's-beak, Tecopa | Q0GW | P01 | CA, NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus tenuis barbatus | Fresno County bird's-beak | Bird's-beak, Fresno County | Q31D | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus tenuis pallescens | Pallid birds-beak | Birds-beak, pallid | Q0GX | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cordylanthus tenuis ssp. capillaris | Pennell's bird's-beak | Bird's-beak, Pennell's | Q2O8 | P01 | CA; U.S.A. (CA) | Scrophulariaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Coregonus alpenae | Longjaw cisco | Cisco, longjaw | E037 | V01 | IL, IN, MI, NY, OH, PA, WI; Believed to be extinct | Salmonidae | Mar 11, 1967 | Fishes | 3 | Extinction | 3, 5 | US/Foreign | V | Wherever found |
| Coregonus johannae | Deepwater cisco | Cisco, deepwater | E036 | V01 | IL, IN, MI, MN, WI; Believed to be extinct | Salmonidae | NA | Fishes | 3 | Not Listed | 3 | US/Foreign | V | Wherever found |
| Coregonus kiyi | Kiyi | Kiyi | E05V | V01 | IL, IN, MI, MN, NY, WI; | Salmonidae | NA | Fishes | 3 | Not Listed | 3, 5 | US/Foreign | V | Wherever found |
| Coregonus nigripinnis nigripinnis | Blackfin cisco | Cisco, blackfin | E035 | V01 | IL, IN, MI, WI; Believed to be extinct | Salmonidae | NA | Fishes | 3 | Not Listed | 3 | US/Foreign | V | Wherever found |
| Coregonus reighardi | Shortnose cisco | Cisco, shortnose | E039 | V01 | IL, IN, MI, NY, WI; | Salmonidae | NA | Fishes | 3 | Not Listed | 3, 5 | US/Foreign | V | Wherever found |
| Coregonus zenithicus | Shortjaw cisco | Cisco, shortjaw | E038 | V01 | IL, IN, MI, MN, WI; | Salmonidae | NA | Fishes | 3 | Not Listed | 3 | US/Foreign | V | Wherever found |
| Coreobagrus ichikawai | Nekogigi (catfish) | Nekogigi (catfish) | E00O | V01 | Japan | Bagridae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Coreopsis grandiflora | No common name | No common name | Q27G | P01 | AR; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Coreopsis hamiltonii | Mt. Hamilton coreopsis | Coreopsis, Mt. Hamilton | Q0H0 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Coreopsis integrifolia | Ciliate-leaf tickseed | tickseed, Ciliate-leaf | Q3P7 | P01 | FL, GA, SC; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Coreopsis intermedia | Golden wave tickseed | Tickseed, golden wave | Q0H1 | P01 | LA, TX; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Coreopsis latifolia | No common name | No common name | Q0H2 | P01 | GA, NC, SC, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Coreopsis pulchra | No common name | No common name | Q0H3 | P01 | AL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Coreopsis tripteris subrhomboidea | No common name | No common name | Q27H | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Corethrogyne filaginifolia linifolia | Del Mar sand aster | Sand aster, Del Mar | Q3AC | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Corispermum navicula | Boat-shaped Bugseed | Bugseed Boat-shaped | Q3LU | P01 | Chenopodiaceae | NA | Flowering Plants | 6 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Cornutia obovata | Palo de nigua | Palo de nigua | Q27I | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Verbenaceae | Apr 07, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Corvomeyenia carolinensis | Carolina sponge | Sponge, Carolina | O000 | I01 | SC; | Spongillidae | NA | Sponges | 4 | Not Listed | 4 | US | I | Wherever found |
| Corvus hawaiiensis | Hawaiian (='alala) Crow | Crow, Hawaiian (='alala) | B004 | V01 | HI; U.S.A. (HI) | Corvidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Corvus kubaryi | Mariana (=aga) Crow | Crow, Mariana (=aga) | B05X | V01 | GU, MP; Western Pacific Ocean USA (Guam, Rota) | Corvidae | Aug 27, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Corvus leucognaphalus | White-necked crow | Crow, white-necked | B08A | V01 | ; U.S.A. (PR, Dominican Republic, Haiti | Corvidae | Apr 03, 1991 | Birds | 4 | Endangered | NA | US | V | Wherever found |
| Corydalis aquae-gelidae | No common name | No common name | Q0H4 | P01 | OR, WA; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Corydalis caseana brachycarpa | No common name | No common name | Q0H5 | P01 | UT; | Fumariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Corydalis caseana caseana | Sierra corydalis | Corydalis, Sierra | Q27J | P01 | CA; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Corydalis caseana hastata | No common name | No common name | Q0H6 | P01 | ID; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Corynorhinus (=Plecotus) townsendii ingens | Ozark big-eared bat | Bat, Ozark big-eared | A075 | V01 | AR, MO, OK; Entire | Vespertilionidae | Nov 30, 1979 | Mammals | 2 | Endangered | 2, 3, 4 | US | V | Wherever found |
| Corynorhinus (=Plecotus) townsendii virginianus | Virginia big-eared bat | Bat, Virginia big-eared | A080 | V01 | KY, NC, TN, VA, WV; Entire | Vespertilionidae | Dec 31, 1979 | Mammals | 5 | Endangered | 4, 5 | US | V | Wherever found |
| Coryphantha chaffeyi | Chaffey's cory cactus | Cory cactus, Chaffey's | Q31E | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Coryphantha dasyacantha dasyacantha | No common name | No common name | Q2SO | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Coryphantha dasyacantha varicolor | No common name | No common name | Q0H9 | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Coryphantha duncanii | Duncan's cory cactus | Cory cactus, Duncan's | Q0H8 | P01 | NM, TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Coryphantha minima | Nellie cory cactus | Cactus, Nellie cory | Q1UU | P01 | TX; U.S.A. (TX) | Cactaceae | Dec 08, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Coryphantha ramillosa | Bunched cory cactus | Cory cactus, bunched | Q1UV | P01 | TX; Mexico-Coahuila; U.S.A. (TX), Mexico (Coahuila) | Cactaceae | Dec 06, 1979 | Flowering Plants | 2 | Threatened | 2 | US/Foreign | P | Wherever found |
| Coryphantha recurvata | Santa Cruz beehive cactus | Cactus, Santa Cruz beehive | Q0HB | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Coryphantha robbinsiorum | Cochise pincushion cactus | Cactus, Cochise pincushion | Q27L | P01 | AZ; Mexico-Sonora; U.S.A. (AZ), Mexico (Sonora) | Cactaceae | Jan 09, 1986 | Flowering Plants | 2 | Threatened | 2 | US/Foreign | P | Wherever found |
| Coryphantha scheeri uncinata | [Unnamed] cory cactus | Cory cactus, [unnamed] | Q0HD | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Coryphantha scheeri var. robustispina | Pima pineapple cactus | Cactus, Pima pineapple | Q27M | P01 | AZ; Mexico (Sonora); U.S.A. (AZ), Mexico (Sonora) | Cactaceae | Sep 23, 1993 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Coryphantha sneedii var. leei | Lee pincushion cactus | Cactus, Lee pincushion | Q1UW | P01 | NM; U.S.A. (NM) | Cactaceae | Nov 26, 1979 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Coryphantha sneedii var. sneedii | Sneed pincushion cactus | Cactus, Sneed pincushion | Q1UX | P01 | NM, TX; U.S.A. (TX, NM) | Cactaceae | Dec 07, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Coryphantha sulcata nickelsiae | Nickel's cory cactus | Cory cactus, Nickel's | Q0HC | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Coryphantha vivipara alversonii | Alverson's foxtail cactus | Foxtail cactus, Alverson's | Q0HE | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cotinga maculata | Banded cotinga | Cotinga, banded | B04R | V01 | Brazil | Cotingidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cottus asperrimus | Rough sculpin | Sculpin, rough | E04A | V01 | CA; | Cottidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Cottus bairdii | Malheur mottled sculpin | Sculpin, Malheur mottled | E049 | V01 | OR; | Cottidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Cottus extensus | Bear Lake Sculpin | Sculpin Bear Lake | E0B5 | V01 | Cottidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| Cottus greenei | Shoshone sculpin | Sculpin, shoshone | E024 | V01 | ID; | Cottidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Cottus leiopomus | Wood River sculpin | Sculpin, Wood River | E05W | V01 | ID; | Cottidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Cottus marginatus | Margined sculpin | Sculpin, margined | E09F | V01 | WA; | Cottidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Cottus paulus (=pygmaeus) | Pygmy Sculpin | Sculpin, pygmy | E01L | V01 | AL; U.S.A. (AL) | Cottidae | Sep 28, 1989 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Cottus sp. | Bluestone sculpin | Sculpin, bluestone | E06P | V01 | MO; | Cottidae | NA | Fishes | 5 | Not Listed | 3 | US | V | Wherever found |
| Cottus specus | Grotto Sculpin | Sculpin, Grotto | E0AC | V01 | MO; | Cottidae | Oct 25, 2013 | Fishes | 3 | Endangered | 3 | US | V | Wherever found |
| Cottus tenuis | Slender sculpin | Sculpin, slender | E06Q | V01 | OR; | Cottidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Coturnicops noveboracensis | Yellow Rail | Rail, Yellow | B0JG | V01 | Rallidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Coursetia axillaris | No common name | No common name | Q0HG | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Coursetia glabella | No common name | No common name | Q3CF | P01 | TX; Mexico (Chihuahua) | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Crambus daeckeellus | Daecke's pyralid moth | Pyralid moth, Daecke's | I0LL | I01 | DE, NJ; | Pyralidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Crangonyx anomalus | Anomalous spring amphipod | Amphipod, anomalous spring | K00B | I01 | IN, KY, OH; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Crangonyx antennatus | Appalachian Valley cave amphipod | Amphipod, Appalachian Valley cave | K00C | I01 | AL, IL, TN, VA; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Crangonyx dearolfi | Dearolf's cave amphipod | Amphipod, Dearolf's cave | K002 | I01 | MD, PA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Crangonyx grandimanus | Florida cave amphipod | Amphipod, Florida cave | K01N | I01 | FL; | Crangonyctidae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Crangonyx hobbsi | Hobb's cave amphipod | Amphipod, Hobb's cave | K00T | I01 | FL; | Crangonyctidae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Crangonyx minor | Minor cave amphipod | Amphipod, Minor cave | K010 | I01 | IA, IL, IN, MI; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US/Foreign | I | Wherever found |
| Crangonyx packardi | Packard's cave amphipod | Amphipod, Packard's cave | K018 | I01 | IN, KY; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Crangonyx sp | Undescribed amphipod | Amphipod, undescribed | K04U | I01 | Crangonyctidae | NA | Crustaceans | NA | Not Listed | NA | I | Wherever found | ||
| Cranichis ricartii | No common name | No common name | Q3A8 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Orchidaceae | Nov 29, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Craseonycteris thonglongyai | Bumblebee bat | Bat, bumblebee | A09X | V01 | Thailand | Craseonycteridae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crataegus berberifolia | Barberry-leaved hawthorn | Hawthorn, barberry-leaved | Q27O | P01 | LA, TX; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Crataegus harbisonii | [Unnamed] haw | Haw, [unnamed] | Q1UY | P01 | AL, GA, TN; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Crataegus oreophila | Balsam Mountain Hawthorn | Hawthorn, Balsam Mountain | Q3SL | P01 | NC; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Crataegus stenosepala | No common name | No common name | Q27P | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Crataegus sutherlandensis | No common name | No common name | Q27Q | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Crataegus triflora | No common name | No common name | Q3CG | P01 | AL, GA, LA, MS; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Crataegus warneri | Warner hawthorn | Hawthorn, Warner | Q2SP | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Crax alberti | Blue-billed curassow | Curassow, blue-billed | B0BX | V01 | Colombia | Cracidae | Nov 29, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crax blumenbachii | Red-billed curassow | Curassow, red-billed | B040 | V01 | Brazil | Cracidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crenichthys baileyi albivallis | Preston White River springfish | Springfish, Preston White River | E04S | V01 | NV; | Cyprinodontidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Crenichthys baileyi baileyi | White River springfish | Springfish, White River | E04U | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Sep 27, 1985 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Crenichthys baileyi grandis | Hiko White River springfish | Springfish, Hiko White River | E04Q | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Sep 27, 1985 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Crenichthys baileyi moapae | Moapa White River springfish | Springfish, Moapa White River | E04R | V01 | NV; | Cyprinodontidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Crenichthys baileyi thermophilus | Moorman White River springfish | Springfish, Moorman White River | E07T | V01 | NV; | Cyprinodontidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Crenichthys nevadae | Railroad Valley springfish | Springfish, Railroad Valley | E04T | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Mar 31, 1986 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Crescentia portoricensis | Higuero de sierra | Higuero de sierra | Q27R | P01 | PR; U.S.A. (PR) | Bignoniaceae | Dec 04, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Crocodylus acutus | American crocodile | Crocodile, American | C02J | V01 | FL; Mexico,West Indies,Central & South America; U.S.A. (FL) | Crocodylidae | Oct 28, 1975 | Reptiles | 4 | Threatened | 4 | US/Foreign | V | U.S.A. (FL) |
| Crocodylus acutus | American crocodile | Crocodile, American | C02J | V02 | U.S.A. (FL), Mexico, Caribbean, Central and South America | Crocodylidae | Mar 20, 2007 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found, except in U.S.A. (FL) |
| Crocodylus cataphractus | African slender-snouted crocodile | Crocodile, African slender-snouted | C00Q | V01 | Western and Central Africa | Crocodylidae | Mar 28, 1972 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus intermedius | Orinoco crocodile | Crocodile, Orinoco | C008 | V01 | South America-Orinoco River Basin | Crocodylidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus moreletii | Morelet's crocodile | Crocodile, Morelet's | C006 | V01 | Crocodylidae | Jun 02, 1970 | Reptiles | Foreign | Recovery | NA | Foreign | V | Wherever found | |
| Crocodylus niloticus | Nile crocodile | Crocodile, Nile | C007 | V01 | Middle East, Africa | Crocodylidae | Jun 02, 1970 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Crocodylus novaeguineae mindorensis | Philippine crocodile | Crocodile, Philippine | C014 | V01 | Philippine Islands | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus palustris kimbula | Ceylon mugger crocodile | Crocodile, Ceylon mugger | C011 | V01 | Sri Lanka | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus palustris palustris | Mugger crocodile | Crocodile, mugger | C013 | V01 | Pakistan, Iran, India, Bangladesh | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus porosus | Saltwater crocodile | Crocodile, saltwater | C02K | V01 | PW; Southeast Asia, Austrailia, Papua New Guinea, Islands of the West Pacific Ocean | Crocodylidae | Dec 18, 1979 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found, except Papua New Guinea and Australia |
| Crocodylus porosus | Saltwater crocodile | Crocodile, saltwater | C02K | V02 | Australia | Crocodylidae | Jun 24, 1996 | Reptiles | Foreign | Threatened | NA | Foreign | V | Australia |
| Crocodylus rhombifer | Cuban crocodile | Crocodile, Cuban | C005 | V01 | Cuba | Crocodylidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crocodylus siamensis | Siamese crocodile | Crocodile, Siamese | C015 | V01 | Southeast Asia, Malay Peninsula | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Croomia pauciflora | [Unnamed] croomia | Croomia, [unnamed] | Q0HH | P01 | FL; | Stemonaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Crossidius mojavensis mojavensis | Mojave rabbitbrush longhorn beetle | Beetle, Mojave rabbitbrush longhorn | I01I | I01 | CA; | Cerambycidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Crossoptilon crossoptilon | White eared pheasant | Pheasant, white eared | B042 | V01 | China (Tibet),India | Phasianidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crossoptilon mantchuricum | Brown eared pheasant | Pheasant, brown eared | B02P | V01 | China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Crossosoma bigelovii | No common name | No common name | Q0HI | P01 | AZ; | Crossosomataceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Crossosoma californicum | Catalina crossosoma | Crossosoma, Catalina | Q27S | P01 | CA; Mexico (Baja California) | Crossosomataceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Crotalaria avonensis | Avon Park harebells | Harebells, Avon Park | Q31F | P01 | FL; U.S.A. (FL) | Fabaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Crotalus adamanteus | Eastern diamondback rattlesnake | Rattlesnake, eastern diamondback | C077 | V01 | AL, FL, GA, MS, NC, SC; | Viperidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Crotalus cerastes | sidewinder | sidewinder | C06J | V01 | viperidae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Crotalus horridus | Timber rattlesnake | Rattlesnake, timber | C06C | V01 | OH; | Viperidae | NA | Reptiles | NA | Not Listed | 3 | V | Wherever found | |
| Crotalus mitchellii | Speckled rattlesnake | rattlesnake, Speckled | C06K | V01 | viperidae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Crotalus ruber ruber | Northern red diamond rattlesnake | Rattlesnake, northern red diamond | C05C | V01 | CA; | Viperidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| crotalus scutulatus ssp. scutulatus | Mojave green rattlesnake | rattlesnake, Mojave green | C06L | V01 | viperidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Crotalus unicolor | Aruba Island rattlesnake | Rattlesnake, Aruba Island | C035 | V01 | Aruba Island (Netherland Antilles) | Crotalidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Crotalus willardi obscurus | New Mexican ridge-nosed rattlesnake | Rattlesnake, New Mexican ridge-nosed | C01S | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Crotalidae | Aug 21, 1978 | Reptiles | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Crotalus willardi willardi | Arizona ridge-nosed rattlesnake | Rattlesnake, Arizona ridge-nosed | C03R | V01 | AZ; | Viperidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Crotaphytus reticulatus | Reticulate collared lizard | Lizard, reticulate collared | C03N | V01 | TX; | Iguanidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Croton alabamensis alabamensis | Alabama croton | Croton, Alabama | Q0HJ | P01 | AL, TN; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton elliottii | Elliott’s croton | croton, Elliott's | Q0HK | P01 | AL, FL, GA, SC; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton fishlockii | No common name | No common name | Q3CH | P01 | PR, VI; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton glandulosus simpsonii | No common name | No common name | Q0HL | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton impressus | No common name | No common name | Q0HM | P01 | PR, VI; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton microcarpus | No common name | No common name | Q27T | P01 | PR, VI; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Croton wigginsii | Wiggin's croton | Croton, Wiggin's | Q0HN | P01 | AZ, CA; Mexico (Baja California,Sonora) | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Crotophaga ani | Smooth-billed ani | Ani, smooth-billed | B0DS | V01 | Cuculidae | NA | Birds | 4 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Cryptantha aperta | Grand Junction catseye | Catseye, Grand Junction | Q0HO | P01 | CO; Possibly extinct | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha atwoodii | Atwood's catseye | Catseye, Atwood's | Q0HP | P01 | AZ; | Boraginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cryptantha barnebyi | Barneby catseye | Catseye, Barneby | Q0HQ | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha breviflora | [Unnamed] catseye | Catseye, [unnamed] | Q1UZ | P01 | ID, UT; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Cryptantha cinerea arenicola | No common name | No common name | Q31G | P01 | AZ, UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Cryptantha compacta | Compact catseye | Catseye, compact | Q0HR | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha crassipes | Terlingua Creek cat's-eye | Cat's-eye, Terlingua Creek | Q27U | P01 | TX; U.S.A. (TX) | Boraginaceae | Sep 30, 1991 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Cryptantha creutzfeldtii | No common name | No common name | Q2SQ | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha crinita | Silky cryptantha | Cryptantha, silky | Q0HS | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha crymophila | Alpine County cryptantha | Cryptantha, Alpine County | Q27V | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha elata | Cliffdweller's candlestick catseye | Catseye, cliffdweller's candlestick | Q0HT | P01 | CO, UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha ganderi | Gander's cryptantha | Cryptantha, Gander's | Q0HU | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Cryptantha grahamii | Graham catseye | Catseye, Graham | Q0HV | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha hoffmannii | Hoffmann's cryptantha | Cryptantha, Hoffmann's | Q27W | P01 | CA, NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha insolita | [Unnamed] catseye | Catseye, [unnamed] | Q0HX | P01 | NV; Possibly extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha interrupta | No common name | No common name | Q0HY | P01 | ID, MT, NV, OR, WA; Canada (B.C.) | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Cryptantha johnstonii | Johnston catseye | Catseye, Johnston | Q0HZ | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha jonesiana | Jones catseye | Catseye, Jones | Q0I0 | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha mensana | No common name | No common name | Q0I1 | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha ochroleuca | Yellow-white catseye | Catseye, yellow-white | Q0I2 | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha paradoxa | No common name | No common name | Q0I3 | P01 | CO, NM, UT; | Boraginaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Cryptantha rollinsii | No common name | No common name | Q3CI | P01 | CO, UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha roosiorum | Bristlecone catseye | Catseye, bristlecone | Q0I4 | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha semiglabra | Smooth catseye | catseye, Smooth | Q0I5 | P01 | AZ, UT; | Boraginaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2, 6 | US | P | Wherever found |
| Cryptantha shackletteana | [Unnamed] catseye | Catseye, [unnamed] | Q0I6 | P01 | AK; | Boraginaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Cryptantha sobolifera | No common name | No common name | Q0HW | P01 | CA, ID, OR; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cryptantha sobolifera | [Unnamed] catseye | Catseye, [unnamed] | Q27X | P01 | MT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha sobolifera | Schoolcraft's cryptantha | Cryptantha, Schoolcraft's | Q31H | P01 | NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha stricta | [Unnamed] catseye | Catseye, [unnamed] | Q27Y | P01 | CO, UT, WY; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha subcapitata | No common name | No common name | Q2O9 | P01 | WY; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha thompsonii | No common name | No common name | Q0I7 | P01 | OR, WA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cryptantha traskiae | Trask's cryptantha | Cryptantha, Trask's | Q2OA | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha tumulosa | New York Mountains cryptantha | Cryptantha, New York Mountains | Q27Z | P01 | CA, NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptantha weberi | Weber's catseye | Catseye, Weber's | Q0I8 | P01 | CO; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cryptantha welshii | Welsh's cryptantha | Cryptantha, Welsh's | Q31I | P01 | NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cryptobranchus alleganiensis | Hellbender | Hellbender | D00Y | V01 | AL, AR, GA, IA, IL, IN, KS, KY, MD, MN, MO, MS, NC, NY, OH, PA, SC, TN, VA, WV; | Cryptobranchidae | NA | Amphibians | 3 | Under Review in the Candidate or Petition Process | 3, 4, 5, 6 | US | V | Wherever found |
| Cryptobranchus alleganiensis alleganiensis | Eastern Hellbender Missouri DPS | Hellbender, Eastern | D043 | V01 | AL, AR, GA, IL, KY, MD, MS, NC, NY, OH, PA, TN, VA, WV; ; Range-wide | Cryptobranchidae | NA | Amphibians | 3 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Cryptobranchus alleganiensis alleganiensis | Eastern Hellbender Missouri DPS | Hellbender, Eastern | D043 | V02 | MO; Niangua River, Gasconade River, and Meramec River watersheds in Missouri | Cryptobranchidae | NA | Amphibians | 3 | Proposed Endangered | 3 | US | V | Missouri DPS |
| Cryptobranchus alleganiensis bishopi | Ozark Hellbender | Hellbender, Ozark | D032 | V01 | AR, MO; U.S.A. (MO, AR) | Cryptobranchidae | Nov 07, 2011 | Amphibians | 3 | Endangered | 3, 4 | US | V | Wherever found |
| Cryptocarya mannii | No common name | No common name | Q0I9 | P01 | HI; | Lauraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cryptochia denningi | Denning's cryptic caddisfly | Caddisfly, Denning's cryptic | I0IW | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cryptochia excella | Kings Canyon cryptochian caddisfly | Caddisfly, Kings Canyon cryptochian | I03W | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cryptochia neosa | Blue Mountains cryptochian caddisfly | Caddisfly, Blue Mountains cryptochian | I03D | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Cryptochia shasta | Confusion caddisfly | Caddisfly, confusion | I0IV | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Cryptomastix devia | Puget oregonian | oregonian, Puget | G0CF | I01 | OR, WA; | polgyridae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US/Foreign | I | Wherever found |
| Cryptomastix hendersoni | Columbia Oregonian | Oregonian, Columbia | G0EC | I01 | OR, WA; | Polygyridae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US | I | Wherever found |
| Cryptomastix magnidentata | Mission Creek oregonian | Oregonian, Mission Creek | G02H | I01 | ID; | Polygyridae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Cryptomastix sanburni | Kingston Oregonian | Oregonian Kingston | G0DT | I01 | Polygyridae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Crystallaria asprella | Crystal darter | Darter, crystal | E0BP | V01 | FL; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Crystallaria cincotta | diamond Darter | Darter, diamond | E014 | V01 | WV; Entire | Percidae | Aug 26, 2013 | Fishes | 5 | Endangered | 5 | US | V | Wherever found |
| Ctenitis squamigera | Pauoa | Pauoa | S01I | P01 | HI; U.S.A. (HI) | Aspleniaceae | Sep 26, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Ctenium floridanum | No common name | No common name | Q0IA | P01 | FL, GA; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ctenonotus cooki | Cook's anole | Anole, Cook's | C04X | V01 | PR, VI; | Iguanidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Cucurbita okeechobeensis ssp. okeechobeensis | Okeechobee gourd | Gourd, Okeechobee | Q280 | P01 | FL; U.S.A. (FL) | Cucurbitaceae | Jul 12, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Cucurbita texana | No common name | No common name | Q0IB | P01 | TX; | Cucurbitaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cumberlandia monodonta | Spectaclecase (mussel) | Spectaclecase (mussel) | F00X | I01 | AL, AR, IA, IL, KS, KY, MN, MO, TN, VA, WI, WV; U.S.A. (WI, WV, VA, TN, OH, MO, MN, KY, KS, IA, IN, IL, AR, AL) | Margaritiferidae | Apr 12, 2012 | Clams | 3 | Endangered | 3, 4, 5, 6 | US | I | Wherever found |
| Cuon alpinus | Dhole | Dhole | A00Z | V01 | U.S.S.R,North Korea,South Korea,China,India,Southeast Asia | Canidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cuphea aspera | No common name | No common name | Q0IC | P01 | FL; | Lythraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cupressus abramsiana | Santa Cruz cypress | Cypress, Santa Cruz | R005 | P01 | CA; U.S.A. (CA) | Cupressaceae | Jan 08, 1987 | Conifers and Cycads | 8 | Threatened | 8 | US | P | Wherever found |
| Cupressus forbesii | Tecate cypress | Cypress, Tecate | R00C | P01 | CA; Mexico (Baja California) | Cupressaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Cupressus goveniana pigmaea | Mendocino cypress | Cypress, Mendocino | R00D | P01 | CA; | Cupressaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Cupressus goveniana ssp. goveniana | Gowen cypress | Cypress, Gowen | R00A | P01 | CA; U.S.A. (CA) | Cupressaceae | Aug 12, 1998 | Conifers and Cycads | 8 | Threatened | 8 | US | P | Wherever found |
| Cupressus macrocarpa | Monterey cypress | Cypress, Monterey | R000 | P01 | CA; | Cupressaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Cuscuta attenuata | Slender dodder | Dodder, slender | Q0ID | P01 | KS, OK, TX; | Cuscutaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Cuscuta harperi | Harper's dodder | Dodder, Harper's | Q0IE | P01 | AL, GA; | Cuscutaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cuscuta howelliana | Bogg's Lake dodder | Dodder, Bogg's Lake | Q0IF | P01 | CA; | Cuscutaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cuscuta plattensis | Wyoming Dodder | Dodder Wyoming | Q3LV | P01 | Cuscutaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Cuscuta warneri | Warner's dodder | Dodder, Warner's | Q0IG | P01 | AZ, UT; Possibly extinct | Cuscutaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Cusickiella quadricostata | Bodie Hills draba | Draba, Bodie Hills | Q0IH | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cyanea acuminata | Haha | Haha | Q3GJ | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea angustifolia lanaiensis | No common name | No common name | Q0II | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea angustifolia racemosa | No common name | No common name | Q282 | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea arborea | No common name | No common name | Q0IJ | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea asarifolia | Haha | Haha | Q31J | P01 | HI; U.S.A. (HI) | Campanulaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea asplenifolia | Haha | Haha | Q1V0 | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea aspleniifolia | No common name | No common name | Q0IK | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea calycina | Haha | Haha | Q1LP | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea comata | No common name | No common name | Q283 | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea copelandii ssp. copelandii | Haha | Haha | Q31K | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea copelandii ssp. haleakalaensis | Haha | Haha | Q3GV | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea crispa | haha | haha | Q1V1 | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea dolichopoda | Haha | Haha | Q3MS | P01 | HI; U.S.A. (HI) | Campanulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea dunbariae | haha | haha | Q31L | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea duvalliorum | haha | haha | Q3NS | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea eleeleensis | Haha | Haha | Q3HA | P01 | HI; U.S.A. (HI) | Campanulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea gibsonii | haha | haha | Q2SU | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea giffardii | No common name | No common name | Q0IM | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea glabra | Haha | Haha | Q31M | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea grimesiana ssp. cylindrocalyx | No common name | No common name | Q31N | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea grimesiana ssp. grimesiana | Haha | Haha | Q1V2 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea grimesiana ssp. obatae | Haha | Haha | Q2SR | P01 | HI; U.S.A. (HI) | Campanulaceae | Jun 27, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea hamatiflora ssp. carlsonii | Haha | Haha | Q2SS | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea hamatiflora ssp. hamatiflora | Haha | Haha | Q3GW | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea hirtella | No common name | No common name | Q0IL | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea horrida | haha nui | nui, haha | Q3NT | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea humboldtiana | Haha | Haha | Q0IN | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea kauaulaensis | No common name | No common name | Q3OI | P01 | HI; Currently, there are two occurrences of Cyanea kauaulaensis, one each in Kauaula Valley and Waikapu Valley on leeward western Maui (Oppenheimer and Lorence 2012, pp. 15-23). | Campanulaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea kolekoleensis | Haha | Haha | Q3MT | P01 | HI; U.S.A. (HI) | Campanulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea koolauensis | Haha | Haha | Q3GP | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea kuhihewa | Haha | Haha | Q3H2 | P01 | HI; U.S.A. (HI) | Campanulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea kunthiana | Haha | Haha | Q0IO | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea lanceolata | Haha | Haha | Q0IP | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea leptostegia | Giant koke`e | Koke`e, giant | Q0IQ | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea linearifolia | No common name | No common name | Q0IR | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea lobata | Haha | Haha | Q2ST | P01 | HI; U.S.A. (HI) | Campanulaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea longiflora | Haha | Haha | Q3GQ | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea longissima | Haha | Haha | Q31O | P01 | HI; Possibly extinct,last observed in 1927. | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea magnicalyx | haha | haha | Q3NU | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea mannii | Haha | Haha | Q31P | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea maritae | haha | haha | Q3NV | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea marksii | Haha | Haha | Q0IS | P01 | HI; | Campanulaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea mauiensis | haha | haha | Q3NW | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea mceldowneyi | Haha | Haha | Q1V3 | P01 | HI; U.S.A. (HI) | Campanulaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea munroi | haha | haha | Q3NX | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea obtusa | Haha | Haha | Q31Q | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea parvifolia | No common name | No common name | Q1LQ | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea pinnatifida | Haha | Haha | Q284 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea platyphylla | `aku`aku | `aku`aku | Q285 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea pohaku | No common name | No common name | Q31R | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea procera | Haha | Haha | Q31S | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea profuga | Haha | Haha | Q31T | P01 | HI; Believed to be extinct | Campanlaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea pseudofauriei | Haha | Haha | Q3HK | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea purpurellifolia | Haha | Haha | Q1LR | P01 | HI; Believed to be extinct; U.S.A. (HI) | Campanulaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea pycnocarpa | No common name | No common name | Q0IT | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea quercifolia | No common name | No common name | Q31U | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea recta | Haha | Haha | Q31V | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Cyanea remyi | Haha | Haha | Q3GK | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea rivularis | Haha | Haha | Q0LV | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea scabra | No common name | No common name | Q0IU | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea sessilifolia | No common name | No common name | Q1LS | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea shipmanii | Haha | Haha | Q1V4 | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea solanacea | Popolo | Popolo | Q0IV | P01 | HI; | Campanulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea solenocalyx | Molokai cyanea | Cyanea, Molokai | Q0IW | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyanea st.-johnii | Haha | Haha | Q1V5 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea stictophylla | Haha | Haha | Q286 | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea superba | Haha | Haha | Q1V6 | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 11, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea tritomantha | `aku | `aku | Q0IX | P01 | HI; | Campanulaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea truncata | Haha | Haha | Q31W | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanea undulata | Haha | Haha | Q31X | P01 | HI; U.S.A. (HI) | Campanulaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyanopsitta spixii | Little blue macaw | Macaw, little blue | B058 | V01 | Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyanoramphus auriceps forbesi | Forbes' parakeet | Parakeet, Forbes' | B02A | V01 | New Zealand | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyanoramphus cookii (=novaezelandiae c.) | Norfolk Island parakeet | Parakeet, Norfolk Island | B06G | V01 | Australia (Norfolk Island) | Psittacidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyanoramphus malherbi | Orange-fronted parakeet | Parakeet, orange-fronted | B0CU | V01 | Psittacidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Cyathea dryopteroides | Elfin tree fern | Fern, Elfin tree | S01J | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Cyatheaceae | Jun 16, 1987 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Cyathea lunulata | Tree-fern (Tsatsa) | Tree-fern (Tsatsa) | S02D | P01 | Cyatheaceae | NA | Ferns and Allies | NA | Not Listed | NA | P | Wherever found | ||
| Cycas micronesica | Fadang | Fadang | R00P | P01 | GU, MP; | Cycadaceae | Nov 02, 2015 | Conifers and Cycads | 1 | Threatened | 1 | US | P | Wherever found |
| Cycladenia humilis var. jonesii | Jones Cycladenia | Cycladenia, Jones | Q1V7 | P01 | AZ, UT; U.S.A. (UT, AZ) | Apocynaceae | May 05, 1986 | Flowering Plants | 6 | Threatened | 2, 6 | US | P | Wherever found |
| Cyclargus (=Hemiargus) thomasi bethunebakeri | Miami Blue Butterfly | Butterfly, Miami Blue | I02Q | I01 | FL; U.S.A. (FL), Bahamas | Lycaenidae | Apr 06, 2012 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Cyclargus ammon | Nickerbean Blue Butterfly | Butterfly, nickerbean blue | I0W6 | I01 | U.S.A. (FL), Bahamas, Cuba | Lycaenidae | Apr 06, 2012 | Insects | 4 | Similarity of Appearance to a Threatened Taxon | NA | US | I | Wherever found |
| Cycleptus elongatus | Blue sucker | Sucker, blue | E060 | V01 | NM; | Catostomidae | NA | Fishes | 3 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Cyclocephala miamiensis | Miami roundhead scarab | Scarab, Miami roundhead | I0CZ | I01 | FL; Possibly extinct,not reported since 1965 | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Cyclocephala wandae | Beetle | Beetle | I0TR | I01 | Scarabaeidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Cyclocosmia torreya | Torreya trap-door spider | Spider, Torreya trap-door | J006 | I01 | FL; | Ctenizidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Cyclonaias houstonensis | Smooth pimpleback | Pimpleback, smooth | F04G | I01 | TX; | Unionidae | NA | Clams | 2 | Candidate | 2 | US | I | Wherever found |
| Cycloptilum irregularis | Keys scaly cricket | Cricket, Keys scaly | I05L | I01 | FL; | Gryllidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Cyclosorus boydiae | Kupukupu makalii | Kupukupu makalii | S02E | P01 | HI; ; Historic range on the islands of Hawaii, Oahu, and Maui, HI. Current range on the islands of Oahu and Maui, HI | Thelypteridaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Cyclosorus boydiae kipahuluensis | No common name | No common name | S02C | P01 | Thelypteridaceae | NA | Ferns and Allies | 1 | Not Listed | NA | US | P | Wherever found | |
| Cyclosorus boydiae var. boydiae | No common name | No common name | S026 | P01 | HI; | Thelypteridaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyclura carinata bartschi | Mayaguana iguana | Iguana, Mayaguana | C030 | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura carinata carinata | Turks and Caicos iguana | Iguana, Turks and Caicos | C031 | V01 | West Indies-Turks and Caicos Islands | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura collei | Jamaican iguana | Iguana, Jamaican | C02Z | V01 | West Indies-Jamaica | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyclura cornuta nigerrima | Navassa Island iguana | Iguana, Navassa Island | C03E | V01 | Believed to be extinct | Iguanidae | NA | Reptiles | 4 | Not Listed | NA | US | V | Wherever found |
| Cyclura cychlura cychlura | Andros Island ground iguana | Iguana, Andros Island ground | C02U | V01 | West Indies-Bahamas (Andros Island) | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura cychlura figginsi | Exuma Island iguana | Iguana, Exuma Island | C02X | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura cychlura inornata | Allen's Cay iguana | Iguana, Allen's Cay | C02T | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura lewisi | Grand Cayman ground iguana | iguana, Grand Cayman ground | C02Y | V01 | West Indies-Cayman Islands | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyclura nubila caymanensis | Cayman Brac ground iguana | Iguana, Cayman Brac ground | C02V | V01 | West Indies-Cayman Islands | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura nubila nubila | Cuban ground iguana | Iguana, Cuban ground | C02W | V01 | ; Cuba | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Cuba (excludes U.S. Puerto Rico population) |
| Cyclura pinguis | Anegada ground iguana | Iguana, Anegada ground | C00C | V01 | British Virgin Islands (Anegada Islands) | Iguanidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyclura rileyi cristata | White Cay ground iguana | Iguana, White Cay ground | C033 | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura rileyi nuchalis | Acklins ground iguana | Iguana, Acklins ground | C02S | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyclura rileyi rileyi | Watling Island ground iguana | Iguana, Watling Island ground | C032 | V01 | West Indies-Bahamas | Iguanidae | Jun 22, 1983 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyclura stejnegeri | Mona ground Iguana | Iguana, Mona ground | C01R | V01 | PR; Endemic to Mona Island; U.S.A. (PR-Mona Island) | Iguanidae | Mar 06, 1978 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Cygnus buccinator | Trumpeter swan | Swan, trumpeter | B08W | V01 | Anatidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Cygnus buccinator | Trumpeter swan | Swan, trumpeter | B08W | V02 | Anatidae | NA | Birds | 6 | Not Listed | NA | US | V | Greater Yellowstone (Tri-state) breeding pop (DPS) | |
| Cygnus buccinator | Trumpeter swan | Swan, trumpeter | B08W | V03 | Anatidae | NA | Birds | 6 | Not Listed | NA | US | V | Rocky Mountain Population | |
| Cylindrocolea andersonii | [Unnamed] liverwort | Liverwort, [Unnamed] | Q31Y | P01 | NC; Possibly extinct | Cephaloziellaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cylindropsis sp. | Tooth Cave blind rove beetle | Beetle, Tooth Cave blind rove | I0IC | I01 | TX; Believed to be extinct | Staphylinidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cylloepus parkeri | Parker's riffle beetle | Riffle beetle, Parker's | I0C6 | I01 | AZ; | Elmidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cymbiodyta arizonica | Chiricahua water scavenger beetle | Water scavenger beetle, Chiricahua | I0FD | I01 | AZ; | Hydrophilidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Cymocythere clavata | Oconee crayfish ostracod | Ostracod, Oconee crayfish | K04F | I01 | NC, SC; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Cymophyllus fraserianus | No common name | No common name | Q0IY | P01 | GA, KY, MD, NC, PA, SC, TN, VA, WV; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Cymopterus acaulis higginsii | Higgins biscuitroot | Biscuitroot, Higgins | Q0IZ | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus basalticus | No common name | No common name | Q287 | P01 | NV, UT; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Cymopterus beckii | Pinnate spring-parsley | spring-parsley, Pinnate | Q2OB | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus corrugatus | No common name | No common name | Q1LL | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cymopterus corrugatus | No common name | No common name | Q0J0 | P01 | ID, NV, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cymopterus coulteri | Coulter biscuitroot | Biscuitroot, Coulter | Q0J1 | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus davisii | No common name | No common name | Q31Z | P01 | ID; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cymopterus deserticola | Desert cymopterus | Cymopterus, desert | Q0J2 | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cymopterus douglassii | No common name | No common name | Q2OC | P01 | ID; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cymopterus duchesnensis | Duchesne biscuitroot | Biscuitroot, Duchesne | Q0J3 | P01 | CO, UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus everetii | No common name | No common name | Q2SV | P01 | WY; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus goodrichii | No common name | No common name | Q2SW | P01 | NV; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cymopterus ibapensis | No common name | No common name | Q2OD | P01 | ID; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cymopterus megacephalus | No common name | No common name | Q3CJ | P01 | AZ; | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cymopterus minimus | Cedar Breaks biscuitroot | Biscuitroot, Cedar Breaks | Q0J4 | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cymopterus newberryi | No common name | No common name | Q288 | P01 | AZ, UT; | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Cymopterus nivalis | No common name | No common name | Q0J5 | P01 | NV; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cymopterus ripleyi saniculoides | No common name | No common name | Q2SX | P01 | NV; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Cymopterus rosei | No common name | No common name | Q0J6 | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Cynanchum monense | No common name | No common name | Q0J7 | P01 | PR, VI; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cynanchum wigginsii | No common name | No common name | Q320 | P01 | AZ; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Cynomys gunnisoni | Gunnison's prairie dog | Prairie dog, Gunnison's | A0IB | V01 | CO; | Sciuridae | NA | Mammals | 6 | Not Listed | 6 | US | V | central and south-central Colorado, north-central New Mexico |
| Cynomys leucurus | White-tailed prairie dog | White-tailed prairie dog | A0I6 | V01 | Sciuridae | NA | Mammals | 6 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Cynomys ludovicianus | Black-tailed prairie dog | Prairie dog, black-tailed | A0HI | V01 | CO; | Sciuridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Cynomys ludovicianus arizonensis | Arizona black-tailed prairie dog | Prairie dog, Arizona black-tailed | A0DJ | V01 | AZ, NM, TX; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Cynomys mexicanus | Mexican prairie dog | Prairie dog, Mexican | A022 | V01 | Mexico | Sciuridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Mexico |
| Cynomys parvidens | Utah prairie dog | Prairie dog, Utah | A04A | V01 | UT; U.S.A.(UT); Utah prairie dogs are limited to the central and southwestern quarter of Utah in Iron, Beaver, Garfield, Wayne, Piute, Sevier, and Kane, counties. They occur at 6200 ft (1890 m) to 9180 ft (2800 m) above sea level (McDonald 1993). | Sciuridae | Jun 04, 1973 | Mammals | 6 | Threatened | 6 | US | V | Wherever found |
| Cynoscion macdonaldi | Totoaba (seatrout or weakfish) | Totoaba (seatrout or weakfish) | E01W | V01 | Mexico (Gulf of California) | Sciaenidae | May 21, 1979 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyperus cephalanthus | No common name | No common name | Q3CK | P01 | LA, TX; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Cyperus fauriei | No common name | No common name | Q35R | P01 | HI; U.S.A. (HI) | Cyperaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyperus granitophilus | No common name | No common name | Q0J8 | P01 | AL, GA, NC, SC, VA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Cyperus grayoides | Umbrella sedge | Sedge, umbrella | Q0J9 | P01 | IL, LA, MO, TX; | Cyperaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Cyperus louisianensis | [Unnamed] sedge | Sedge, [unnamed] | Q3CL | P01 | LA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cyperus neokunthianus | No common name | No common name | Q35S | P01 | HI; Currently, there are no known extant individuals of this species (PEPP 2013, p. 32); however, it is possible that extant individuals may still be discovered on West Maui. Waihee Valley (West Maui Watershed Partnership) and Maui County lands have been suggested as possible habitat (PEPP 2014, in litt.). ; Cyperus neokunthianus is historically known from three collections from West Maui, one from Honokohau Falls (West Maui Forest Reserve) at an elevation of approximately 854 meters, and the other two are from Waihee Valley (Global Biodiversity Information Facility 2014-Global Online Herbarium Database). | Cyperaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyperus odoratus | Fragrant flatsedge | flatsedge, Fragrant | Q39Y | P01 | HI; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyperus onerosus | Flat dune sedge | Sedge, flat dune | Q0JA | P01 | TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Cyperus pennatiformis | No common name | No common name | Q2Q0 | P01 | HI; | Cyperaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyperus rockii | No common name | No common name | Q35T | P01 | HI; Possibly extinct,last observed in the early 1900's. | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyperus trachysanthos | Pu`uka`a | Pu`uka`a | Q321 | P01 | HI; U.S.A. (HI) | Cyperaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyperus urbanii | Urban's flatsedge | Flatsedge, Urban's | Q173 | P01 | PR, VI; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Cyprinella caerulea | Blue shiner | Shiner, blue | E05Y | V01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Cyprinidae | Apr 22, 1992 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Cyprinella callisema | Ocmulgee shiner | Shiner, Ocmulgee | E09J | V01 | GA; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Cyprinella callitaenia | Bluestripe shiner | Shiner, bluestripe | E01M | V01 | FL; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Cyprinella formosa | Beautiful shiner | Shiner, beautiful | E04B | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Cyprinidae | Aug 31, 1984 | Fishes | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Cyprinella lepida | Plateau shiner | Shiner, Plateau | E0BN | V01 | TX; | Cyprinidae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Cyprinella lutrensis blairi | Maravillas red shiner | Shiner, Maravillas red | E07O | V01 | TX; Believed to be extinct | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Cyprinella proserpina | Proserpine shiner | Shiner, proserpine | E04H | V01 | TX; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Cyprinella sp. | Nueces River shiner | Shiner, Nueces River | E0B3 | V01 | TX; | cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Cyprinella xaenura | Altamaha shiner | shiner, Altamaha | E06R | V01 | GA; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Cyprinodon | Palomas pupfish | Pupfish, Palomas | E045 | V01 | NM; | Cyprinodontidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Cyprinodon bovinus | Leon Springs pupfish | Pupfish, Leon Springs | E023 | V01 | TX; U.S.A. (TX) | Cyprinodontidae | Aug 15, 1980 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Cyprinodon diabolis | Devils Hole pupfish | Pupfish, Devils Hole | E009 | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Mar 11, 1967 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Cyprinodon elegans | Comanche Springs pupfish | Pupfish, Comanche Springs | E008 | V01 | TX; U.S.A. (TX) | Cyprinodontidae | Mar 11, 1967 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| cyprinodon eremus | quitobaquito pupfish | No common name | E0B4 | V01 | AZ; | cyprinodontidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Cyprinodon eximius | Conchos pupfish | Pupfish, Conchos | E043 | V01 | TX; | Cyprinodontidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Cyprinodon macularius | Desert pupfish | Pupfish, desert | E044 | V01 | AZ, CA; U.S.A. (CA, AZ), Mexico | Cyprinodontidae | Mar 31, 1986 | Fishes | 2 | Endangered | 2, 8 | US/Foreign | V | Wherever found |
| Cyprinodon nevadensis calidae | Tecopa pupfish | Pupfish, Tecopa | E047 | V01 | CA; Extinct | Cyprinodontidae | Oct 13, 1970 | Fishes | 8 | Extinction | 8 | US | V | Wherever found |
| Cyprinodon nevadensis mionectes | Ash Meadows Amargosa pupfish | Pupfish, Ash Meadows Amargosa | E042 | V01 | NV; U.S.A. (NV) | Cyprinodontidae | May 10, 1982 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Cyprinodon nevadensis pectoralis | Warm Springs pupfish | Pupfish, Warm Springs | E00W | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Oct 13, 1970 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Cyprinodon nevadensis shoshone | Shoshone pupfish | Pupfish, Shoshone | E06N | V01 | CA; | Cyprinodontidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Cyprinodon pecosensis | Pecos pupfish | Pupfish, Pecos | E046 | V01 | NM; | Cyprinodontidae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Cyprinodon radiosus | Owens pupfish | Pupfish, Owens | E00A | V01 | CA; U.S.A. (CA) | Cyprinodontidae | Mar 11, 1967 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Cyprinodon spp | Monkey Springs pupfish | Pupfish, Monkey Springs | E0AA | V01 | Cyprinodonidae | NA | Fishes | NA | Not Listed | NA | V | Wherever found | ||
| Cyprinodon tularosa | White Sands pupfish | Pupfish, White Sands | E048 | V01 | NM; | Cyprinodontidae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Cypripedium arietinum | Ram's-head lady's-slipper | Lady's-slipper, ram's-head | Q0JB | P01 | CT, MA, ME, MI, MN, NH, NY, VT, WI; | Orchidaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Cypripedium californicum | California lady's-slipper | Lady's-slipper, California | Q0JC | P01 | CA, OR; | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Cypripedium candidum | Small white lady's-slipper | Lady's-slipper, small white | Q0JD | P01 | AL, DE, IA, IL, IN, KY, MD, MI, MN, MO, ND, NE, NJ, NY, OH, PA, SD, WI; | Orchidaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 5, 6 | US | P | Wherever found |
| Cypripedium fasciculatum | Clustered lady's-slipper | Lady's-slipper, clustered | Q3CM | P01 | WA; | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US/Foreign | P | Wherever found |
| Cypripedium kentuckiense | [Unnamed] lady's-slipper | Lady's-slipper, [unnamed] | Q2OE | P01 | AL, AR, KY, LA, MS, OK, TN, TX; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Cypripedium montanum | Mountain lady's-slipper | Lady's-slipper, mountain | Q289 | P01 | AK, CA, MT, OR, WA, WY; Canada (B.C.) | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 7, 8 | US | P | Wherever found |
| Cyprogenia aberti | Western fanshell | Fanshell, western | F01L | I01 | AR, KS, MO, OK; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 2, 3, 4, 6 | US | I | Wherever found |
| Cyprogenia stegaria | Fanshell | Fanshell | F02H | I01 | AL, IL, IN, KY, OH, TN, VA, WV; U.S.A. (WV, VA, TN, PA, OH, KY, IN, IL, AL) | Unionidae | Jun 21, 1990 | Clams | 4 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Cyprogenia stegaria | Fanshell | Fanshell | F02H | I02 | U.S.A. (WV, VA, TN, PA, OH, KY, IN, IL, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Cypseloides niger | Black Swift | Swift, Black | B0FW | V01 | Apodidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Cyrtandra alata | No common name | No common name | Q0JE | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra alnea | No common name | No common name | Q0JF | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra ambigua | No common name | No common name | Q0JG | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra axilliflora | No common name | No common name | Q0JH | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra basipartita | No common name | No common name | Q0JI | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra begoniifolia | `Ilihia | `Ilihia | Q28A | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra biserrata | Ha`iwale | Ha`iwale | Q0JJ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra bryanii | No common name | No common name | Q0JK | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra carinata | No common name | No common name | Q0JL | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra caudatisepala | No common name | No common name | Q0JM | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra christophersenii | No common name | No common name | Q0JO | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra conradtii | No common name | No common name | Q0JQ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra cordifolia brevipilita | No common name | No common name | Q0JR | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra cordifolia gynoglabra | No common name | No common name | Q0JS | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra crassior | No common name | No common name | Q0JT | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra crenata | Ha`iwale | Ha`iwale | Q28B | P01 | HI; U.S.A. (HI) | Gesneriaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra cupuliformis | No common name | No common name | Q0JU | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra cyaneoides | Mapele | Mapele | Q322 | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra dentata | Ha`iwale | Ha`iwale | Q0JV | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra elliptisepala | No common name | No common name | Q0JX | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra ferricolorata | No common name | No common name | Q0JY | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra ferripilosa | haiwale | haiwale | Q3NY | P01 | HI; | Gesneriaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra ferruginosa | No common name | No common name | Q0JZ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra filipes | Ha`iwale | Ha`iwale | Q2SY | P01 | HI; | Gesneriaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra forbesii | No common name | No common name | Q0K1 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra garnotiana | No common name | No common name | Q0KB | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra georgiana | No common name | No common name | Q0K4 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra giffardii | Ha`iwale | Ha`iwale | Q28C | P01 | HI; U.S.A. (HI) | Gesneriaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra gracilis | Haiwale | Haiwale | Q28D | P01 | HI; Believed to be extinct; U.S.A. (HI) | Gesneriaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra grayana lanaiensis | No common name | No common name | Q0K6 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra grayi | No common name | No common name | Q28L | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra halawensis | Ha`iwale | Ha`iwale | Q0K7 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra hawaiensis | No common name | No common name | Q0K8 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra hematos | Ha`iwale | Ha`iwale | Q323 | P01 | HI; Currently, there are 30 scattered individuals of Cyrtandra hematos spread out between the Olokui plateau, Kawela, and Kahuoahu Valley on eastern Molokai (Plant Extinction Prevention Program (PEPP) 2014, in litt.). | Gesneriaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra hirsutula | No common name | No common name | Q0K9 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra honolulensis | No common name | No common name | Q28F | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra hosakae | No common name | No common name | Q0KA | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra intrapilosa | No common name | No common name | Q0KC | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kaalae | No common name | No common name | Q0KD | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kahanensis | No common name | No common name | Q0KE | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kalichii | No common name | No common name | Q0JP | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kauaiensis | Ulunahele | Ulunahele | Q0KI | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kaulantha | Ha`iwale | Ha`iwale | Q0KJ | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra kealiae | Ha`iwale | Ha`iwale | Q324 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra kohalae | No common name | No common name | Q325 | P01 | HI; Believed to be extinct | Gerneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra laevis | No common name | No common name | Q0KL | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra laxiflora | No common name | No common name | Q28G | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lessoniana angustifolia | No common name | No common name | Q28H | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lessoniana intrapubens | No common name | No common name | Q0KM | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra limahuliensis | Ha`iwale | Ha`iwale | Q326 | P01 | HI; U.S.A. (HI) | Gesneriaceae | Feb 25, 1994 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Cyrtandra longifolia longifolia | No common name | No common name | Q0KN | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra longiloba | No common name | No common name | Q0KO | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lydgatei | Ha`iwale | Ha`iwale | Q327 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lysiosepala grayi | No common name | No common name | Q0KP | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lysiosepala haleakalensis | No common name | No common name | Q0KQ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra lysiosepala lysiosepala | No common name | No common name | Q0KR | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra macrocalyx | Ha`iwale | Ha`iwale | Q328 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra malacophylla malacophylla | No common name | No common name | Q0KS | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra mannii | No common name | No common name | Q0KT | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra menziesii | Ha`iwale | Ha`iwale | Q0KU | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra munroi | Ha`iwale | Ha`iwale | Q28I | P01 | HI; U.S.A. (HI) | Gesneriaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra nanawaleensis | haiwale | No common name | Q3OB | P01 | HI; | Gesneriaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra niuensis | No common name | No common name | Q0KV | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra oenobarba | Ha`iwale | Ha`iwale | Q0KX | P01 | HI; U.S.A. (HI) | Gesneriaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra olona | No common name | No common name | Q329 | P01 | HI; Believed to be extinct | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra oxybapha | Ha`iwale | Ha`iwale | Q32A | P01 | HI; | Gesneriaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra paliku | Haiwale | Haiwale | Q3MU | P01 | HI; U.S.A. (HI) | Gesneriaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra paludosa | No common name | No common name | Q0K5 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra paludosa | No common name | No common name | Q0K3 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra paludosa | No common name | No common name | Q0KW | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra paludosa haupuensis | No common name | No common name | Q0L0 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra pickeringii | Ha`iwale | Ha`iwale | Q0L3 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra platyphylla hiloensis | No common name | No common name | Q0L5 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra polyantha | Ha`iwale | Ha`iwale | Q1V8 | P01 | HI; U.S.A. (HI) | Gesneriaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra pruinosa | Ha`iwale | Ha`iwale | Q0L7 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra pubens | No common name | No common name | Q0L8 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra ramosissima | No common name | No common name | Q0L9 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra rivularis | No common name | No common name | Q0LI | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra rockii | No common name | No common name | Q0LA | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra sandwicensis | Ha`iwale | Ha`iwale | Q0LB | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra scabrella | No common name | No common name | Q28J | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra sessilis | Ha`iwale | Ha`iwale | Q32B | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra subintegra | No common name | No common name | Q28K | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra subumbellata | Ha`iwale | Ha`iwale | Q1V9 | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra tintinnabula | Ha`iwale | Ha`iwale | Q32C | P01 | HI; U.S.A. (HI) | Gesneriaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra turbiniformis | No common name | No common name | Q0LF | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra vaniota | No common name | No common name | Q0LG | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra villicalyx pubentigyna | No common name | No common name | Q0LH | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra viridiflora | Ha`iwale | Ha`iwale | Q32D | P01 | HI; U.S.A. (HI) | Gesneriaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra wagneri | haiwale | No common name | Q3OC | P01 | HI; | Gesneriaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra waiolani | Haiwale | Haiwale | Q0LK | P01 | HI; Believed to be extinct; U.S.A. (HI) | Gesneriaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Cyrtandra X atomigyna | No common name | No common name | Q0K2 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X atomigyna | No common name | No common name | Q0LE | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X basipartita | No common name | No common name | Q0L1 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X crassifolia | No common name | No common name | Q0LD | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X crassifolia | No common name | No common name | Q0LC | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X crassifolia | No common name | No common name | Q0LJ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X ferruginosa | No common name | No common name | Q0KZ | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X forbesii | No common name | No common name | Q0JN | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X forbesii | No common name | No common name | Q0KG | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X forbesii | No common name | No common name | Q0KH | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X hillebrandii | No common name | No common name | Q28E | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X honolulensis | No common name | No common name | Q0L4 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X hosakae | No common name | No common name | Q0KY | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X hosakae | No common name | No common name | Q0KK | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X kipapaensis | No common name | No common name | Q0L2 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X rockii | No common name | No common name | Q0L6 | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X rockii | No common name | No common name | Q0JW | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtandra X rockii | No common name | No common name | Q0KF | P01 | HI; | Gesneriaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Cyrtodactylus serpensinsula | Serpent Island gecko | Gecko, Serpent Island | C02R | V01 | Indian Ocean-Mauritius | Gekkonidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Cyrtonaias tampicoensis tecomatensis | Tampico pearlymussel | Pearlymussel, Tampico | F00Z | I01 | Mexico | Unionidae | Jun 14, 1976 | Clams | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Cyrtonyx montezumae merriami | Merriam's Montezuma quail | Quail, Merriam's Montezuma | B05K | V01 | Mexico (Vera Cruz) | Phasianidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Cyrtopeltis phyllostegiae | Phyllostegian leaf bug | Bug, phyllostegian leaf | I02Z | I01 | HI; Believed to be extinct | Miridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Dactylocythere isabelae | [Unnamed] ostracod | Ostracod, [unnamed] | K03X | I01 | NC; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Dactylocythere peedeensis | Pee Dee crayfish ostracod | ostracod, Pee Dee crayfish | K03Y | I01 | NC; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Dactylocythere prinsi | Whitewater crayfish ostracod | Ostracod, whitewater crayfish | K04G | I01 | NC; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Daihinibaenetes arizonensis | Arizona giant sand treader cricket | Cricket, Arizona giant sand treader | I05F | I01 | AZ; | Rhaphidophoridae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Dalea bartonii | Cox's dalea | Dalea, Cox's | Q0LL | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dalea carthagenensis floridana | Florida prairie-clover | Prairie-clover, Florida | Q3HL | P01 | FL; Miami-Dade, Mainland Monroe, FL, not Florida Keys | Fabaceae | Oct 06, 2017 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Dalea flavescens epica | Hole-In-The-Rock prairie-clover | Prairie-clover, Hole-In-The-Rock | Q2SZ | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Dalea foliosa | Leafy prairie-clover | Prairie-clover, leafy | Q28M | P01 | AL, IL, TN; U.S.A. (TN, IL, AL) | Fabaceae | May 01, 1991 | Flowering Plants | 4 | Endangered | 3, 4 | US | P | Wherever found |
| Dalea gattingeri | No common name | No common name | Q0LM | P01 | AL, GA, TN; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dalea reverchonii | Comanche-peak prairie-clover | Prairie-clover, Comanche-peak | Q0LN | P01 | TX; Texas counties: Bosque, Erath, Hood, Johnson, Parker, Somervell, Tarrant, and Wise. | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dalea sabinalis | Sabinal prairie-clover | Prairie-clover, Sabinal | Q0LO | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dalea scariosa | [Unnamed] prairie-clover | Prairie-clover, [unnamed] | Q0LP | P01 | NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dalea tentaculoides | Gentry's indigobush | Indigobush, Gentry's | Q2T0 | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dama mesopotamica (=dama m.) | Persian fallow deer | Deer, Persian fallow | A00X | V01 | Iraq,Iran | Cervidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Damaliscus pygarus (=dorcas) dorcas | Bontebok | Bontebok | A04T | V01 | South Africa | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Danaus plexippus plexippus | Monarch butterfly | butterfly, monarch | I0WJ | I01 | AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY; | Nymphalidae | NA | Insects | 3 | Under Review in the Candidate or Petition Process | 1, 2, 3, 4, 5, 6, 8 | US/Foreign | I | Wherever found |
| Daphnopsis hellerana | No common name | No common name | Q28N | P01 | PR; U.S.A. (PR) | Thymelaeaceae | Jun 23, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Darlingtonia californica | California pitcherplant | Pitcherplant, California | Q2T1 | P01 | CA, OR; | Sarraceniaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Dasymutilla imperialis | Velvet ant | Ant, velvet | I0TN | I01 | Mutillidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Dasymutilla nocturna | Velvet ant | Ant, velvet | I0TM | I01 | Mutillidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Dasynotus daubenmirei | No common name | No common name | Q0LQ | P01 | ID; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dasyornis broadbenti littoralis | Western rufous bristlebird | Bristlebird, western rufous | B04Q | V01 | Australia | Muscicapidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Dasyornis longirostris (=brachypterus I.) | Western bristlebird | Bristlebird, western | B010 | V01 | Australia | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Dasyurus viverrinus | Eastern native-cat | Native-cat, eastern | A049 | V01 | Australia | Dasyuridae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Daubentonia madagascariensis | Aye-aye | Aye-aye | A00P | V01 | Entire | Daubentoniidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Decodes stevensi | Stevens' tortricid moth | Tortricid moth, Stevens' | I0M8 | I01 | CO; | Tortricidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Dedeckera eurekensis | July gold | Gold, July | Q0LR | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Deeringothamnus pulchellus | Beautiful pawpaw | Pawpaw, beautiful | Q28O | P01 | FL; U.S.A. (FL) | Annonaceae | Sep 26, 1986 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Deeringothamnus rugelii | Rugel's pawpaw | Pawpaw, Rugel's | Q28P | P01 | FL; Known to occur in pine flatwoods at Tiger Bay State Forest, on county conservation lands, and on private lands, all within Volusia County, Florida.; U.S.A. (FL) | Annonaceae | Sep 26, 1986 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Deinandra (=Hemizonia) conjugens | Otay tarplant | Tarplant, Otay | Q0YQ | P01 | CA; U.S.A. (CA), Mexico | Asteraceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US/Foreign | P | Wherever found |
| Deinandra increscens ssp. villosa | Gaviota Tarplant | Tarplant, Gaviota | Q340 | P01 | CA; U.S.A. (CA) | Asteraceae | Mar 20, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Deinocossonus nesiotes | Oahu nesiotes weevil | Weevil, Oahu nesiotes | I0G6 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Deinomimesa hawaiiensis | Hawaiian deinomimesan sphecid wasp | Sphecid wasp, Hawaiian deinomimesan | I0DY | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Deinomimesa punae | Puna deinomimesan sphecid wasp | Sphecid wasp, puna deinomimesan | I0DZ | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Deirochelys reticularia ssp. miaria | Western Chicken turtle | turtle, Western Chicken | C07U | V01 | AR, MO, MS; | Emydidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | 3, 4 | US | V | Wherever found |
| Delissea fallax | No common name | No common name | Q0LS | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delissea laciniata | No common name | No common name | Q0LT | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delissea lauliiana | No common name | No common name | Q32E | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delissea parviflora | No common name | No common name | Q0LU | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delissea rhytidosperma | No common name | No common name | Q1VA | P01 | HI; U.S.A. (HI) | Campanulaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Delissea sinuata | No common name | No common name | Q0LW | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delissea subcordata | Oha | Oha | Q1VB | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Delissea undulata | No common name | No common name | Q0LX | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Delphinapterus leucas | beluga whale | whale, beluga | A0K5 | V01 | AK; ; Cook Inlet DPS | Monodontidae | Apr 13, 2011 | Mammals | NMFS | Endangered | 7 | US/Foreign | V | Cook Inlet DPS See 50 CFR 224.101 |
| Delphinium alabamicum | Alabama larkspur | Larkspur, Alabama | Q0LY | P01 | AL; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Delphinium bakeri | Baker's larkspur | Larkspur, Baker's | Q0LZ | P01 | CA; U.S.A. (CA) | Ranunculaceae | Jan 26, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Delphinium californicum interius | Hospital Canyon larkspur | Larkspur, Hospital Canyon | Q2T2 | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium exaltatum | Tall larkspur | Larkspur, tall | Q32F | P01 | NC; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Delphinium hesperium cuyamacae | Cuyamaca larkspur | Larkspur, Cuyamaca | Q2OF | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium hutchinsonae | Hutchinson's delphinium | Delphinium, Hutchinson's | Q0M0 | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium inopinum | Unexpected larkspur | Larkspur, unexpected | Q28Q | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium leucophaeum | Larkspur | Larkspur | Q0M1 | P01 | OR, WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delphinium luteum | Yellow larkspur | Larkspur, yellow | Q0M2 | P01 | CA; U.S.A. (CA) | Ranunculaceae | Jan 26, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Delphinium multiplex | [Unnamed] larkspur | Larkspur, [unnamed] | Q0M3 | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delphinium newtonianum | [Unnamed] larkspur | Larkspur, [unnamed] | Q0M4 | P01 | AR; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Delphinium nuttallianum lineapetalum | [Unnamed] larkspur | Larkspur, [unnamed] | Q0M5 | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delphinium nuttallii ssp. nuttallii | Willamette Valley larkspur | larkspur, Willamette Valley | Q3N9 | P01 | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Delphinium parryi blochmaniae | Dune larkspur | Larkspur, dune | Q32G | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium parryi ssp. purpureum | Mt. Pinos larkspur | Larkspur, Mt. Pinos | Q28R | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium pavonaceum | Peacock larkspur | Larkspur, peacock | Q0M6 | P01 | OR; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delphinium recurvatum | Recurved larkspur | Larkspur, recurved | Q32H | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium treleasei | [Unnamed] larkspur | Larkspur, [unnamed] | Q28S | P01 | AR, MO; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Delphinium variegatum ssp. kinkiense | San Clemente Island larkspur | Larkspur, San Clemente Island | Q1VC | P01 | CA; U.S.A. (CA) | Ranunculaceae | Sep 12, 1977 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Delphinium variegatum thornei | Thorne's royal larkspur | Larkspur, Thorne's royal | Q0M7 | P01 | CA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Delphinium viridescens | Wenatchee larkspur | Larkspur, Wenatchee | Q0M8 | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Delphinium xantholeucum | Northwestern larkspur | Larkspur, northwestern | Q0M9 | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Deltistes luxatus | Lost River sucker | Sucker, Lost River | E052 | V01 | CA, OR; The current range of the Lost River sucker includes lakes and tributaries in the Upper Klamath Riber basin in Oregon and California. This includes Upper Klamath Lake and its major tributaries, especially the Sprague and Williamson River; Clear lake and its tributaryies, Willow, Boles, and Fletcher creeks; The Lost River and Tule Lake; and the Klamath River downstream to Iron Gate Dam. Although historically Lost River suckers were present in Lower Klamath Lake in large numbers no resident populations are current present there.; U.S.A. (OR, CA) | Catostomidae | Jul 18, 1988 | Fishes | 8 | Endangered | 1, 8 | US | V | Wherever found |
| Dendrobium guamense | No common name | No common name | Q3OV | P01 | GU, MP; | Orchidaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Dendrocopos noguchii | Okinawa woodpecker | woodpecker, Okinawa | B0D1 | V01 | Picidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Dendrocygna arborea | West Indian whistling duck | Duck, West Indian whistling | B068 | V01 | PR, VI; West Indies | Anatidae | NA | Birds | 4 | Not Listed | 4 | US | V | Puerto Rico |
| Dendrocygna bicolor | Fulvous whistling duck | Duck, fulvous whistling | B06T | V01 | AZ, CA; | Anatidae | NA | Birds | 1 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Dendrographa leucophaea | No common name | No common name | Q3CN | P01 | CA; | Roccellaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Dendrogyra cylindrus | Pillar Coral | Coral, Pillar | P002 | I01 | Meandrinidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | US/Foreign | I | Wherever found | |
| Dendroica cerulea | Cerulean warbler | Warbler, cerulean | B09I | V01 | AL, AR, CT, DE, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, OK, PA, RI, TN, TX, VA, VT, WI, WV; | Parulidae | NA | Birds | 3 | Not Listed | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Dendroica chrysoparia | Golden-cheeked warbler (=wood) | Warbler (=wood), golden-cheeked | B07W | V01 | TX; ; U.S.A. (TX), Nicaragua, Mexico, Honduras, Guatemala | Parulidae | May 04, 1990 | Birds | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Dendroica dominica stoddardi | Stoddard's yellow-throated warbler | Warbler, Stoddard's yellow-throated | B07X | V01 | FL; | Emberizidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Dendroica petechia petechia | Barbados yellow warbler (=wood) | Warbler (=wood), Barbados yellow | B03H | V01 | West Indies-Barbados | Emberizidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| dendroica petechia ssp. brewsteri | Yellow warbler | warbler, Yellow | B0EN | V01 | fringillidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Dendroica petechia ssp. sonorana | Sonoran Yellow Warbler | Warbler, Sonoran Yellow | B0F7 | V01 | Parulidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Dendromecon rigida rhamnoides | Island tree poppy | Tree poppy, island | Q2OG | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dendromecon rigida ssp. harfordii | Channel Island tree poppy | Tree poppy, Channel Island | Q3CO | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dendropemon sintenisii | Hicaquillo | Hicaquillo | Q0MA | P01 | PR, VI; | Loranthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dentaria incisa | No common name | No common name | Q0MB | P01 | TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Deparia kaalaana | No common name | No common name | S02L | P01 | HI; Deparia kaalaana is historically known from the islands of Maui, Hawaii, and Kauai (Palmer 2003, pp. 109-111; Plant Extinction Prevention Program (PEPP) 2014, p. 91; PEPP 2014, in litt.). Currently, there is one single known individual of D. kaalaana in Haleakala National Park on East Maui (Palmer 2003, pp. 109-111; PEPP 2014, p. 91; PEPP 2014, in litt.). ; Deparia kaalaana is historically known from the islands of Maui, Hawaii, and Kauai (Palmer 2003, pp. 109−111; Plant Extinction Prevention Program (PEPP) 2014, p. 91; PEPP 2014, in litt.). Currently, there is one single known individual of D. kaalaana in Haleakala National Park on East Maui (Palmer 2003, pp. 109−111; PEPP 2014, p. 91; PEPP 2014, in litt.). | Woodsiaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Dermatemys mawii | Central American river turtle | Turtle, Central American river | C04H | V01 | Mexico, Guatemala, Belize | Dermatemyidae | Jun 22, 1983 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Dermochelys coriacea | Leatherback sea turtle | Sea turtle, leatherback | C00F | V01 | AL, CA, CT, DE, FL, GA, HI, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OR, PR, RI, SC, TX, VA, VI, WA; Palau,tropical temperate,subpolar waters; Worldwide in tropical and temperate waters of the Atlantic, Pacific, and Indian Oceans. | Dermochelyidae | Jun 02, 1970 | Reptiles | 4 | Endangered | 1, 2, 4, 5, 8 | US/Foreign | V | Wherever found |
| Deroceras hesperium | Evening fieldslug | fieldslug, Evening | G0EA | I01 | OR, WA; | Limacidae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US/Foreign | I | Wherever found |
| Deronectes neomexicana | Bonita diving beetle | Diving beetle, Bonita | I0KY | I01 | NM, TX; | Dytiscidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Deropristus deroderus | Haleakala deropristus ground beetle | Ground beetle, Haleakala deropristus | I0PC | I01 | HI; | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Descurainia torulosa | No common name | No common name | Q2T3 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Desmanthus bicornutus | Ruby bundleflower | Bundleflower, ruby | Q28T | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Desmocerus californicus dimorphus | Valley elderberry longhorn beetle | Beetle, valley elderberry longhorn | I01L | I01 | CA; U.S.A. (CA) | Cesambycidae | Aug 08, 1980 | Insects | 8 | Threatened | 8 | US | I | Wherever found |
| Desmodium humifusum | Ground-spreading tick-trefoil | Tick-trefoil, ground-spreading | Q32I | P01 | CT, DE, MA, MD, NJ, NY, PA; | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Desmodium lindheimeri | Lindheimer's tickseed | Tickseed, Lindheimer's | Q0MC | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Desmodium ochroleucum | Creamy tick-trefoil | Tick-trefoil, creamy | Q3IU | P01 | NC; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Desmognathus abditus | Cumberland Dusky salamander | salamander, Cumberland Dusky | D04O | V01 | TN; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Desmognathus aeneus | Seepage salamander | Salamander, seepage | D02W | V01 | NC; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Desmognathus auriculatus | Southern Dusky Salamander | Salamander, southern dusky | D03A | V01 | AL, FL; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Desmognathus brimleyorum | Ouachita dusky salamander | Salamander, Ouachita dusky | D02J | V01 | AR, OK; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 2, 4 | US | V | Wherever found |
| Desmognathus wrighti | Pygmy salamander | salamander, Pygmy | D03U | V01 | Plethodontidae | NA | Amphibians | 4 | Not Listed | NA | US | V | Wherever found | |
| Desmona bethula | Amphibious caddisfly | Caddisfly, amphibious | I0IU | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Desmopachria cenchramis | Fig seed diving beetle | Diving beetle, fig seed | I069 | I01 | FL; Possibly extinct,not reported since 1965 | Dytiscidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Dexteria floridana | Florida fairy shrimp | Shrimp, Florida fairy | K061 | I01 | FL; | Chirocephalidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Diacyclops jeanneli putei | Carolina well diacyclops | Diacyclops, Carolina well | K04D | I01 | NC; | Cyclopidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| diadophis punctatus | Ringneck snake | snake, Ringneck | C06T | V01 | colubridae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Diadophis punctatus acricus | Key ringneck snake | Snake, Key ringneck | C040 | V01 | FL; | Colubridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Diadophis punctatus modestus | San Bernardino ringneck snake | Snake, San Bernardino ringneck | C05H | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Diadophis punctatus similis | San Diego ringneck snake | Snake, San Diego ringneck | C05I | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Diastole matafaoi | Mt. Matafao different snail | Snail, Mt. Matafao different | G03J | I01 | AS; | Helicarionidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Diastole schmeltziana | [Unnamed] snail | Snail, [unnamed] | G099 | I01 | AS; | Helicarionidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Dicamptodon ensatus | California giant salamander | Salamander, California giant | D04D | V01 | CA; | Ambystomatidae | NA | Amphibians | 8 | Not Listed | 8 | US | V | Wherever found |
| dicamptodon tenebrosus | Pacific giant salamander | salamander, Pacific giant | D03G | V01 | dicamptodontidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Dicentra formosa oregana | Pacific bleeding-heart | Bleeding-heart, Pacific | Q1VD | P01 | CA, OR; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Dicentra nevadensis | Sierra Nevada bleeding-heart | Bleeding-heart, Sierra Nevada | Q0MD | P01 | CA; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dicentra ochroleuca | Yellow bleedingheart | Bleedingheart, yellow | Q0ME | P01 | CA; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dicerandra christmanii | Garrett's mint | Mint, Garrett's | Q2RL | P01 | FL; Lake Wales Ridge; U.S.A. (FL) | Lamiaceae | Nov 01, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Dicerandra cornutissima | Longspurred mint | Mint, longspurred | Q2OH | P01 | FL; Known to occur in scrub habitat in Marion County, Florida (includes sites at the Cross Florida Greenway, along I-75, and on private lands in Marion Oaks and Ocala Waterway Estates).; U.S.A. (FL) | Lamiaceae | Nov 01, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Dicerandra frutescens | Scrub mint | Mint, scrub | Q1VE | P01 | FL; U.S.A. (FL) | Lamiaceae | Nov 01, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Dicerandra immaculata | Lakela's mint | Mint, Lakela's | Q1VF | P01 | FL; U.S.A. (FL) | Lamiaceae | May 15, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Dicerandra odoratissima | [Unnamed] mint | Mint, [unnamed] | Q0MF | P01 | FL, GA, SC; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dicerandra radfordiana | [Unnamed] mint | Mint, [unnamed] | Q32J | P01 | GA; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dicerorhinus sumatrensis | Sumatran rhinoceros | Rhinoceros, Sumatran | A026 | V01 | Bangladesh to Vietnam to Indonesia (Borneo); Wherever found | Rhinocerotidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Diceros bicornis | Black rhinoceros | Rhinoceros, black | A081 | V01 | Sub-Saharan Africa | Rhinocerotidae | Jul 14, 1980 | Mammals | Foreign | Endangered | NA | Foreign | V | Sub-Saharan Africa |
| Dichanthelium (=Panicum) hirstii | Hirst Brothers' Panic grass | Panic grass, Hirst Brothers' | Q1BG | P01 | DE, GA, NC, NJ; ; Sussex County, Delaware; Atlantic and Burlington Counties, New Jersey; Onslow County, North Carolina; and Sumter County, Georgia | Poaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Dichanthelium aciculare var. aciculare | No common name | No common name | Q1BL | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dichanthelium acuminatum acuminatum | The Geysers panic grass | Panic grass, The Geysers | Q0MG | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dichanthelium acuminatum var. acuminatum | Shasta panic grass | Panic grass, Shasta | Q1ZU | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dichanthelium acuminatum var. acuminatum | Fernald's panic grass | Panic grass, Fernald's | Q1BI | P01 | VA; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Dichanthelium cynodon | [Unnamed] panic grass | Panic grass, [unnamed] | Q1ZT | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dichanthelium cynodon | Tussock panic grass | Panic grass, Tussock | Q1BE | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dichanthelium cynodon | [Unnamed] panic grass | Panic grass, [unnamed] | Q1ZS | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dichanthelium nudicaule | No common name | No common name | Q1BK | P01 | AL, FL, MS; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dichanthelium scabriusculum | woolly rosette grass | Rosette grass, Woolly | Q1BD | P01 | DC, NY, RI, VA; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Dichelostemma lacuna-vernalis | Vernal pool brodiaea | Brodiaea, vernal pool | Q0MH | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dichondra donnelliana | California dichondra | Dichondra, California | Q0MI | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dichondra occidentalis | Western dichondra | Dichondra, western | Q0MJ | P01 | CA; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dicliptera krugii | No common name | No common name | Q0MK | P01 | PR, VI; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Dicranopselaphus variegatus | Variegated false water penny | False water penny, variegated | I06Z | I01 | IL; | Eubriidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| dicranoweisia crispula | Dicranoweisia moss | moss, Dicranoweisia | U009 | P01 | dicranaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Dieteria bigelovii var. mucronata | Bigelow tansyaster | Tansyaster, Bigelow | Q16O | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dieteria canescens var. leucanthemifolia | Whiteflower tansyaster | Tansyaster, Whiteflower | Q16N | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Digitaria floridana | No common name | No common name | Q2T4 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Digitaria gracillima | No common name | No common name | Q2T5 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Digitaria pauciflora | Florida pineland crabgrass | Crabgrass, Florida pineland | Q1VG | P01 | FL; | Poaceae | Oct 06, 2017 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Dinacoma caseyi | Casey's June Beetle | Beetle, Casey's June | I0TG | I01 | CA; U.S.A. (CA) | Scarabaeidae | Oct 24, 2011 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Diomedia amsterdamensis | Amsterdam Albatross | Albatross, Amsterdam | B09J | V01 | Indian Ocean--Amsterdam Island | Diomedeidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Dionaea muscipula | Venus flytrap | Venus flytrap | Q0MM | P01 | NC, SC; | Droseraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Dionda diaboli | Devils River minnow | Minnow, Devils River | E03V | V01 | TX; U.S.A. (TX), Mexico | Cyprinidae | Oct 20, 1999 | Fishes | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Dionda nigrotaeniata | Guadalupe roundnose Minnow | Minnow, Guadalupe roundnose | E0C5 | V01 | Cyprinidae | NA | Fishes | 2 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Diplacus aridus | Low bush monkeyflower | Bush monkeyflower, low | Q0MN | P01 | CA; Mexico (Baja California) | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Diplacus clevelandii | Cleveland's bush monkeyflower | Monkeyflower, Cleveland's bush | Q3LA | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Diplacus vandenbergensis | Vandenberg monkeyflower | Monkeyflower, Vandenberg | Q3NC | P01 | CA; U.S.A. (CA) | Phrymaceae | Sep 25, 2014 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Diplazium molokaiense | No common name | No common name | S00R | P01 | HI; U.S.A. (HI) | Woosiaceae | Sep 26, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Diplectrona californica | California diplectronan caddisfly | Caddisfly, California diplectronan | I03G | I01 | CA; | Hydropsychidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Diplectrona rossi | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NB | I01 | LA; | Hydropsychidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Dipodomys californicus eximius | Marysville California kangaroo rat | Kangaroo rat, Marysville California | A0GX | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys elator | Texas kangaroo rat | Kangaroo rat, Texas | A08R | V01 | OK, TX; | Heteromyidae | NA | Mammals | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Dipodomys elephantinus | Big-eared kangaroo rat | Kangaroo rat, big-eared | A08N | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys heermanni berkleyensis | Berkeley kangaroo rat | Kangaroo rat, Berkeley | A0GY | V01 | CA; | Heteromyidae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys heermanni dixoni | Merced kangaroo rat | Kangaroo rat, Merced | A0GZ | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys heermanni morroensis | Morro Bay kangaroo rat | Kangaroo rat, Morro Bay | A03X | V01 | CA; U.S.A.(CA) | Heteromyidae | Oct 13, 1970 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Dipodomys ingens | Giant kangaroo rat | Kangaroo rat, giant | A08P | V01 | CA; U.S.A.(CA) | Heteromyidae | Jan 05, 1987 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Dipodomys merriami collinus | Earthquake Merriam's kangaroo rat | Kangaroo rat, Earthquake Merriam's | A0H0 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys merriami frenatus | Virgin Merriam's kangaroo rat | Kangaroo rat, Virgin Merriam's | A08T | V01 | UT; | Heteromyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Dipodomys merriami parvus | San Bernardino Merriam's kangaroo rat | Kangaroo rat, San Bernardino Merriam's | A0G8 | V01 | CA; U.S.A.(CA) | Heteromyidae | Jan 27, 1998 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Dipodomys microps alfredi | Gunnison Island kangaroo rat | Kangaroo rat, Gunnison Island | A0B2 | V01 | UT; | Heteromyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Dipodomys microps leucotis | Marble Canyon kangaroo rat | Kangaroo rat, Marble Canyon | A0B3 | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Dipodomys microps russeolus | Dolphin Island kangaroo rat | Kangaroo rat, Dolphin Island | A0B4 | V01 | UT; | Heteromyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Dipodomys nitratoides brevinasus | Short-nosed kangaroo rat | Kangaroo rat, short-nosed | A0B5 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Dipodomys nitratoides exilis | Fresno kangaroo rat | Kangaroo rat, Fresno | A08O | V01 | CA; U.S.A.(CA) | Heteromyidae | Jan 30, 1985 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Dipodomys nitratoides nitratoides | Tipton kangaroo rat | Kangaroo rat, Tipton | A08S | V01 | CA; U.S.A.(CA) | Heteromyidae | Jul 08, 1988 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Dipodomys ordii cineraceus | Dolphin Island ord's kangaroo rat | Kangaroo rat, Dolphin Island ord's | A0B6 | V01 | UT; | Heteromyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| dipodomys simulans | Dulzura kangaroo rat | kangaroo rat, Dulzura | A0J0 | V01 | heteromyidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Dipodomys stephensi (incl. D. cascus) | Stephens' kangaroo rat | Kangaroo rat, Stephens' | A08Q | V01 | CA; U.S.A.(CA) | Heteromyidae | Sep 30, 1988 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| dipsosaurus dorsalis | Desert iguana | iguana, Desert | C06M | V01 | iguanidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Discoglossus nigriventer | Israel painted frog | Frog, Israel painted | D002 | V01 | Israel | Discoglossidae | Jun 02, 1970 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Disconaias salinasensis | Salina mucket | Mucket, Salina | F02R | I01 | TX; | Unionidae | NA | Clams | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Discus brunsoni | Lake Disc | Disc Lake | G0DU | I01 | Discidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Discus macclintocki | Iowa Pleistocene snail | Snail, Iowa Pleistocene | G00T | I01 | IA, IL, WI; U.S.A. (IL, IA) | Discidae | Aug 02, 1978 | Snails | 3 | Endangered | 3 | US | I | Wherever found |
| Discus marmorensis | Marbled disc | Disc, marbled | G01U | I01 | ID; | Discidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Discus shemeki cockerelli | Cockerell's striate disc | Disc, Cockerell's striate | G05Y | I01 | AZ, CA, CO, MT, NM, OR, SD, UT, WY; | Discidae | NA | Snails | 6 | Not Listed | 1, 2, 6, 8 | US/Foreign | I | Wherever found |
| Disenochus micantipennis | Kauai disenochus ground beetle | Ground beetle, Kauai disenochus | I0PD | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Dissanthelium californicum | California dissanthelium | Dissanthelium, California | Q0MO | P01 | CA; Possibly extinct | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Dissochondrus biflorus | No common name | No common name | Q1VH | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Distocambarus carlsoni | Mimic crayfish | crayfish, Mimic | K06Q | I01 | SC; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Distocambarus devexus | Broad River Burrowing crayfish | crayfish, Broad River Burrowing | K06R | I01 | GA; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Distocambarus youngineri | Saluda crayfish | Crayfish, Saluda | K030 | I01 | SC; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Distoleon perjerus | Molokai antlion | Antlion, Molokai | I026 | I01 | HI; | Myrmeleontidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ditaxis cyanophylla | No common name | No common name | Q0MT | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ditaxis cyanophylla | No common name | No common name | Q0MQ | P01 | NV; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ditaxis serrata | California ditaxis | Ditaxis, California | Q0MP | P01 | CA; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dithyrea maritima | Beach spectacle-pod | Spectacle-pod, beach | Q2OI | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Dobsonia chapmani | Negros Naked-Backed Fruit Bat | Bat, Negros Naked-Backed Fruit | A0JU | V01 | Pteropodidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Dodecahema leptoceras | Slender-horned spineflower | Spineflower, slender-horned | Q2T6 | P01 | CA; U.S.A. (CA) | Polygonaceae | Sep 28, 1987 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Dodecatheon austrofrigidum | Tundra shootingstar | Shootingstar, Tundra | Q3CP | P01 | OR, WA; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodecatheon frenchii | French's shootingstar | Shootingstar, French's | Q0MR | P01 | AR, IL, IN, KY, MO; | Primulaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Dodecatheon poeticum | No common name | No common name | Q0MS | P01 | OR, WA; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa costulata | No common name | No common name | Q0MU | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa forbesii | No common name | No common name | Q0MV | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa lanaiensis | No common name | No common name | Q0MW | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa molokaiensis | No common name | No common name | Q0MX | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa oblonga | No common name | No common name | Q0MY | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa pallida | No common name | No common name | Q0MZ | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa skottsbergii | No common name | No common name | Q0N0 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea eriocarpa varians | No common name | No common name | Q0N1 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea sandwicensis latifolia | No common name | No common name | Q0N2 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea sandwicensis simulans | No common name | No common name | Q0N3 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea stenoptera fauriei | No common name | No common name | Q0N4 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dodonaea stenoptera stenoptera | No common name | No common name | Q0N5 | P01 | HI; | Sapindaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dolania americana | American sandburrowing mayfly | Mayfly, American sandburrowing | I09M | I01 | AL, FL, GA, LA, NC, SC, WI; | Behningiidae | NA | Insects | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Dolophilodes oregonus | Oregon dolophilodes caddisfly | Caddisfly, Oregon dolophilodes | I047 | I01 | OR; | Philoptamidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Donacia idola | Bog idol leaf beetle | Beetle, bog idol leaf | I029 | I01 | WA; | Chrysomelidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Donrichardsia macroneuron | donrichard moss | moss, donrichard | U00K | P01 | Amblystegiaceae | NA | Lichens | 2 | Not Listed | NA | US | P | Wherever found | |
| Doryonychus raptor | Hawaiian spider | Spider, Hawaiian | J01F | I01 | Tetragnathidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Doryopteris angelica | No common name | No common name | S02H | P01 | HI; U.S.A. (HI) | Pteridaceae | May 13, 2010 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Doryopteris takeuchii | No common name | No common name | S028 | P01 | HI; U.S.A. (HI) | Pteridaceae | Oct 18, 2012 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Dosilia palmeri | Oklawaha sponge | Sponge, Oklawaha | O003 | I01 | FL; | Spongillidae | NA | Sponges | 4 | Not Listed | 4 | US/Foreign | I | Wherever found |
| Douglasia idahoensis | No common name | No common name | Q2OJ | P01 | ID; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Douglasia laevigata laevigata | No common name | No common name | Q0N6 | P01 | OR, WA; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Douglasia nivalis nivalis | No common name | No common name | Q28U | P01 | WA; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Downingia concolor brevior | Cuyamac Lake downingia | Downingia, Cuyamac Lake | Q3AD | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Downingia pusilla | Dwarf downingia | Downingia, dwarf | Q28V | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba apiculata daviesiae | No common name | No common name | Q0N7 | P01 | MT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba aprica | No common name | No common name | Q0N8 | P01 | AR, GA, MO, OK, SC; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Draba argyraea | No common name | No common name | Q0N9 | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Draba arida | No common name | No common name | Q0NA | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba asprella asprella | No common name | No common name | Q0NB | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Draba asprella kaibabensis | No common name | No common name | Q0NC | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Draba asprella stelligera | No common name | No common name | Q0ND | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Draba asprella zionensis | Zion whitlow-grass | Whitlow-grass, Zion | Q0NE | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba asterophora asterophora | Tahoe draba | Draba, Tahoe | Q0NG | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba asterophora macrocarpa | Cup Lake draba | Draba, Cup Lake | Q0NF | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba brachystylis | Wasatch Draba | Draba Wasatch | Q3LW | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Draba carnosula | Mt. Eddy draba | Draba, Mt. Eddy | Q0NH | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba crassifolia nevadensis | Dolomite draba | Draba, dolomite | Q0NI | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba cruciata cruciata | Mineral King draba | Draba, Mineral King | Q0NJ | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba cruciata integrifolia | Mt. Whitney draba | Draba, Mt. Whitney | Q0NK | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba douglasii crockeri | Crocker's draba | Draba, Crocker's | Q28W | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba douglasii douglasii | Douglas' draba | Draba, Douglas' | Q28X | P01 | CA, ID, NV, OR, WA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Draba exunguiculata | [Unnamed] whitlow-wort | Whitlow-wort, [unnamed] | Q28Y | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba jaegeri | No common name | No common name | Q0NL | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba kassii | No common name | No common name | Q32K | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba lemmonii cyclomorpha | No common name | No common name | Q0NM | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Draba lemmonii incrassata | Sweetwater Mountains draba | Draba, Sweetwater Mountains | Q0NN | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba maguirei burkei | No common name | No common name | Q0NO | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba maguirei maguirei | No common name | No common name | Q0NP | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba mogollonica | No common name | No common name | Q0NQ | P01 | NM; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Draba murrayi | No common name | No common name | Q2OK | P01 | AK; Canada (Yukon) | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Draba nivalis brevicula | Snow, little draba | Draba, snow, little | Q0NR | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba oreibata serpentina | No common name | No common name | Q3CQ | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba paucifructa | No common name | No common name | Q0NS | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba pectinipila | No common name | No common name | Q0NT | P01 | CO, WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba ramulosa | Tushar Mountain Whitlow grass | grass Tushar Mountain Whitlow | Q3LX | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Draba ruaxes | No common name | No common name | Q28Z | P01 | AK, WA; Canada (B.C.) | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 1, 7 | US | P | Wherever found |
| Draba smithii | No common name | No common name | Q3CR | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba sobolifera | Stolon whitlow-grass | Whitlow-grass, stolon | Q0NU | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba sphaerocarpa | [Unnamed] stolon | Stolon, [unnamed] | Q0NV | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Draba sphaeroides cusickii | No common name | No common name | Q290 | P01 | NV, OR, UT; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Draba standleyi | Standley whitlow-grass | Whitlow-grass, Standley | Q3CS | P01 | AZ, NM, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Draba stenoloba ramosa | Branched draba | Draba, branched | Q0NW | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Draba subalpina | [Unnamed] whitlow-grass | Whitlow-grass, [unnamed] | Q0NX | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Draba trichocarpa | Stanley whitlow-grass | Whitlow-grass, Stanley | Q3CT | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Draba weberi | Weber's Whitlow grass | grass Weber's Whitlow | Q3LY | P01 | Brassicaceae | NA | Flowering Plants | 6 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Draba yukonensis | No common name | No common name | Q32L | P01 | AK; Canada (Yukon) | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Dracontium polyphyllum | No common name | No common name | Q32M | P01 | PR, VI; | Araceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Drepanis coccinea | `I`iwi | `I`iwi | B0GU | V01 | HI; | Fringillidae | Oct 20, 2017 | Birds | 1 | Threatened | 1 | US | V | Wherever found |
| Drepanoptila holosericea | Cloven-feathered dove | Dove, cloven-feathered | B01B | V01 | Southwest Pacific Ocean-New Caledonia | Columbidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Driloleirus americanus | Giant Palouse earthworm | earthworm, Giant Palouse | L001 | I01 | ID, OR, WA; | Megascolecidae | NA | Annelid Worms | 1 | Not Listed | 1 | US | I | Wherever found |
| Dromus dromas | Dromedary pearlymussel | Pearlymussel, dromedary | F00K | I01 | AL, KY, TN, VA; U.S.A. (VA, TN, KY, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Dromus dromas | Dromedary pearlymussel | Pearlymussel, dromedary | F00K | I02 | U.S.A. (VA, TN, KY, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Dromus dromas | Dromedary pearlymussel | Pearlymussel, dromedary | F00K | I03 | U.S.A. (VA, TN, KY, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Drosophila aglaia | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0QW | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila alsophila | Valley mydas fly | Fly, Valley mydas | I0R9 | I01 | HI; | Drosophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Drosophila differens | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0RE | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila digressa | Hawaiian picture-wing fly | Fly, Hawaiian picture-wing | I0QY | I01 | HI; | Drosophilidae | Nov 29, 2013 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila hemipeza | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0RC | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila heteroneura | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0QZ | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila lanaiensis | Lanai pomace fly | Pomace fly, Lanai | I0C1 | I01 | HI; Possibly extinct,not reported since 1965 | Drosophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Drosophila montgomeryi | Hawaiian picture-wing fly | picture-wing fly, Hawaiian | I0R0 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila mulli | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0R1 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Threatened | 1 | US | I | Wherever found |
| Drosophila musaphilia | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0R2 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila neoclavisetae | Hawaiian picture-wing fly | picture-wing fly, Hawaiian | I0R3 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila obatai | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0R4 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila ochrobasis | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0RD | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila psilotarsalis | Valley mydas fly | Fly, Valley mydas | I0RA | I01 | HI; | Drosophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Drosophila sharpi | Hawaiian picture-wing fly | Fly, Hawaiian picture-wing | I0QX | I01 | HI; U.S.A. (HI) | Drosophilidae | May 13, 2010 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila substenoptera | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0R5 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila tarphytrichia | Hawaiian picture-wing fly | fly, Hawaiian picture-wing | I0R6 | I01 | HI; U.S.A. (HI) | Drosophilidae | May 09, 2006 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Drosophila toxochaeta | Valley mydas fly | Fly, Valley mydas | I0RB | I01 | HI; | Drosophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Drymarchon corais couperi | Eastern indigo snake | Snake, eastern indigo | C026 | V01 | AL, FL, GA; U.S.A. (SC, MS, GA, FL, AL) | Colubridae | Mar 03, 1978 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Dryobius sexnotatus | Sixbanded long-horned beetle | Long-horned beetle, sixbanded | I089 | I01 | AL, AR, IN, KS, KY, LA, MD, MI, MO, MS, OH, PA, TN, VA, WV; | Cerambycidae | NA | Insects | 4 | Not Listed | 3, 4, 5, 6 | US | I | Wherever found |
| Dryocopus galeatus | Helmeted woodpecker | Woodpecker, helmeted | B0BN | V01 | Picidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Dryocopus javensis richardsi | Tristam's woodpecker | Woodpecker, Tristam's | B03R | V01 | Korea | Picidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| dryocopus pileatus | Pileated woodpecker | woodpecker, Pileated | B0E0 | V01 | picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Dryopteris crinalis var. podosorus | Palapalai aumakua | aumakua, Palapalai | S02I | P01 | HI; U.S.A. (HI) | Dryopteridaceae | May 13, 2010 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Dryopteris glabra var. pusilla | Hohiu | Hohiu | S029 | P01 | HI; This species is known from the Kawaikoi Stream, Waiakoali Stream, and Alakai Swamp trail, in Kokee State Park, on the island of Kauai (PEPP 2014, in litt.; Smithsonian Institute 2014-Online Herbarium Database). This species is currently known from the Kawaikoi Stream, Waiakoali Headwaters, and Alakai Swamp trail, in Kokee State Park, on the island of Kauai (PEPP 2014, in litt.; Smithsonian Institute 2014-Online Herbarium Database). ; This species is known from the Kawaikoi Stream, Waiakoali Stream, and Alakai Swamp trail, in Kokee State Park, on the island of Kauai (PEPP 2014, in litt.; Smithsonian Institute 2014-Online Herbarium Database). This species is currently known from the Kawaikoi Stream, Waiakoali Headwaters, and Alakai Swamp trail, in Kokee State Park, on the island of Kauai (PEPP 2014, in litt.; Smithsonian Institute 2014-Online Herbarium Database). | Dryopteridaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Dryopteris takeuchii | No common name | No common name | S02F | P01 | Dryopteridaceae | NA | Ferns and Allies | 1 | Not Listed | NA | US | P | Wherever found | |
| Dubautia arborea | Na`ena`e | Na`ena`e | Q2T7 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia herbstobatae | Na`ena`e | Na`ena`e | Q2T8 | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia imbricata ssp. imbricata | Na`ena`e | Na`ena`e | Q32N | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia kalalauensis | Naenae | Naenae | Q3MV | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia kenwoodii | Naenae | Naenae | Q3MW | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia knudsenii degeneri | No common name | No common name | Q291 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia knudsenii filiformis | Na`ena`e | Na`ena`e | Q32O | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia knudsenii knudsenii | Knudsen dubautia | Dubautia, Knudsen | Q1VJ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia laevigata parvifolia | No common name | No common name | Q0NY | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia latifolia | Koholapehu | Koholapehu | Q1VK | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia laxa blakei | No common name | No common name | Q0NZ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia laxa waianensis | Na`ena`e-pua-melemele | Na`ena`e-pua-melemele | Q0O0 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia linearis ssp. hillebrandii | No common name | No common name | Q1VI | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia magnifolia | No common name | No common name | Q0O1 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia menziesii | No common name | No common name | Q1VP | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia menziesii | Na`ena`e | Na`ena`e | Q1VQ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia microcephala | Na`ena`e | Na`ena`e | Q0O2 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia molokaiensis | No common name | No common name | Q1VM | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia montana robustior | No common name | No common name | Q1VN | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia pauciflorula | Na`ena`e | Na`ena`e | Q32P | P01 | HI; U.S.A. (HI) | Asteraceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia plantaginea acridentata | No common name | No common name | Q0O3 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia plantaginea plantaginea | No common name | No common name | Q1VO | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia plantaginea ssp. humilis | Na`ena`e | Na`ena`e | Q32Q | P01 | HI; U.S.A. (HI) | Asteraceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia plantaginea ssp. magnifolia | Na`ena`e | Na`ena`e | Q3H3 | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia platyphylla leptophylla | No common name | No common name | Q0O4 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia reticulata | No common name | No common name | Q0O5 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia sherffiana | Sherff railliardia | Railliardia, Sherff | Q2T9 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia thyrsiflora cernua | No common name | No common name | Q292 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia thyrsiflora thyrsiflora | No common name | No common name | Q1VS | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia waialealae | Na`ena`e | Na`ena`e | Q0O6 | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Dubautia X fallax | No common name | No common name | Q1VL | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubautia X thyrsiflora | No common name | No common name | Q1VR | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Dubiraphia brunnescens | Brownish dubiraphian riffle beetle | Riffle beetle, brownish dubiraphian | I0C7 | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Dubiraphia giulianii | Giuliani's dubiraphian riffle beetle | Riffle beetle, Giuliani's dubiraphian | I0C8 | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Dubiraphia parva | Little riffle beetle | Riffle beetle, little | I0C9 | I01 | LA, OK; | Elmidae | NA | Insects | 4 | Not Listed | 2, 4 | US | I | Wherever found |
| Dubiraphia robusta | Robust dubiraphian riffle beetle | Riffle beetle, robust dubiraphian | I0CA | I01 | WI; | Elmidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Dubiraphia sp. | Dubiraphian riffle beetle | Riffle beetle, dubiraphian | I06R | I01 | ME; | Elmidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Ducula galeata | Marquesas pigeon | Pigeon, Marquesas | B0CT | V01 | French Polynesia | Columbidae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ducula mindorensis | Mindoro imperial (=zone-tailed) pigeon | Pigeon, Mindoro imperial (=zone-tailed) | B05H | V01 | Philippines | Columbidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ducula oceanica ratakensis | Radak Micronesian pigeon | Pigeon, Radak Micronesian | B0DH | V01 | MH; | Columbidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found |
| Ducula oceanica teraoki | Truk Micronesian pigeon | Pigeon, Truk Micronesian | B0DI | V01 | FM; | Columbidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found |
| Dudleya abramsii affinis | San Bernardino Mountains dudleya | Dudleya, San Bernardino Mountains | Q32R | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya abramsii bettinae | San Luis serpentine dudleya | Dudleya, San Luis serpentine | Q0O8 | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya abramsii murina | Mouse-leaved dudleya | Dudleya, mouse-leaved | Q2TA | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya abramsii ssp. parva | Conejo dudleya | Dudleya, Conejo | Q0O7 | P01 | CA; U.S.A. (CA) | Crassulaceae | Jan 29, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya attentuata orcuttii | Orcutt's dudleya | Dudleya, Orcutt's | Q32S | P01 | CA; Mexico (Baja California) | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Dudleya blochmaniae blochmaniae | Short-leaved dudleya | Dudleya, short-leaved | Q3CU | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya blochmaniae brevifolia | Short-leaved dudleya | Dudleya, short-leaved | Q0O9 | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya blochmaniae insularis | Santa Rosa Island dudleya | Dudleya, Santa Rosa Island | Q0OA | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya candelabrum | Candleholder dudleya | Dudleya, candleholder | Q0OB | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya cymosa costifolia | Pierpoint Springs liveforever | Liveforever, Pierpoint Springs | Q32T | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya cymosa crebrifolia | San Gabriel River dudleya | Dudleya, San Gabriel River | Q32U | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya cymosa ssp. marcescens | Marcescent dudleya | Dudleya, marcescent | Q0OC | P01 | CA; U.S.A. (CA) | Crassulaceae | Jan 29, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya cymosa ssp. ovatifolia | Santa Monica Mountains dudleyea | Dudleya, Santa Monica Mountains | Q3AK | P01 | CA; U.S.A. (CA) | Crassulaceae | Jan 29, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya densiflora | San Gabriel Mountains dudleya | Dudleya, San Gabriel Mountains | Q0OD | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya multicaulis | Many-stemmed liveforever | Liveforever, many-stemmed | Q0OE | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya nesiotica | Santa Cruz Island dudleya | Dudleya, Santa Cruz Island | Q0OF | P01 | CA; U.S.A. (CA) | Crassulaceae | Jul 31, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya saxosa collomiae | No common name | No common name | Q0OG | P01 | AZ; | Crassulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dudleya saxosa saxosa | Panamint dudleya | Dudleya, Panamint | Q2OL | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya setchellii | Santa Clara Valley dudleya | Dudleya, Santa Clara Valley | Q32V | P01 | CA; U.S.A. (CA) | Crassulaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Dudleya sp. | Sp. nov. ined. (munchkin) dudleya | Dudleya, sp. nov. ined. (munchkin) | Q3HC | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dudleya stolonifera | Laguna Beach liveforever | Liveforever, Laguna Beach | Q0OH | P01 | CA; U.S.A. (CA) | Crassulaceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya traskiae | Santa Barbara Island liveforever | Liveforever, Santa Barbara Island | Q1VT | P01 | CA; U.S.A. (CA) | Crassulaceae | May 27, 1978 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Dudleya variegata | Variegated dudleya | Dudleya, variegated | Q0OI | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Dudleya verityi | Verity's dudleya | Dudleya, Verity's | Q2OM | P01 | CA; U.S.A. (CA) | Crassulaceae | Jan 29, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Dudleya virens | Green liveforever | Liveforever, green | Q2ON | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| dudleya virens ssp. insularis | Island green dudleya | dudleya, Island green | Q3KF | P01 | crassulaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Dudleya viscida | Sticky-leaved liveforever | Liveforever, sticky-leaved | Q0OJ | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Dugong dugon | Dugong | Dugong | A033 | V02 | PW; At least 37 countries from East Africa to southern Japan; East Africa to southern Japan | Dugongidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Dumontia oregonensis | hairy water flea | water flea, hairy | K05J | I01 | Dumontiidae | NA | Crustaceans | 1 | Not Listed | NA | US | I | Wherever found | |
| Dyschoriste crenulata | No common name | No common name | Q0OK | P01 | TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Dysticheus rotundicollis | Antioch Dune weevil | Weevil, Antioch Dune | I020 | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Eanus hatchi | Hatch's click beetle | Click beetle, Hatch's | I04M | I01 | WA; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ecclisomyia bilera | King's Creek ecclisomyian caddisfly | Caddisfly, King's Creek ecclisomyian | I03X | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Echeandia chandleri | Lilia de los llanos | Lilia de los llanos | Q023 | P01 | TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| echeandia texensis | No common name | No common name | Q3LF | P01 | liliaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Echinacea laevigata | Smooth coneflower | Coneflower, smooth | Q293 | P01 | GA, NC, SC, VA; U.S.A. (VA, SC, PA, NC, MD, GA) | Asteraceae | Oct 08, 1992 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Echinacea tennesseensis | Tennessee purple coneflower | Coneflower, Tennessee purple | Q1VU | P01 | TN; | Asteraceae | Jul 05, 1979 | Flowering Plants | 4 | Recovery | 4 | US | P | Wherever found |
| Echinargus isola | Reakirt's blue butterfly | Butterfly, Reakirt's blue | I0WF | I01 | AR, AZ, CA, CO, IA, KS, LA, MN, MO, MT, NM, NV, OK, SD, TX, UT, WY; | Lycaenidae | NA | Insects | 8 | Not Listed | 2, 3, 4, 6, 8 | US/Foreign | I | Wherever found |
| Echinocactus horizonthalonius var. nicholii | Nichol's Turk's head cactus | Cactus, Nichol's Turk's head | Q1VV | P01 | AZ; U.S.A. (AZ) | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Echinocereus chisoensis var. chisoensis | Chisos Mountain hedgehog Cactus | Cactus, Chisos Mountain hedgehog | Q294 | P01 | TX; U.S.A. (TX) | Cactaceae | Sep 30, 1988 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Echinocereus engelmannii howei | Howe's hedgehog cactus | Hedgehog cactus, Howe's | Q0OM | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Echinocereus engelmannii munzii | Munz's hedgehog cactus | Hedgehog cactus, Munz's | Q0ON | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Echinocereus engelmannii var. purpureus | Purple-spined Hedgehog cactus | Hedgehog cactus, purple-spined | Q0OP | P01 | UT; | Cactaceae | Oct 11, 1979 | Flowering Plants | 6 | Original Data in Error - Taxonomic Revision | 6 | US | P | Entire |
| Echinocereus fendleri var. kuenzleri | Kuenzler hedgehog cactus | Cactus, Kuenzler hedgehog | Q1VW | P01 | NM; U.S.A. (NM) | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Echinocereus ledingii | No common name | No common name | Q0OQ | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus lloydii | Lloyd's hedgehog cactus | Cactus, Lloyd's hedgehog | Q1VX | P01 | NM, TX; | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Original Data in Error - Not a listable entity | 2 | US/Foreign | P | Entire |
| Echinocereus papillosus angusticeps | Small papillosus | Papillosus, small | Q0OO | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus reichenbachii fitchii | Fitch's hedgehog cactus | Hedgehog cactus, Fitch's | Q0OR | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus reichenbachii var. albertii | Black lace cactus | Cactus, black lace | Q1VY | P01 | TX; U.S.A. (TX) | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Echinocereus russanthus | Rusty hedgehog cactus | Hedgehog cactus, rusty | Q0OS | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus triglochidiatus var. arizonicus | Arizona hedgehog cactus | Cactus, Arizona hedgehog | Q1VZ | P01 | AZ; U.S.A. (AZ) | Cactaceae | Nov 26, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Echinocereus triglochidiatus var. inermis | Spineless hedgehog Cactus | Cactus, spineless hedgehog | Q1W1 | P01 | CO, UT; | Cactaceae | Dec 07, 1979 | Flowering Plants | 6 | Original Data in Error - Not a listable entity | 6 | US | P | Entire |
| Echinocereus viridiflorus correllii | Correll's green pitaya | Pitaya, Correll's green | Q0OT | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus viridiflorus cylindricus | Golden-spined hedgehog cactus | Hedgehog cactus, golden-spined | Q0OL | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinocereus viridiflorus var. davisii | Davis' green pitaya | Pitaya, Davis' green | Q1W0 | P01 | TX; U.S.A. (TX) | Cactaceae | Dec 08, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Echinodorus tenellus | No common name | No common name | Q32W | P01 | KS; | Alismataceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Echinomastus erectocentrus erectocentrus | No common name | No common name | Q0OV | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Echinomastus erectocentrus var. acunensis | Acuna Cactus | Cactus, Acuna | Q0OU | P01 | AZ; | Cactaceae | Oct 31, 2013 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Echinomastus mariposensis | Lloyd's Mariposa cactus | Cactus, Lloyd's Mariposa | Q1W2 | P01 | TX; Mexico-Coahuila; U.S.A. (TX), Mexico (Coahuila) | Cactaceae | Dec 06, 1979 | Flowering Plants | 2 | Threatened | 2 | US/Foreign | P | Wherever found |
| Ectemnius bidecoratus | Bidecoratus sphecid wasp | Sphecid wasp, bidecoratus | I0E0 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectemnius curtipes | Short-foot ectemnius sphecid wasp | Sphecid wasp, short-foot ectemnius | I0E1 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectemnius fulvicrus | Brown cross ectemnius sphecid wasp | Sphecid wasp, brown cross ectemnius | I0E2 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectemnius giffardi | Giffard's ectemnius sphecid wasp | Sphecid wasp, Giffard's ectemnius | I0E3 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectemnius haleakalae | Haleakala ectemnius sphecid wasp | Sphecid wasp, Haleakala ectemnius | I0E4 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectemnius rubrocaudatus | Redtail sphecid wasp | Sphecid wasp, redtail | I0DX | I01 | HI; Possibly extinct,not reported since 1965 | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ectodemia castaneae | American chestnut nepticulid moth | Nepticulid moth, American chestnut | I0BI | I01 | MD; Possibly extinct,not reported since 1965 | Nepticulidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Ectodemia phleophaga | Phleophagan chestnut nepticulid moth | Nepticulid moth, phleophagan chestnut | I0BJ | I01 | MD; Possibly extinct,not reported since 1965 | Nepticulidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Efferia antiochi | Antioch efferian robberfly | Robberfly, Antioch efferian | I0CM | I01 | CA; | Asilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Egretta eulophotes | Chinese egret | Egret, Chinese | B01G | V01 | Korea, China | Ardeidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Egretta rufescens | Reddish egret | Egret, reddish | B06U | V01 | FL; Mexico,West Indies | Ardeidae | NA | Birds | 4 | Not Listed | 4 | US/Foreign | V | Wherever found |
| eidmannella bullata | No common name | No common name | J02Q | I01 | nesticidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| eidmannella delicata | No common name | No common name | J02R | I01 | nesticidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| eidmannella nasuta | No common name | No common name | J02S | I01 | nesticidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| eidmannella reclusa | No common name | No common name | J02T | I01 | nesticidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Elanoides forficatus | Swallow-tailed Kite | Kite, Swallow-tailed | B0GB | V01 | Accipitridae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Elanoides forficatus forficatus | American swallow-tailed kite | Kite, American swallow-tailed | B073 | V01 | AL, AR, FL, GA, IA, IL, KS, LA, MN, MO, MS, NC, NE, OK, SC, TN, TX, WI; Central America | Accipitridae | NA | Birds | 3 | Not Listed | 2, 3, 4, 6 | US/Foreign | V | Wherever found |
| elanus caeruleus | White-tailed kite | kite, White-tailed | B0EP | V01 | accipitridae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Elanus leucurus | White-tailed Kite | Kite, White-tailed | B0FT | V01 | Accipitridae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Elaphoglossum serpens | No common name | No common name | S01U | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Lomariopsidaceae | Jun 09, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Elaphrus viridis | Delta green ground beetle | Beetle, delta green ground | I01G | I01 | CA; U.S.A. (CA) | Carabidae | Aug 08, 1980 | Insects | 8 | Threatened | 8 | US | I | Wherever found |
| Elassoma alabamae | Spring pygmy sunfish | Sunfish, spring pygmy | E05B | V01 | AL; | Centrarchidae | Dec 02, 2013 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Elassoma boehlkei | Carolina pygmy sunfish | Sunfish, Carolina pygmy | E05A | V01 | NC, SC; | Centrarchidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Elassoma okatie | Bluebarred pygmy sunfish | Sunfish, bluebarred pygmy | E06V | V01 | SC; | Centrarchidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Eleocharis austrotexana | No common name | No common name | Q0OX | P01 | TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eleocharis brachycarpa | Short-fruited spikerush | Spikerush, short-fruited | Q2TB | P01 | TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Eleocharis cylindrica | Cylinder spikerush | Spikerush, cylinder | Q0OY | P01 | TX; | Cyperaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eleocharis wolfii | No common name | No common name | Q32X | P01 | IA, IL, IN, KS, LA, MN, MO, ND, NE, OH, WI; | Cyperaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 6 | US | P | Wherever found |
| Elephas maximus | Asian elephant | Elephant, Asian | A059 | V01 | Elephantidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Eleutherodactylus cochranae | Whistling Frog | Frog, Ramos bromeliad | D00V | V01 | PR, VI; | Leptodactylidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Eleutherodactylus cooki | Guajon | Guajon | D00X | V01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Leptodactylidae | Jun 11, 1997 | Amphibians | 4 | Threatened | 4 | US | V | Wherever found |
| Eleutherodactylus eneidae | Mottled coqui | Coqui, mottled | D021 | V01 | PR, VI; | Leptodactylidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Eleutherodactylus jasperi | Golden coqui | Coqui, golden | D00D | V01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Leptodactylidae | Nov 11, 1977 | Amphibians | 4 | Threatened | 4 | US | V | Wherever found |
| Eleutherodactylus juanariveroi | Llanero Coqui | Coqui, Llanero | D03V | V01 | PR; U.S.A. (PR) | Leptodactylidae | Oct 04, 2012 | Amphibians | 4 | Endangered | 4 | US | V | Wherever found |
| Eleutherodactylus karlschmidti | Web-footed coqui | Coqui, web-footed | D00P | V01 | PR, VI; | Leptodactylidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Eleutherodactylus schwartzi | Virgin Islands coqui | coqui, Virgin Islands | D048 | V01 | Virgin islands | Leptodactylidae | NA | Amphibians | Foreign | Not Listed | NA | Foreign | V | Wherever found |
| Elgaria panamintina | Panamint alligator lizard | Lizard, Panamint alligator | C05V | V01 | CA; | Anguidae | NA | Reptiles | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Elimia acuta | Acute elimia | Elimia, acute | G09A | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia alabamensis | Mud elimia | Elimia, mud | G05Z | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia albanyensis | Black-crest elima | Elima, black-crest | G01V | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia ampla | Ample elimia | Elimia, ample | G06C | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia annettae | Lily Shoals elimia | Elimia, Lily Shoals | G06D | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia arachnoidea | Spider elimia | elimia, Spider | G0G8 | I01 | TN, VA; | Pleuroceridae | NA | Snails | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Elimia aterina | Coal elimia | Elimia, coal | G09B | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia bellacrenata | Princess elimia | elimia, Princess | G0G9 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia bellula | Walnut elimia | Elimia, walnut | G060 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia boykiniana | Flaxen elimia | Elimia, flaxen | G061 | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia brevis | Short-spire elimia | Elimia, short-spire | G06E | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia cahawbensis | Cahaba elimia | Elimia, Cahaba | G06F | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia capillaris | Spindle elimia | Elimia, spindle | G062 | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia chiltonensis | Prune elimia | elimia, Prune | G0GA | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia cochliaris | Cockle elimia | elimia, Cockle | G0GB | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia crenatella | Lacy elimia (snail) | Elimia, lacy (snail) | G063 | I01 | AL; U.S.A. (AL) | Pleuroceridae | Oct 28, 1998 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Elimia cylindracea | Cylinder elimia | elimia, Cylinder | G0GC | I01 | AL, MS; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia fascinans | Banded elimia | Elimia, banded | G064 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia fusiformis | Fusiform elimia | Elimia, fusiform | G06G | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia gerhardti | Coldwater elimia | Elimia, coldwater | G06H | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia hartmaniana | High-spired elimia | Elimia, high-spired | G06I | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia haysiana | Silt elimia | Elimia, silt | G065 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia hydei | Gladiator elimia | Elimia, gladiator | G066 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia impressa | Constricted elimia | Elimia, constricted | G06J | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia interrupta | Knotty elimia | Elimia, knotty | G067 | I01 | NC, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia interveniens | Slowwater elimia | Elimia, slowwater | G068 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia jonesi | Hearty elimia | Elimia, hearty | G06K | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia lachryma | Nudulose Coosa river snail | snail, Nudulose Coosa river | G0CG | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia laeta | Ribbed elimia | Elimia, ribbed | G06L | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia melanoides | Black mudalia | Mudalia, black | G0C7 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia nassula | Round-rib elimia | Elimia, round-rib | G069 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia olivula | Caper elimia | Elimia, caper | G06A | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia perstriata | Engraved elimia | Elimia, engraved | G09D | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia pilsbryi | Rough-lined elimia | Elimia, rough-lined | G06M | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia porrecta | Nymph elimia | Elimia, nymph | G09C | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia pupaeformis | Pupa elimia | Elimia, pupa | G06N | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia pybasi | Spring elimia | Elimia, spring | G09E | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia pygmaea | Pygmy elimia | Elimia, pygmy | G06O | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia showalteri | Compact elimia | Elimia, compact | G06P | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia strigosa | Brook elimia | Elimia, brook | G09F | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia teres | Elegant elimia | Elimia, elegant | G09G | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia troostiana | Mossy elimia | Elimia, mossy | G09H | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia vanuxemiana | Cobble elimia | Elimia, cobble | G06Q | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elimia varians | Puzzle elimia | Elimia, puzzle | G06B | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elimia variata | Squat elimia | Elimia, squat | G06R | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliottia racemosa | Georgia plume | Plume, Georgia | Q0OZ | P01 | GA, SC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Elliptio ahenea | Southern lance | lance, Southern | F04Q | I01 | FL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio arca | Alabama spike | spike, Alabama | F04R | I01 | AL, GA, LA, MS, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elliptio arctata | Delicate spike | spike, Delicate | F04S | I01 | AL, FL, GA, MS, SC, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Elliptio chipolaensis | Chipola slabshell | Slabshell, Chipola | F03O | I01 | AL, FL; Panhandle watersheds: Chipola upstream of Dead Lake; main channel of the Chipola River and its larger tributaries; prefers muddy sand and sandy clay substrates, but also found in silty sand substrates; U.S.A. (FL, AL) | Unionidae | Mar 16, 1998 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Elliptio fraterna | Brother spike | spike, Brother | F04T | I01 | AL, GA, SC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio judithae | Neuse slabshell | Slabshell, Neuse | F03L | I01 | NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio lanceolata | Yellow lance | Lance, yellow | F03I | I01 | NC, VA; The Yellow Lance has a historical range from the Patuxent River Basin in Maryland to the Neuse River Basin in North Carolina and has been documented from multiple physiographic provinces, from the foothills of the Appalachian Mountains through the Piedmont and into the Coastal Plain, from small streams (like Johns Creek) to large rivers (like the Tar River). | Unionidae | May 03, 2018 | Clams | 4 | Threatened | 4, 5 | US | I | Wherever found |
| Elliptio marsupiobesa | Cape Fear spike | Spike, Cape Fear | F024 | I01 | NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio mcmichaeli | Fluted Elephantear | Elephantear, fluted | F048 | I01 | AL, FL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio monroensis | St. Johns elephantear | Elephantear, St. Johns | F03P | I01 | FL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio nigella | Winged spike | Winged spike | F02A | I01 | AL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio purpurella | Inflated spike | spike, Inflated | F04U | I01 | AL, FL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio shepardiana | Altamaha lance | Lance, Altamaha | F02O | I01 | GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio sp. | Waccamaw lance | Lance, Waccamaw | F01P | I01 | NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio spinosa | Altamaha Spinymussel | Spinymussel, Altamaha | F026 | I01 | GA; U.S.A. (GA) | Unionidae | Nov 10, 2011 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Elliptio steinstansana | Tar River spinymussel | Spinymussel, Tar River | F015 | I01 | NC; U.S.A. (NC) | Unionidae | Jun 27, 1985 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Elliptio waccamawensis | Waccamaw spike | Spike, Waccamaw | F023 | I01 | NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptio waltoni | Florida lance | Lance, Florida | F03S | I01 | FL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Elliptoideus sloatianus | Purple bankclimber (mussel) | Bankclimber, purple (mussel) | F02E | I01 | AL, FL, GA; Panhandle Florida watersheds: Apalachicola and Ochlockonee; small to large rivers in slow to moderate currents over sand, sand mixed with mud or gravel substrates; U.S.A. (GA, FL, AL) | Unionidae | Mar 16, 1998 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Elodea bifoliata | Nevada waterweed | Waterweed, Nevada | Q0P2 | P01 | NV; | Hydrocharitaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Elodea brandegeae | Truckee waterweed | Waterweed, Truckee | Q0P0 | P01 | CA; Believed to be extinct | Hydrocharitaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Elodea canadensis | Nashville waterweed | Waterweed, Nashville | Q0P1 | P01 | TN; | Hydrocharitaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Elodea schweinitzii | Schweinitz's waterweed | Waterweed, Schweinitz's | Q0P3 | P01 | NY, PA; Possibly extinct | Hydrocharitaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Elymus californicus | California bottlebrush grass | Bottlebrush grass, California | Q0P4 | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Elymus svensonii | No common name | No common name | Q2TC | P01 | KY, TN; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Elytraria caroliniensis angustifolia | Narrowleaf Carolina scalystem | scalystem, Narrowleaf Carolina | Q0P5 | P01 | FL; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Elytraria caroliniensis caroliniensis | No common name | No common name | Q295 | P01 | FL, GA, SC; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Emballonura semicaudata rotensis | Pacific sheath-tailed Bat | Bat, Pacific sheath-tailed | A0I9 | V01 | MP; | Emballonuridae | Nov 02, 2015 | Mammals | 1 | Endangered | 1 | US/Foreign | V | Wherever found |
| Emballonura semicaudata semicaudata | Pacific sheath-tailed Bat | Bat, Pacific sheath-tailed | A0FO | V01 | AS; Caroline Islands | Emballonuridae | Oct 24, 2016 | Mammals | 1 | Endangered | 1 | US | V | American Samoa |
| Emballonura semicaudata semicaudata | Sheath-tailed Bat | Bat, sheath-tailed | A0IA | V01 | GU, MP, PW; | Emballonuridae | NA | Mammals | 1 | Not Listed | 1 | US/Foreign | V | Wherever found |
| Embelia pacifica | No common name | No common name | Q296 | P01 | HI; | Myrsinaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Emoia slevini | Slevin's skink | skink, Slevin's | C07T | V01 | GU, MP; | Scincidae | Nov 02, 2015 | Reptiles | 1 | Endangered | 1 | US | V | Wherever found |
| Empetrichthys latos | Pahrump poolfish | Poolfish, Pahrump | E007 | V01 | NV; U.S.A. (NV) | Cyprinodontidae | Mar 11, 1967 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Empetrichthys merriami | Ash Meadows poolfish | Poolfish, Ash Meadows | E05E | V01 | NV; Believed to be extinct | Cyprinodontidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Empicoris pulchrus | Pulchrus thread bug | Thread bug, pulchrus | I0EP | I01 | HI; Possibly extinct,not reported since 1965 | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Empidonax euleri johnstonei | Euler's flycatcher | Flycatcher, Euler's | B01J | V01 | West Indies-Grenada | Tyrannidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Empidonax fulvifrons | Buff-breasted Flycatcher | Flycatcher, Buff-breasted | B0KQ | V01 | Tyrannidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Empidonax fulvifrons pygmaeus | Buff-breasted flycatcher | Flycatcher, buff-breasted | B0AD | V01 | AZ, NM; | Tyrannidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Empidonax traillii | Willow Flycatcher | Flycatcher, Willow | B0F6 | V01 | Tyrannidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Empidonax traillii brewsteri | Little willow flycatcher | Flycatcher, little willow | B0AM | V01 | CA, OR, WA; Canada (British Columbia) | Tyrannidae | NA | Birds | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Empidonax traillii extimus | Southwestern willow flycatcher | Flycatcher, southwestern willow | B094 | V01 | AZ, CA, CO, NM, NV, TX, UT; Central America; U.S.A. (UT, TX, NM, CO, CA, AZ), Mexico | Tyrannidae | Feb 27, 1995 | Birds | 2 | Endangered | 2, 6, 8 | US/Foreign | V | Wherever found |
| Emydoidea blandingii | Blanding's turtle | Turtle, Blanding's | C05M | V01 | IA, IL, IN, MI, MN, NE, NY, OH, PA, SD, WI, WY; | Emydidae | NA | Reptiles | 6 | Under Review in the Candidate or Petition Process | 3, 5, 6 | US | V | Wherever found |
| Enallagma laterale | Lateral bluet | Bluet, lateral | I0P2 | I01 | DE, IN, MA, ME, NJ, NY, PA; | Coenagrionidae | NA | Insects | 5 | Not Listed | 3, 5 | US | I | Wherever found |
| Enallagma recurvatum | Barrens bluet damselfly | Damselfly, Barrens bluet | I05T | I01 | DE, MA, NJ, NY; | Coenagrionidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Encelia frutescens resinosa | No common name | No common name | Q0P6 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Enceliopsis covillei | Panamint daisy | Daisy, Panamint | Q0P7 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Enceliopsis nudicaulis var. corrugata | Ash Meadows sunray | Sunray, Ash Meadows | Q297 | P01 | CA, NV; U.S.A. (NV) | Asteraceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Encyclia boothiana erythronioides | Dollar orchid | Orchid, dollar | Q0P8 | P01 | FL; Bahamas,Belize,Cuba,Dominican Republic,Haiti,Jamaica,Mexico,South America | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Encyclia cochleata var. triandra | Clam-shell orchid | orchid, Clam-shell | Q3P8 | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Encyclia kranzlinii | No common name | No common name | Q32Y | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Encyclia oncidioides | No common name | No common name | Q0PA | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Enhydra lutris kenyoni | Northern Sea Otter | Otter, Northern Sea | A0HK | V01 | AK; Coastal waters and shoreline from west side of Cook Inlet west throughout the Kodiak Archipelago, Alaska Peninsula and Aleutian Islands, north to Egegik Bay.; Southwest Alaska, from Attu Island to Western Cook Inlet, including Bristol Bay, the Kodiak Archipelago, and the Barren Islands | Mustelidae | Aug 09, 2005 | Mammals | 7 | Threatened | 7 | US | V | Southwest Alaska, from Attu Island to Western Cook Inlet, including Bristol Bay, the Kodiak Archipelago, and the Barren Islands |
| Enhydra lutris nereis | Southern sea otter | Otter, southern sea | A0A7 | V01 | CA; West Coast, U.S.A.(CA,OR,WA) south to Mexico(Baja California) | Mustelidae | Jan 14, 1977 | Mammals | 8 | Threatened | 8 | US/Foreign | V | Wherever found |
| Ensatina eschscholtzii croceator | Yellow-blotched ensatina | Ensatina, yellow-blotched | D02M | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Ensatina eschscholtzii klauberi | Large-blotched ensatina | Ensatina, large-blotched | D02L | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Eobrachycentrus gelidae | Mt. Hood primitive brachycentrid caddisfly | Caddisfly, Mt. Hood primitive brachycentrid | I042 | I01 | OR; | Brachycentridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes ambiguus | Ambiguous eopenthes click beetle | Click beetle, ambiguous eopenthes | I04N | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes arduus | Arduous eopenthes click beetle | Click beetle, arduous eopenthes | I04O | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes auratus | Golden eopenthes click beetle | Click beetle, golden eopenthes | I04P | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes celatus | Hidden eopenthes click beetle | Click beetle, hidden eopenthes | I04Q | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes cognatus | Cognatus eopenthes click beetle | Click beetle, cognatus eopenthes | I04R | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes debilis | Weak eopenthes click beetle | Click beetle, weak eopenthes | I04S | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes deceptor | Deceptive eopenthes click beetle | Click beetle, deceptive eopenthes | I04T | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes funebris | Death eopenthes click beetle | Click beetle, death eopenthes | I04U | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes germanus | Germanus eopenthes click beetle | Click beetle, germanus eopenthes | I04V | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes kauaiensis | Kauai eopenthes click beetle | Click beetle, Kauai eopenthes | I04W | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes muticus | Muticus eopenthes click beetle | Click beetle, muticus eopenthes | I04X | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes pallipes | Pallipes eopenthes click beetle | Click beetle, pallipes eopenthes | I04Y | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes plebeius | Common eopenthes click beetle | Click beetle, common eopenthes | I04Z | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes politus | Politus eopenthes click beetle | Click beetle, politus eopenthes | I050 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes tarsalis | Tarsalis eopenthes click beetle | Click beetle, tarsalis eopenthes | I051 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes tinctus | Tinged eopenthes click beetle | Click beetle, tinged eopenthes | I052 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Eopenthes unicolor | Unicolored eopenthes click beetle | Click beetle, unicolored eopenthes | I053 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ephedra funerea | Funeral ephedra | Ephedra, funeral | R008 | P01 | CA, NV; | Ephedraceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Ephemera compar | Colorado burrowing mayfly | Mayfly, Colorado burrowing | I09R | I01 | CO; Believed to be extinct | Ephemeridae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Ephemera triplex | West Virginia burrowing mayfly | Mayfly, West Virginia burrowing | I0A0 | I01 | WV; Possibly extinct,not reported since 1965 | Ephemeridae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Ephemerella apopsis | No common name | No common name | I0V6 | I01 | Ephemerellidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Ephemerella argo | Argo ephemerellan mayfly | Mayfly, argo ephemerellan | I09N | I01 | GA, IL, IN, SC; | Ephemerellidae | NA | Insects | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Ephydatia subtilis | Kissimmee sponge | Sponge, Kissimmee | O001 | I01 | FL; | Spongillidae | NA | Sponges | 4 | Not Listed | 4 | US | I | Wherever found |
| Epicrates inornatus | Puerto Rican boa | Boa, Puerto Rican | C00P | V01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Boidae | Oct 13, 1970 | Reptiles | 4 | Endangered | 4 | US | V | Wherever found |
| Epicrates monensis granti | Virgin Islands tree boa | Boa, Virgin Islands tree | C02E | V01 | PR, VI; British Virgin Islands (presumed extirpated in US Virgin Is.); Puerto Rico and Virgin Islands; Puerto Rico, US. Virgin Island and British Virgin Islands. | Boidae | Oct 13, 1970 | Reptiles | 4 | Endangered | 4 | US/Foreign | V | Wherever found |
| Epicrates monensis monensis | Mona boa | Boa, Mona | C01Q | V01 | PR; Endemic to Mona Island; U.S.A. (PR) | Boidae | Mar 06, 1978 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Epicrates subflavus | Jamaican boa | Boa, Jamaican | C003 | V01 | Jamaica | Boidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Epidendrum brittonianum | No common name | No common name | Q0PB | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Epidendrum lacerum | No common name | No common name | Q0PC | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Epidendrum strobiliferum | Big cypress epidendrum | epidendrum, Big cypress | Q3P9 | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Epilobium nevadense | Nevada willowherb | Willowherb, Nevada | Q0PD | P01 | NV, UT; | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Epilobium nivium | Snow Mountain willowherb | Willowherb, Snow Mountain | Q0PE | P01 | CA; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Epilobium oreganum | Oregon fireweed | Fireweed, Oregon | Q0PF | P01 | CA, OR; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Epilobium siskiyouense | Siskiyou rock-fringe | Rock-fringe, Siskiyou | Q299 | P01 | CA, OR; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Epinephelus striatus | Nassau grouper | grouper, Nassau | E0DA | V01 | Serranidae | NA | Fishes | NMFS | Threatened | NA | US/Foreign | V | Entire | |
| Epioblasma arcaeformis | Sugarspoon | Sugarspoon | F028 | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma biemarginata | Angled riffleshell | Riffleshell, angled | F021 | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma brevidens | Cumberlandian combshell | Combshell, Cumberlandian | F01F | I01 | KY, MS, TN, VA; U.S.A. (VA, TN, MS, KY, AL) | Unionidae | Jan 10, 1997 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma brevidens | Cumberlandian combshell | Combshell, Cumberlandian | F01F | I02 | U.S.A. (VA, TN, MS, KY, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epioblasma brevidens | Cumberlandian combshell | Combshell, Cumberlandian | F01F | I03 | U.S.A. (VA, TN, MS, KY, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Epioblasma capsaeformis | Oyster mussel | Mussel, oyster | F01T | I01 | AL, KY, TN, VA; U.S.A. (VA, TN, NC, KY, GA, AL) | Unionidae | Jan 10, 1997 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma capsaeformis | Oyster mussel | Mussel, oyster | F01T | I02 | AL; U.S.A. (VA, TN, NC, MS, KY, GA, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epioblasma capsaeformis | Oyster mussel | Mussel, oyster | F01T | I03 | U.S.A. (VA, TN, NC, MS, KY, GA, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Epioblasma flexuosa | Leafshell | Leafshell | F01Q | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma florentina curtisii | Curtis pearlymussel | Pearlymussel, Curtis | F00J | I01 | AR, MO; U.S.A. (MO, AR) | Unionidae | Jun 14, 1976 | Clams | 3 | Endangered | 3, 4 | US | I | Wherever found |
| Epioblasma florentina florentina | Yellow blossom (pearlymussel) | Blossom, yellow (pearlymussel) | F005 | I01 | TN; Possibly extinct,not reported since 1970; U.S.A. (TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma florentina florentina | Yellow blossom (pearlymussel) | Blossom, yellow (pearlymussel) | F005 | I02 | AL; U.S.A. (TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epioblasma florentina walkeri (=E. walkeri) | Tan riffleshell | Riffleshell, tan | F010 | I01 | AL, KY, LA, MS, NC, TN, VA; U.S.A. (VA, TN, NC, KY, AL) | Unionidae | Sep 26, 1977 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Epioblasma haysiana | Acornshell | Acornshell | F017 | I01 | AL, TN, VA; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Epioblasma lefevrei | Lefevre's pearly mussel | Mussel, Lefevre's pearly | F00H | I01 | AR, MO; | Unionidae | NA | Clams | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Epioblasma lenior | Narrow catspaw | Catspaw, narrow | F01C | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma lewisii | Forkshell | Forkshell | F01M | I01 | AL, KY, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma metastriata | Upland combshell | Combshell, upland | F02F | I01 | AL, TN; Possibly extinct, no populations have been confirmed in recent years; U.S.A. (TN, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Epioblasma obliquata obliquata | Purple Cat's paw (=Purple Cat's paw pearlymussel) | Purple cat's paw (=purple cat's paw pearlymussel) | F006 | I02 | AL, IL, KY, OH; U.S.A. (TN, OH, KY, IN, IL, AL) | Unionidae | Jun 14, 2001 | Clams | 3 | Experimental Population, Non-Essential | 3, 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epioblasma obliquata obliquata | Purple Cat's paw (=Purple Cat's paw pearlymussel) | Purple Cat's paw (=Purple Cat's paw pearlymussel) | F006 | I01 | AL, KY, OH; U.S.A. (TN, OH, KY, IN, IL, AL) | Unionidae | Jul 10, 1990 | Clams | 3 | Endangered | 3, 4 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma obliquata perobliqua | White catspaw (pearlymussel) | Catspaw, white (pearlymussel) | F007 | I01 | IN, OH; U.S.A. (OH, MI, IN) | Unionidae | Jun 14, 1976 | Clams | 3 | Endangered | 3 | US | I | Wherever found |
| Epioblasma othcaloogensis | Southern acornshell | Acornshell, southern | F02D | I01 | AL, GA, TN; Possibly extinct, no populations have been confirmed in recent years; U.S.A. (TN, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Epioblasma penita | Southern combshell | Combshell, southern | F012 | I01 | AL, MS; U.S.A. (MS, AL) | Unionidae | Apr 07, 1987 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Epioblasma personata | Round combshell | Combshell, round | F01G | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma propinqua | Tennessee riffleshell | Riffleshell, Tennessee | F022 | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma sampsoni | Sampson's pearlymussel | Pearlymussel, Sampson's | F00N | I01 | IL, IN; Believed to be extinct | Unionidae | Jun 14, 1976 | Clams | 3 | Extinction | 3 | US | I | Wherever found |
| Epioblasma stewardsonii | Cumberland leafshell | Leafshell, Cumberland | F01R | I01 | AL, TN; Believed to be extinct | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Epioblasma torulosa gubernaculum | Green blossom (pearlymussel) | Blossom, green (pearlymussel) | F002 | I01 | TN, VA; U.S.A. (VA, TN) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Epioblasma torulosa rangiana | Northern riffleshell | Riffleshell, northern | F02Z | I01 | IL, IN, KY, MI, OH, PA, WV; U.S.A. (WV, PA, OH, MI, KY, IN, IL), Canada (ON) | Unionidae | Jan 22, 1993 | Clams | 5 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Epioblasma torulosa torulosa | Tubercled blossom (pearlymussel) | Blossom, tubercled (pearlymussel) | F003 | I01 | GA, TN, WV; Possibly extinct; U.S.A. (WV, TN, KY, IN, IL, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma torulosa torulosa | Tubercled blossom (pearlymussel) | Blossom, tubercled (pearlymussel) | F003 | I02 | AL; U.S.A. (WV, TN, KY, IN, IL, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epioblasma triquetra | Snuffbox mussel | Mussel, snuffbox | F03J | I01 | AL, AR, IL, IN, KY, MI, MN, MO, MS, OH, PA, TN, VA, WI, WV; ; Entire | Unionidae | Mar 15, 2012 | Clams | 3 | Endangered | 3, 4, 5 | US/Foreign | I | Wherever found |
| Epioblasma turgidula | Turgid blossom (pearlymussel) | Blossom, turgid (pearlymussel) | F004 | I01 | AR, TN; Entire Range; Except where listed as Experimental Populations; Possibly extinct,not reported since mid 60's | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4 | US | I | Wherever found; Except where listed as Experimental Populations |
| Epioblasma turgidula | Turgid blossom (pearlymussel) | Blossom, turgid (pearlymussel) | F004 | I02 | AL; U.S.A. (TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Epithelantha bokei | Boke's button cactus | Button cactus, Boke's | Q0PG | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| eptesicus fuscus | Big brown bat | bat, Big brown | A0IN | V01 | vespertilionidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Equus africanus | African wild ass | Ass, African wild | A00M | V01 | Ethiopia, Somalia, Sudan | Equidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Equus caballus | Horse | Horse, wild | A0KW | V01 | AZ, CA, ID, MT, NM, NV, OK, UT, WY; | Equidae | NA | Mammals | 8 | Not Listed | 1, 2, 6, 8 | US | V | Wherever found |
| Equus grevyi | Grevy's zebra | Zebra, Grevy's | A077 | V01 | Somalia, Kenya, Ethiopia | Equidae | Sep 20, 1979 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Equus hemionus | Asian wild ass | Ass, Asian wild | A00N | V01 | Entire | Equidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Equus przewalskii | Przewalski's horse | Horse, Przewalski's | A05E | V01 | Wherever found | Equidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Equus zebra hartmannae | Hartmann's mountain zebra | Zebra, Hartmann's mountain | A078 | V01 | Namibia, Angola | Equidae | Sep 20, 1979 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Equus zebra ssp. zebra | Cape Mountain zebra | zebra, Cape Mountain | A0LA | V01 | Equidae | NA | Mammals | Foreign | Endangered | NA | Foreign | V | Entire | |
| Equus zebra zebra | Mountain zebra | Zebra, mountain | A06A | V01 | South Africa | Equidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Eragrostis deflexa | No common name | No common name | Q32Z | P01 | HI; Believed to be extinct | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eragrostis fosbergii | Fosberg's love grass | Love grass, Fosberg's | Q0PH | P01 | HI; U.S.A. (HI) | Poaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Eragrostis leptostachya | No common name | No common name | Q330 | P01 | HI; Possibly extinct,last observed in 1937. | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eragrostis mauiensis | Maui love grass | Love grass, Maui | Q0PI | P01 | HI; Believed to be extinct | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eragrostis paupera | No common name | No common name | Q0PK | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eragrostis pectinacea | Sanibel love grass | Love grass, Sanibel | Q0PL | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eragrostis variabilis | Ni`ihau love grass | Love grass, Ni`ihau | Q0PJ | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eremalche kernensis | Kern mallow | Mallow, Kern | Q2TD | P01 | CA; U.S.A. (CA) | Malvaceae | Jul 19, 1990 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eremarionta immaculata | White desertsnail | Desertsnail, white | G01S | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Eremarionta millepalmarum | Thousand Palms desertsnail | Desertsnail, Thousand Palms | G04J | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Eremarionta morongoana | Morongo desertsnail | Desertsnail, Morongo | G01T | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Eremichthys acros | Desert dace | Dace, desert | E03C | V01 | NV; U.S.A. (NV) | Cyprinidae | Mar 11, 1967 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Eremophila alpestris actia | California horned lark | Lark, California horned | B097 | V01 | CA; | Alaudidae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Eremophila alpestris strigata | Streaked Horned lark | Horned lark, streaked | B0B3 | V01 | OR, WA; | Alaudidae | Nov 04, 2013 | Birds | 1 | Threatened | 1 | US | V | Wherever found |
| Eretmochelys imbricata | Hawksbill sea turtle | Sea turtle, hawksbill | C00E | V01 | AL, AS, CT, DE, FL, GA, GU, HI, LA, MA, MD, ME, MP, MS, NC, NH, NJ, NY, PR, PW, RI, TX, VA, VI; Palau,tropical seas; Tropical and subtropical regions of the Atlantic, Pacific, and Indian Oceans. | Cheloniidae | Jun 02, 1970 | Reptiles | 4 | Endangered | 1, 2, 4, 5 | US/Foreign | V | Wherever found |
| Eriastrum brandegeeae | Brandegee eriastrum | Eriastrum, brandegee | Q0PM | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriastrum densifolium ssp. sanctorum | Santa Ana River woolly-star | Woolly-star, Santa Ana River | Q29A | P01 | CA; U.S.A. (CA) | Polemoniaceae | Sep 28, 1987 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriastrum hooveri | Hoover's woolly-star | Woolly-star, Hoover's | Q2TE | P01 | CA; | Polemoniaceae | Jul 19, 1990 | Flowering Plants | 8 | Recovery | 8 | US | P | Entire |
| Ericameria cervina | No common name | No common name | Q2AS | P01 | AZ, NV, UT; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Ericameria crispa | No common name | No common name | Q33T | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ericameria fasciculata | Eastwood's goldenweed | Goldenweed, Eastwood's | Q0PN | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ericameria lignumviridis | Greenwood's Heath goldenrod | goldenrod Greenwood's Heath | Q3LZ | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Ericameria nauseosa var. iridis | No common name | No common name | Q3C6 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ericameria ophitidis | Serpentine haplopappus | Haplopappus, serpentine | Q0XH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ericameria palmeri ssp. palmeri | Palmer's goldenbush | Goldenbush, Palmer's | Q3IT | P01 | Asteraceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Ericameria watsonii | No common name | No common name | Q2AW | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ericameria zionis | No common name | No common name | Q33W | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron abajoensis | Abajo daisy | Daisy, Abajo | Q0PO | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron acomanus | Acoma fleabane | Fleabane, Acoma | Q331 | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron aequifolius | Hall's daisy | Daisy, Hall's | Q0PP | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron allocotus | Branched fleabane | Fleabane, branched | Q0PQ | P01 | MT, WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron anchana | Mogollon fleabane | Fleabane, Mogollon | Q3CV | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron arenarioides | No common name | No common name | Q0PR | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron arizonicus | No common name | No common name | Q0PS | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron awapensis | Awapa Daisy | Daisy Awapa | Q3M0 | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Erigeron basalticus | Basalt daisy | Daisy, basalt | Q0PT | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron bigelovii | No common name | No common name | Q0PU | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron bloomeri nudatus | Waldo daisy | Daisy, Waldo | Q0PV | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Erigeron calvus | [Unnamed] fleabane | Fleabane, [unnamed] | Q0PW | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron canaanii | No common name | No common name | Q332 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron carringtonae | No common name | No common name | Q333 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron cervinus | Del Norte fleabane | Fleabane, Del Norte | Q0PY | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Erigeron chrysopsidis brevifolius | No common name | No common name | Q29B | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron cronquistii | Cronquist daisy | Daisy, Cronquist | Q0PX | P01 | ID, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 1, 6 | US | P | Wherever found |
| Erigeron decumbens | Willamette daisy | Daisy, Willamette | Q2TF | P01 | OR; U.S.A. (OR) | Asteraceae | Jan 25, 2000 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Erigeron flettii | No common name | No common name | Q0Q0 | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron flexuosus | Trinity Alps daisy | Daisy, Trinity Alps | Q0Q1 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron foliosus blochmaniae | Blockman's leafy-daisy | Leafy-daisy, Blockman's | Q0Q2 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron garrettii | No common name | No common name | Q0Q3 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron heligraphicus | Pinalenos fleabane | Fleabane, Pinalenos | Q3CW | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron hessii | Hess's fleabane | Fleabane, Hess's | Q3CX | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron howellii | Howell's fleabane | Fleabane, Howell's | Q0Q4 | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron hultenii | No common name | No common name | Q0Q5 | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Erigeron kachinensis | Kachina daisy | Daisy, Kachina | Q0Q6 | P01 | CO, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron kuschei | Chiricahua fleabane | Fleabane, Chiricahua | Q0Q7 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron lackshewitz | No common name | No common name | Q334 | P01 | MT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron latus | [Unnamed] fleabane | Fleabane, [unnamed] | Q0Q8 | P01 | ID, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Erigeron leibergii | No common name | No common name | Q0Q9 | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron lemmonii | Lemmon fleabane | Fleabane, Lemmon | Q0QA | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron lobatus | No common name | No common name | Q0QB | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron maguirei | Maguire daisy | Daisy, Maguire | Q1W3 | P01 | UT; The species occurs from the San Rafael Swell in Emery County, Utah, south into Wayne and Garfield Counties, Utah, through the Waterpocket Fold in Capitol Reef National Park (Capitol Reef) (Heil 1987, p. 5, figure 5; Heil 1989, p. 26; Kass 1990, pp. 23, 26–27; Harper and Van Buren 1998, appendix A; Clark 2001, p. 3; Clark 2002, pp. 13–14; Clark et al. 2005, p. 7; Clark et al. 2006, p. 7). | Asteraceae | Sep 05, 1985 | Flowering Plants | 6 | Recovery | 6 | US | P | Wherever found |
| Erigeron maguirei harrisonii | No common name | No common name | Q0QC | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron mancus | Depauperate daisy | Daisy, depauperate | Q0QD | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron muirii | No common name | No common name | Q29C | P01 | AK; | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Erigeron multiceps | Kern River daisy | Daisy, Kern River | Q0QF | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron oreganus | Gorge fleabane | Fleabane, Gorge | Q0QG | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron ovinus | No common name | No common name | Q0QH | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron parishii | Parish's daisy | Daisy, Parish's | Q29D | P01 | CA; U.S.A. (CA) | Asteraceae | Aug 24, 1994 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Erigeron perglaber | No common name | No common name | Q29E | P01 | AZ; Believed to be extinct | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron piperanus | No common name | No common name | Q0QI | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron piscaticus | Fish Creek fleabane | Fleabane, Fish Creek | Q3CY | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Erigeron pringlei | No common name | No common name | Q0QJ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron proselyticus | Cliff daisy | Daisy, cliff | Q29F | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron pulchellus tolsteadii | No common name | No common name | Q0QK | P01 | MN; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Erigeron religiosus | Clear Creek fleabane | Fleabane, Clear Creek | Q0QL | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron rhizomatus | Zuni fleabane | Fleabane, Zuni | Q1W4 | P01 | AZ, NM; Entire | Asteraceae | Apr 26, 1985 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Erigeron salmonensis | No common name | No common name | Q335 | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erigeron sionis | No common name | No common name | Q0QM | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron sivinskii | No common name | No common name | Q3CZ | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron sp. | Sp. nov. ined. erigeron | Erigeron, sp. nov. ined. | Q336 | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron supplex | Supple daisy | Daisy, supple | Q0QN | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron uncialis conjugans | No common name | No common name | Q0QO | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erigeron untermannii | No common name | No common name | Q2TG | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron versicolor | Sonora fleabane | Fleabane, Sonora | Q0QE | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Erigeron wilkenii | No common name | No common name | Q3D0 | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erigeron zothecinus | No common name | No common name | Q337 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Erignathus barbatus nauticus | bearded Seal | Seal, bearded | A0KM | V02 | Phocidae | Feb 26, 2013 | Mammals | NMFS | Threatened | NA | US | V | Beringia DPS - See 50 CFR 223.102 | |
| Erignathus barbatus nauticus | bearded Seal | Seal, bearded | A0KM | V03 | Phocidae | Feb 26, 2013 | Mammals | NMFS | Threatened | NA | US | V | Okhotsk DPS - See 50 CFR 223.102 | |
| Erimonax monachus | Spotfin Chub | Chub, spotfin | E012 | V01 | AL, NC, TN, VA; U.S.A. (VA, TN, NC, GA, AL) | Cyprinidae | Oct 11, 1977 | Fishes | 4 | Threatened | 4, 5 | US | V | Wherever found, except where listed as an experimental population |
| Erimonax monachus | Spotfin Chub | Chub, spotfin | E012 | V02 | TN; U.S.A. (VA, TN, NC, GA, AL) | Cyprinidae | Aug 12, 2002 | Fishes | 4 | Experimental Population, Non-Essential | 4 | US | V | U.S.A. (TN-specified portions of the Tellico River; see 17.84(m)(1)(i)) |
| Erimonax monachus | Spotfin Chub | Chub, spotfin | E012 | V03 | U.S.A. (VA, TN, NC, GA, AL) | Cyprinidae | Apr 08, 2005 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (AL, TN-specified portions of Shoal Creek; see 17.84(m)(1)(ii)) |
| Erimonax monachus | Spotfin Chub | Chub, spotfin | E012 | V04 | U.S.A. (VA, TN, NC, GA, AL) | Cyprinidae | Oct 15, 2007 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (TN-specified portions of the French Broad and Holston Rivers; see 17.84(m)(1)(iii)) |
| Erimystax cahni | Slender chub | Chub, slender | E01X | V01 | TN, VA; U.S.A. (VA, TN) | Cyprinidae | Oct 11, 1977 | Fishes | 4 | Threatened | 4, 5 | US | V | Wherever found |
| Erimystax cahni | Slender chub | Chub, slender | E01X | V02 | U.S.A. (VA, TN) | Cyprinidae | Oct 15, 2007 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(s)(1)(i)) |
| Erimystax harryi | Ozark chub | chub, Ozark | E0CN | V01 | AR, MO; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 3, 4 | US | V | Wherever found |
| Erinna newcombi | Newcomb's snail | Snail, Newcomb's | G0C0 | I01 | HI; U.S.A. (HI) | Lymnaeidae | Jan 26, 2000 | Snails | 1 | Threatened | 1 | US | I | Wherever found |
| Eriocaulon kornickianum | Small-headed pipewort | Pipewort, small-headed | Q0QP | P01 | AR, GA, OK, TX; | Eriocaulaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | P | Wherever found |
| Eriocaulon nigrobracteatum | Blackbract pipewort | Pipewort, Blackbract | Q3MK | P01 | FL; | Eriocaulaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Eriocaulon parkeri | Parker's pipewort | Pipewort, Parker's | Q2OO | P01 | CT, DC, DE, MA, MD, ME, NC, NJ, NY, PA, VA; Canada (N.B,Que.) | Eriocaulaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Eriochloa michauxii simpsonii | No common name | No common name | Q0QQ | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eriocnemis nigrivestis | Black-breasted puffleg | Puffleg, black-breasted | B0BQ | V01 | Trochilidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Eriocnemis nigrivestis | black-breasted puffleg | Puffleg, black-breasted | B0GF | V01 | South America, Ecuador | Trochilidae | Aug 26, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Eriodictyon altissimum | Indian Knob mountainbalm | mountainbalm, Indian Knob | Q1W5 | P01 | CA; U.S.A. (CA) | Boraginaceae | Dec 15, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriodictyon capitatum | Lompoc yerba santa | Yerba santa, Lompoc | Q0QR | P01 | CA; U.S.A. (CA) | Hydrophyllaceae | Mar 20, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriogonum aliquantum | Cimarron wild-buckwheat | Wild-buckwheat, Cimarron | Q338 | P01 | NM; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum allenii | No common name | No common name | Q29G | P01 | VA, WV; | Polygonaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Eriogonum alpinum | Trinity buckwheat | Buckwheat, Trinity | Q0QS | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum ammophilum | Sand-loving wild-buckwheat | Wild-buckwheat, sand-loving | Q0QT | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum ampullaceum | Mono buckwheat | Buckwheat, Mono | Q0QU | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum anemophilum | [Unnamed] buckwheat | Buckwheat, [unnamed] | Q1W6 | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum apachense | Apache wild-buckwheat | Wild-buckwheat, Apache | Q0QV | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum apricum (incl. var. prostratum) | Ione (incl. Irish Hill) buckwheat | Buckwheat, Ione (incl. Irish Hill) | Q0QW | P01 | CA; U.S.A. (CA) | Polygonaceae | May 26, 1999 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriogonum aretioides | Widstoe wild-buckwheat | Wild-buckwheat, Widstoe | Q0QX | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum argophyllum | Sulphur Springs buckwheat | Buckwheat, Sulphur Springs | Q0QY | P01 | NV; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum beatleyae | Beatley buckwheat | Buckwheat, Beatley | Q0QZ | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum bifurcatum | Forked buckwheat | Buckwheat, forked | Q0R0 | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum brandegeei | Brandegee wild-buckwheat | Wild-buckwheat, Brandegee | Q0R1 | P01 | CO; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum brandegeei | Brandegee's Wild Buckwheat | Buckwheat Brandegee's Wild | Q3M1 | P01 | Polygonaceae | NA | Flowering Plants | 6 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Eriogonum breedlovei breedlovei | Piute buckwheat | Buckwheat, Piute | Q0R2 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum breedlovei shevockii | The Needles buckwheat | Buckwheat, The Needles | Q0R3 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum butterworthianum | Butterworth's buckwheat | Buckwheat, Butterworth's | Q0R4 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum caninum | Tiburon buckwheat | Buckwheat, Tiburon | Q0R5 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum capillare | San Carlos wild-buckwheat | Wild-buckwheat, San Carlos | Q0R6 | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum chrysops | Golden buckwheat | Buckwheat, golden | Q0R7 | P01 | OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum clavellatum | Comb Wash wild-buckwheat | Wild-buckwheat, Comb Wash | Q0R8 | P01 | CO, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum codium | Umtanum Desert buckwheat | Buckwheat, Umtanum Desert | Q3HN | P01 | WA; | Polygonaceae | May 23, 2013 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Eriogonum concinnum | No common name | No common name | Q0R9 | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum congdonii | Congdon's buckwheat | Buckwheat, Congdon's | Q0RA | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum contiguum | Reveal's buckwheat | Buckwheat, Reveal's | Q0RB | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum correllii | No common name | No common name | Q0RC | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum corymbosum davidsei | Corymbed, Davidse wild-buckwheat | Wild-buckwheat, corymbed, Davidse | Q0RD | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum corymbosum matthewsae | Matthew's wild-buckwheat | Wild-buckwheat, Matthew's | Q29H | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum corymbosum revealianum | Corymbed, Reveal wild-buckwheat | Wild-buckwheat, corymbed, Reveal | Q0RE | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum corymbosum var. nilesii | Las Vegas buckwheat | buckwheat, Las Vegas | Q3MG | P01 | NV, UT; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 6, 8 | US | P | Wherever found |
| Eriogonum crocatum | Conejo buckwheat | Buckwheat, Conejo | Q0RF | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum cronquistii | Cronquist wild-buckwheat | Wild-buckwheat, Cronquist | Q0RG | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum crosbyae | Crosby's buckwheat | Buckwheat, Crosby's | Q29I | P01 | NV, OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Eriogonum cusickii | Cusick's buckwheat | Buckwheat, Cusick's | Q0RH | P01 | OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum darrovii | Darrov's wild-buckwheat | Wild-buckwheat, Darrov's | Q0RI | P01 | AZ, NV; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Eriogonum deserticola | Desert wild-buckwheat | Wild-buckwheat, desert | Q0RK | P01 | AZ, CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Eriogonum diatomaceum | Churchill Narrows buckwheat | Buckwheat, Churchill Narrows | Q3IP | P01 | NV; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum diclinum | Jaynes Canyon buckwheat | Buckwheat, Jaynes Canyon | Q0RL | P01 | CA, OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Eriogonum eastwoodianum | Eastwood's buckwheat | Buckwheat, Eastwood's | Q29J | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum ephedroides brevicaule | Ephedra wild-buckwheat | Wild-buckwheat, ephedra | Q0RM | P01 | CO, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum eremicola | Wild Rose Canyon buckwheat | Buckwheat, Wild Rose Canyon | Q0RN | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum eremicum | Limestone wild-buckwheat | Wild-buckwheat, limestone | Q0RO | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum ericifolium ericifolium | [Unnamed] wild-buckwheat | Wild-buckwheat, [unnamed] | Q0RQ | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum ericifolium thornei | Thorne's buckwheat | Buckwheat, Thorne's | Q0RP | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum flavum aquilinum | [Unnamed] wild-buckwheat | Wild-buckwheat, [unnamed] | Q0RR | P01 | AK; | Polygonaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Eriogonum giganteum compactum | Santa Barbara Island buckwheat | Buckwheat, Santa Barbara Island | Q0RS | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum giganteum formosum | San Clemente Island buckwheat | Buckwheat, San Clemente Island | Q2OP | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum gilmanii | Gilman's buckwheat | Buckwheat, Gilman's | Q0RT | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum gossypinum | Cottony buckwheat | Buckwheat, cottony | Q0RU | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum grande dunklei | San Miguel Island buckwheat | Buckwheat, San Miguel Island | Q29K | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum grande rubescens | Large red buckwheat | Buckwheat, large red | Q339 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum grande timorum | San Nicolas Island buckwheat | Buckwheat, San Nicolas Island | Q0RV | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum grayi | No common name | No common name | Q29L | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum gypsophilum | Gypsum wild-buckwheat | Wild-buckwheat, gypsum | Q1W7 | P01 | NM; U.S.A. (NM) | Polygonaceae | Jan 19, 1981 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Eriogonum heermannii floccosum | Clark Mountain buckwheat | Buckwheat, Clark Mountain | Q0RW | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum heermannii subracemosum | No common name | No common name | Q0RX | P01 | AZ, UT; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Eriogonum hirtellum | Klamath Mountain buckwheat | Buckwheat, Klamath Mountain | Q0RY | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum hoffmannii hoffmannii | Hoffmann's buckwheat | Buckwheat, Hoffmann's | Q0RZ | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum hoffmannii robustius | Robust Hoffmann's buckwheat | Buckwheat, robust Hoffmann's | Q0S0 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum holmgrenii | Holmgren's buckwheat | Buckwheat, Holmgren's | Q0S1 | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum hylophilum | Badlands wild-buckwheat | Wild-buckwheat, Badlands | Q0S2 | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum intrafractum | Jointed buckwheat | Buckwheat, jointed | Q0S3 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum jamesii rupicola | Sandstone wild-buckwheat | Wild-buckwheat, sandstone | Q0S5 | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum kelloggii | Red Mountain buckwheat | Buckwheat, Red Mountain | Q0S6 | P01 | CA; Mendocino County | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum kennedyi pinicola | Cache Peak buckwheat | Buckwheat, Cache Peak | Q0S8 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum kennedyi var. austromontanum | Southern mountain wild-buckwheat | Wild-buckwheat, southern mountain | Q0S7 | P01 | CA; U.S.A. (CA) | Polygonaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Eriogonum lagopus | No common name | No common name | Q0S9 | P01 | MT, WY; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum lancifolium | Lance leaf wild-buckwheat | Wild-buckwheat, lance leaf | Q29M | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum latens | No common name | No common name | Q0SA | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum lemmonii | [Unnamed] buckwheat | Buckwheat, [unnamed] | Q0SB | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum lewisii | No common name | No common name | Q33A | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum libertini | Dubakella Mountain buckwheat | Buckwheat, Dubakella Mountain | Q2OQ | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum lobbii robustum | No common name | No common name | Q2TH | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum loganum | Logan wild-buckwheat | Wild-buckwheat, Logan | Q0SC | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum lonchophyllum | Spreading wild-buckwheat | Wild-buckwheat, spreading | Q0SE | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum lonchophyllum | Divide wild-buckwheat | Wild-buckwheat, Divide | Q0S4 | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum lonchophyllum saurinum | Dinosaur wild-buckwheat | Wild-buckwheat, dinosaur | Q0SF | P01 | CO, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum longifolium harperi | No common name | No common name | Q0SD | P01 | AL, KY, TN; | Polygonaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eriogonum longifolium var. gnaphalifolium | Scrub buckwheat | Buckwheat, scrub | Q29N | P01 | FL; U.S.A. (FL); Xeric sandy ridges of central Florida | Polygonaceae | Apr 27, 1993 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Eriogonum meledonum | [Unnamed] buckwheat | Buckwheat, [unnamed] | Q3D1 | P01 | ID; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum microthecum johnstonii | Johnston's buckwheat | Buckwheat, Johnston's | Q0SG | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum microthecum panamintense | Panamint Mountains buckwheat | Buckwheat, Panamint Mountains | Q0SH | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum mortonianum | Fredonia wild-buckwheat | Wild-buckwheat, Fredonia | Q0SI | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Eriogonum nanum | Dwarf wild-buckwheat | Wild-buckwheat, dwarf | Q0SJ | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum natum | No common name | No common name | Q0SK | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum nealleyi | Irion County wild-buckwheat | Wild-buckwheat, Irion County | Q0SL | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum nervulosum | Snow Mountain buckwheat | Buckwheat, Snow Mountain | Q2TI | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum nortonii | Pinnacles buckwheat | Buckwheat, Pinnacles | Q0SM | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum novonudum | No common name | No common name | Q0SN | P01 | OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum nudum murinum | Mouse buckwheat | Buckwheat, mouse | Q0SO | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum nummulare | No common name | No common name | Q29O | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum ostlundii | Ostlund wild-buckwheat | Wild-buckwheat, Ostlund | Q0SP | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum ovalifolium caelestinum | No common name | No common name | Q0SQ | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum ovalifolium var. vineum | Cushenbury buckwheat | Buckwheat, cushenbury | Q1W8 | P01 | CA; U.S.A. (CA) | Polygonaceae | Aug 24, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriogonum ovalifolium var. williamsiae | Steamboat buckwheat | Buckwheat, steamboat | Q2OR | P01 | NV; U.S.A. (NV) | Polygonaceae | Jul 08, 1986 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriogonum panguicense alpestre | Panguitch wild-buckwheat | Wild-buckwheat, Panguitch | Q0SR | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum parvifolium lucidum | Point Lobos buckwheat | Buckwheat, Point Lobos | Q0SS | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum parvifolium paynei | Santa Paula buckwheat | Buckwheat, Santa Paula | Q0ST | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum pelinophilum | Clay-Loving wild buckwheat | wild buckwheat, clay-loving | Q29P | P01 | CO; U.S.A. (CO) | Polygonaceae | Jul 13, 1984 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Eriogonum pendulum | Waldo buckwheat | Buckwheat, Waldo | Q0SU | P01 | CA, OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Eriogonum polycladon | No common name | No common name | Q0RJ | P01 | AZ, NM; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum prociduum | Prostrate buckwheat | Buckwheat, prostrate | Q2OS | P01 | CA, NV, OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Eriogonum ripleyi | Ripley wild-buckwheat | Wild-buckwheat, Ripley | Q0SV | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum rubricaule | No common name | No common name | Q0SW | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum scopulorum | No common name | No common name | Q0SX | P01 | OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum siskiyouense | Siskiyou buckwheat | Buckwheat, Siskiyou | Q0SY | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum smithii | Smith wild-buckwheat | Wild-buckwheat, Smith | Q0SZ | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum soredium | Frisco buckwheat | Buckwheat, Frisco | Q2OT | P01 | UT; ; Eriogonum soredium is known from four distinct populations on private lands in the southern San Francisco Mountains in Beaver County, Utah—the Grampian Hill, Cupric Mine, Copper Gulch, and Indian Queen populations (Miller 2010g, p. 6; Roth 2010a, pp. 1–2). We are not aware of any additional populations. Surveys were conducted on BLM lands adjacent to the known populations in 2010, and no plants or habitat were found (Miller 2010g, Appendix B and p. 6; Roth 2010a, pp. 1–3); these adjacent areas do not contain Ordovician Limestone, the substrate that supports E. soredium (see Habitat section below) (Miller 2010g, p. 6). Similarly, no additional populations of either species were found during surveys of the San Francisco Mountains and surrounding ranges (including the Wah Wah Mountains, Crystal Peak, the Confusion Range, and the Mountain Home Range) (Kass 1992a, p. 5; Kass 1992b, p. 4; Evenden 1998, p. 5; Robinson 2004, p. 16; Miller 2010c, entire; Roth 2010a, pp. 2–3). There were reports of two populations of E. soredium in the Wah Wah Mountains; however, we do not believe these reports are accurate—one report appears to have incorrect location information (Kass 1992a, p. 5; Franklin 2005, p. 85) and the other report appears to be a species misidentification (Robinson 2004, p. 16; Roth 2010a, p. 3). Therefore, reports of these two populations are thought to be erroneous. | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum suffruticosum | Bushy wild-buckwheat | Wild-buckwheat, bushy | Q0T0 | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum temblorense | Temblor buckwheat | Buckwheat, Temblor | Q0T1 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| eriogonum terrenatum | san pedro river wild buckwheat | No common name | Q3LG | P01 | polygonaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Eriogonum thompsonae albiflorum | Thompson, white-flow wild-buckwheat | Wild-buckwheat, Thompson, white-flow | Q0T3 | P01 | AZ, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Eriogonum thompsonae atwoodii | Thompson, Atwood's wild-buckwheat | Wild-buckwheat, Thompson, Atwood's | Q0T2 | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum thompsonae thompsonae | Thompson wild-buckwheat | Wild-buckwheat, Thompson | Q0T4 | P01 | AZ, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Eriogonum thymoides | No common name | No common name | Q29Q | P01 | ID, OR, WA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum tiehmii | Tiehm's buckwheat | Buckwheat, Tiehm's | Q33B | P01 | NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum truncatum | Contra Costa buckwheat | Buckwheat, Contra Costa | Q0T5 | P01 | CA; Believed to be extinct | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum tumulosum | No common name | No common name | Q29R | P01 | CO, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum twisselmannii | Twisselmann's buckwheat | Buckwheat, Twisselmann's | Q0T6 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum umbellatum humistratum | Mt. Eddy buckwheat | Buckwheat, Mt. Eddy | Q2OU | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum umbellatum hypoleium | No common name | No common name | Q0T8 | P01 | WA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eriogonum umbellatum minus | Sulfur-flowered, alpine buckwheat | Buckwheat, sulfur-flowered, alpine | Q0T9 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum umbellatum torreyanum | Donner Pass buckwheat | Buckwheat, Donner Pass | Q0T7 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum vestitum | Idria buckwheat | Buckwheat, Idria | Q0TA | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum viridulum | No common name | No common name | Q0TB | P01 | CO, UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum viscidulum | [Unnamed] buckwheat | Buckwheat, [unnamed] | Q0TC | P01 | NV; | Polygonaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum visheri | No common name | No common name | Q2TJ | P01 | ND, SD; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Eriogonum wrightii olanchense | Olanche Peak buckwheat | Buckwheat, Olanche Peak | Q0TD | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriogonum zionis coccineum | Zion, coccineum wild-buckwheat | Wild-buckwheat, Zion, coccineum | Q0TE | P01 | AZ; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eriogonum zionis zionis | Zion, zionis wild-buckwheat | Wild-buckwheat, Zion, zionis | Q0TF | P01 | AZ, UT; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Eriophyllum congdonii | Congdon's wooly-sunflower | Wooly-sunflower, Congdon's | Q0TG | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriophyllum lanatum hallii | Ft. Tejon wooly-sunflower | Wooly-sunflower, Ft. Tejon | Q0TH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriophyllum latilobum | San Mateo woolly sunflower | Sunflower, San Mateo woolly | Q2TK | P01 | CA; U.S.A. (CA) | Asteraceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eriophyllum mohavense | Barstow wooly-sunflower | Wooly-sunflower, Barstow | Q0TI | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriophyllum nevinii | Nevin's wooly-sunflower | Wooly-sunflower, Nevin's | Q2TL | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eriophyllum nubigenum | Yosemite wooly-sunflower | Wooly-sunflower, Yosemite | Q0TJ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erithacus komadori subrufa | Southern Ryukyu robin | Robin, Southern Ryukyu | B0D5 | V01 | Muscicapidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Erithalis fruticosa | No common name | No common name | Q0TK | P01 | PR, VI; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| erodium macrophyllum | Large-leaved filaree | filaree, Large-leaved | Q3JN | P01 | geraniales | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Errazurizia rotundata | No common name | No common name | Q0TL | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eryngium aristulatum hooveri | Hoover's button-celery | Button-celery, Hoover's | Q2OV | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eryngium aristulatum var. parishii | San Diego button-celery | Button-celery, San Diego | Q1W9 | P01 | CA; U.S.A. (CA) | Apiaceae | Aug 03, 1993 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eryngium constancei | Loch Lomond coyote thistle | Thistle, Loch Lomond coyote | Q29S | P01 | CA; U.S.A. (CA) | Apiaceae | Aug 01, 1985 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Eryngium cuneifolium | Snakeroot | Snakeroot | Q29T | P01 | FL; U.S.A. (FL) | Apiaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Eryngium mathiasiae | Mathias' coyote-thistle | Coyote-thistle, Mathias' | Q29U | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eryngium pendletonensis | Pendleton button-clery | Button-clery, Pendleton | Q3IS | P01 | Apiaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Eryngium petiolatum | [Unnamed] coyote-thistle | Coyote-thistle, [unnamed] | Q0TM | P01 | OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eryngium pinnatisectum | Tuolumne coyote-thistle | Coyote-thistle, Tuolumne | Q0TN | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eryngium racemosum | Delta coyote-thistle | Coyote-thistle, Delta | Q0TO | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eryngium spinosepalum | Spinysepaled eryngo | eryngo, Spinysepaled | Q2TM | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erysimum ammophilum | Coast wallflower | Wallflower, coast | Q0TP | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erysimum asperum angustatum | [Unnamed] wallflower | Wallflower, [unnamed] | Q29V | P01 | AK; Canada (Yukon) | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Erysimum capitatum var. angustatum | Contra Costa wallflower | Wallflower, Contra Costa | Q1WA | P01 | CA; U.S.A. (CA) | Brassicaceae | May 27, 1978 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Erysimum franciscanum | San Francisco wallflower | Wallflower, San Francisco | Q0TQ | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erysimum insulare insulare | Island wallflower | Wallflower, island | Q0TR | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Erysimum menziesii | Menzies' wallflower | Wallflower, Menzies' | Q29W | P01 | CA; U.S.A. (CA) | Brassicaceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Erysimum teretifolium | Ben Lomond wallflower | Wallflower, Ben Lomond | Q29X | P01 | CA; U.S.A. (CA) | Brassicaceae | Feb 04, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Erythrina eggersii | Pinon espinoso or cockspur | Pinon espinoso or cockspur | Q33C | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Erythroecia hebardi | Hebard's noctuid moth | Noctuid moth, Hebard's | I0BK | I01 | DE, NJ, OH, VA; | Noctuidae | NA | Insects | 3 | Not Listed | 3, 5 | US | I | Wherever found |
| Erythronium citrinum rodrickii | Lemon colored fawn-lily | Fawn-lily, lemon colored | Q3D2 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erythronium cliftonii | No common name | No common name | Q29Y | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erythronium elegans | No common name | No common name | Q33D | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erythronium grandiflorum nudipetalum | No common name | No common name | Q3D3 | P01 | ID; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erythronium grandiflorum pusateri | Kaweah Lakes fawn-lily | Fawn-lily, Kaweah Lakes | Q0TS | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erythronium helenae | No common name | No common name | Q29Z | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erythronium howellii | Howell's fawn-lily | Fawn-lily, Howell's | Q2A0 | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Erythronium oregonum | No common name | No common name | Q0TT | P01 | OR, WA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Erythronium propullans | Minnesota dwarf trout lily | Lily, Minnesota dwarf trout | Q2A1 | P01 | MN; U.S.A. (MN) | Liliaceae | Mar 26, 1986 | Flowering Plants | 3 | Endangered | 3 | US | P | Wherever found |
| Erythronium tuolumnense | Tuolumne fawn-lily | Fawn-lily, Tuolumne | Q0TU | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Erythrura trichroa pelewensis | Palau blue-faced parrotfinch | Parrotfinch, Palau blue-faced | B06I | V01 | Caroline Islands | Estrildidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found |
| Eschrichtius robustus | Gray whale | Whale, gray | A02P | V01 | North Pacific Ocean-coastal and Bering Sea, formerly North Atlantic Ocean; Western North Pacific Ocean only | Eschrichtiidae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Western North Pacific DPS See 50 CFR 224.101 |
| Eschrichtius robustus | Gray whale | Whale, gray | A02P | V02 | Eschrichtiidae | Jun 16, 1994 | Mammals | NMFS | Recovery | NA | US/Foreign | V | Eastern North Pacific Ocean--coastal and Bering, Beaufort, and Chukchi Seas | |
| Eschscholzia multiflora twisselmannii | No common name | No common name | Q3D4 | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eschscholzia procera | Kernville poppy | Poppy, Kernville | Q0TV | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eschscholzia ramosa | Island poppy | Poppy, Island | Q0TW | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Eschscholzia rhombipetala | Diamond-petaled poppy | Poppy, diamond-petaled | Q2TN | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Escobaria albicolumnaria | White column cory cactus | Cory cactus, white column | Q0H7 | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| escobaria alversonii | Foxtail cactus | cactus, Foxtail | Q3JL | P01 | cactaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Escobaria guadalupensis | Guadalupe pincushion cactus | Pincushion cactus, Guadalupe | Q33E | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Escobaria hesteri | Hester's cory cactus | Cory cactus, Hester's | Q0HA | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Escobaria missouriensis var. marstonii | [Unnamed] cory cactus | Cory cactus, [unnamed] | Q27K | P01 | AZ, UT; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Escobaria villardii | Villard's pincushion cactus | Pincushion cactus, Villard's | Q3D5 | P01 | NM; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Escobaria vivipara rosea | Rose-flowered foxtail cactus | Foxtail cactus, rose-flowered | Q0HF | P01 | AZ, CA, NV, UT; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Escobaria vivipara var. buoflama | [Unnamed] cory cactus | Cory cactus, [unnamed] | Q27N | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Esenbeckia berlandieri | None | None | Q3IC | P01 | TX; Cameron Cnty, TX | Rutaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Etheostoma | Hiwassee darter | Darter, Hiwassee | E0AE | V01 | Percidae | NA | Fishes | 4 | Not Listed | NA | US | V | Wherever found | |
| Etheostoma | Yazoo darter | Darter, yazoo | E03O | V01 | MS; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma acuticeps | Sharphead darter | Darter, sharphead | E01A | V01 | NC; | Percidae | NA | Fishes | 5 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma akatulo | bluemask darter | darter, bluemask | E076 | V01 | TN; U.S.A. (TN) | Percidae | Dec 27, 1993 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma aquali | Coppercheek darter | Darter, coppercheek | E05Q | V01 | TN; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma bellator | Warrior darter | Darter, Warrior | E099 | V01 | AL; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma blenniodes guttseli | Tuckaseegee darter | Darter, Tuckaseegee | E0AD | V01 | Percidae | NA | Fishes | 4 | Not Listed | NA | US | V | Wherever found | |
| Etheostoma boschungi | Slackwater darter | Darter, slackwater | E01B | V01 | AL, TN; U.S.A. (TN, AL) | Percidae | Oct 11, 1977 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma brevirostrum | Holiday darter | Darter, holiday | E095 | V01 | AL, GA, TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma chermocki | Vermilion darter | Darter, vermilion | E098 | V01 | AL; U.S.A. (AL) | Percidae | Nov 28, 2001 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma chienense | Relict darter | Darter, relict | E086 | V01 | KY; Upper Bayou du Chien system in western Kentucky; U.S.A. (KY) | Percidae | Dec 27, 1993 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma chuckwachatte | lipstick darter | darter, lipstick | E0AQ | V01 | GA; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma cinereum | Ashy darter | Darter, ashy | E091 | V01 | AL, GA, KY, TN, VA; | Percidae | May 04, 2019 | Fishes | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Etheostoma collis | Carolina Darter | Darter, Carolina | E0B0 | V01 | Percidae | NA | Fishes | 4 | Not Listed | NA | US | V | Wherever found | |
| Etheostoma corona | Crown darter | Darter, crown | E093 | V01 | AL, TN; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma cragini | Arkansas darter | Darter, Arkansas | E06H | V01 | AR, CO, KS, MO, OK; | Percidae | NA | Fishes | 6 | Not Listed | 2, 3, 4, 6 | US | V | Wherever found |
| Etheostoma ditrema | Coldwater darter | Darter, coldwater | E013 | V01 | AL, GA, TN; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma douglasi | Tuskaloosa darter | Darter, Tuskaloosa | E097 | V01 | AL; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma etowahae | Etowah darter | Darter, Etowah | E089 | V01 | GA; U.S.A. (GA) | Percidae | Dec 20, 1994 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma fonticola | Fountain darter | Darter, fountain | E00T | V01 | TX; U.S.A. (TX) | Percidae | Oct 13, 1970 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Etheostoma forbesi | Barrens darter | Darter, Barrens | E092 | V01 | TN; | Percidae | May 04, 2019 | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma grahami | Rio Grande darter | Darter, Rio Grande | E03N | V01 | TX; | Percidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Etheostoma lepidum | Greenthroat darter | Darter, greenthroat | E03L | V01 | NM, TX; | Percidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Etheostoma maculatum | Spotted darter | Darter, spotted | E096 | V01 | NY; | Percidae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Etheostoma mariae | Pinewoods darter | Darter, pinewoods | E05T | V01 | NC, SC; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma maydeni | redlips darter | darter, redlips | E0DG | V01 | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | NA | US | V | Entire | |
| Etheostoma microlepidum | Smallscale darter | darter, Smallscale | E0CO | V01 | KY, TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma moorei | Yellowcheek Darter | Darter, yellowcheek | E01E | V01 | AR; U.S.A. (AR) | Percidae | Sep 08, 2011 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma nianguae | Niangua darter | Darter, Niangua | E02B | V01 | MO; U.S.A. (MO) | Percidae | Jun 12, 1985 | Fishes | 3 | Threatened | 3 | US | V | Wherever found |
| Etheostoma nuchale | Watercress darter | Darter, watercress | E00U | V01 | AL; U.S.A. (AL) | Percidae | Oct 13, 1970 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma okaloosae | Okaloosa darter | Darter, Okaloosa | E00H | V01 | FL; The Okaloosa darter is known only from six small basins (467 km2 total area) that drain into Boggy Bayou and Rocky Bayou of Choctawhatchee Bay: Toms, Turkey, Mill, Swift, East Turkey, and Rocky creeks; U.S.A. (FL) | Percidae | Jun 04, 1973 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma osburni | Candy darter | Darter, candy | E03K | V01 | VA, WV; | Percidae | Dec 21, 2018 | Fishes | 5 | Endangered | 5 | US | V | Wherever found |
| Etheostoma pallididorsum | Paleback darter | Darter, paleback | E019 | V01 | AR; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma percnurum | Duskytail darter | Darter, duskytail | E078 | V01 | KY, TN, VA; U.S.A. (VA, TN) | Percidae | Apr 27, 1993 | Fishes | 4 | Endangered | 4, 5 | US | V | Wherever found |
| Etheostoma percnurum | Duskytail darter | Darter, duskytail | E078 | V02 | TN; U.S.A. (VA, TN) | Percidae | Aug 12, 2002 | Fishes | 4 | Experimental Population, Non-Essential | 4 | US | V | The Tellico River, between the backwaters of the Tellico Reservoir (approximately Tellico River mile 19 (30.4 kilometers) and Tellico River mile 33 (52.8 kilometers), near the Tellico Ranger Station, Monroe County, Tennessee. |
| Etheostoma percnurum | Duskytail darter | Darter, duskytail | E078 | V03 | U.S.A. (VA, TN) | Percidae | Oct 15, 2007 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(q)(1)(ii)) |
| Etheostoma perlongum | Waccamaw darter | Darter, waccamaw | E01D | V01 | NC; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma phytophilum | Rush Darter | Darter, rush | E0AB | V01 | AL; U.S.A. (AL) | Percidae | Sep 08, 2011 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma pseudovulatum | Egg-mimic darter | Darter, egg-mimic | E094 | V01 | TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma rubrum | Bayou darter | Darter, bayou | E01S | V01 | MS; U.S.A. (MS) | Percidae | Oct 28, 1975 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma rupestre | Rock darter | Darter, rock | E07B | V01 | AL, GA, MS; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Etheostoma sagitta | Cumberland arrow darter | Darter, Cumberland arrow | E0BT | V01 | KY, TN, VA; | Percidae | NA | Fishes | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Etheostoma scotti | Cherokee darter | Darter, Cherokee | E03J | V01 | GA; U.S.A. (GA) | Percidae | Dec 20, 1994 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma sellare | Maryland darter | Darter, Maryland | E003 | V01 | MD; Possibly extinct; U.S.A. (MD) | Percidae | Mar 11, 1967 | Fishes | 5 | Endangered | 5 | US | V | Wherever found |
| Etheostoma spilotum | Kentucky arrow darter | Darter, Kentucky arrow | E0BF | V01 | KY; U.S.A. (KY) | Percidae | Nov 04, 2016 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma striatulum | Striated darter | Darter, striated | E06J | V01 | TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma susanae | Cumberland darter | Darter, Cumberland | E05R | V01 | KY, TN; U.S.A. (TN, KY) | Percidae | Sep 08, 2011 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma tecumsehi | Shawnee darter | darter, Shawnee | E0CP | V01 | KY; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma tippecanoe | Tippecanoe darter | darter, Tippecanoe | E0CQ | V01 | IN, KY, OH, PA, TN, WV; | Percidae | NA | Fishes | 5 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Etheostoma trisella | Trispot darter | Darter, trispot | E05G | V01 | AL, GA, TN; | Percidae | Jan 28, 2019 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Etheostoma tuscumbia | Tuscumbia darter | Darter, Tuscumbia | E01C | V01 | AL, TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Etheostoma wapiti | Boulder darter | Darter, boulder | E05P | V01 | AL, TN; U.S.A. (TN, AL) | Percidae | Sep 01, 1988 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Etheostoma wapiti | Boulder darter | Darter, boulder | E05P | V02 | TN; U.S.A. (TN, AL) | Percidae | Sep 01, 1988 | Fishes | 4 | Experimental Population, Non-Essential | 4 | US | V | Shoal Creek (from Shoal Creek mile 41.7 (66.7 km)) at the mouth of Long Branch, Lawrence County, TN, downstream to the backwaters of Wilson Reservoir (Shoal Creek mile 14 (22 km)) at Goose Shoals, Lauderdale County, AL, including the lower 5 miles (8 km) of all tributaries that enter this reach. |
| Etheostoma zonistium | bandfin darter | darter, bandfin | E0AS | V01 | Percidae | NA | Fishes | 4 | Not Listed | NA | US | V | Wherever found | |
| Ethmia monachella | Lost ethmiid moth | Ethmiid moth, lost | I0L0 | I01 | CO; | Ethmiidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Eua zebrina | Snail [no common name] | [no common name] Snail | G0BJ | I01 | AS; | Partulidae | Oct 24, 2016 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Eubalaena australis | Southern Right Whale | Whale, Southern Right | A0K7 | V01 | Oceanic | Balaenidae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Wherever found |
| Eubalaena glacialis | North Atlantic Right Whale | Whale, North Atlantic Right | A02R | V01 | GA; Oceanic | Balaenidae | Jun 02, 1970 | Mammals | NMFS | Endangered | 4 | US/Foreign | V | Wherever found |
| Eubalaena japonica | North Pacific Right Whale | Whale, North Pacific Right | A0K6 | V01 | Oceanic | Balaenidae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | US/Foreign | V | Wherever found |
| Eucephalus glaucescens | [Unnamed] aster | Aster, [unnamed] | Q04N | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eucephalus gormanii | Gorman aster | Aster, Gorman | Q04O | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eucephalus tomentellus | Brikellbush aster | Aster, brikellbush | Q04K | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Eucephalus vialis | Wayside aster | Aster, wayside | Q050 | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eucerceris ruficeps | Redheaded sphecid wasp | Sphecid wasp, redheaded | I0E5 | I01 | CA, NV; | Sphecidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euchemotrema cheatumi | Palmetto pillsnail | Pillsnail, palmetto | G02P | I01 | TX; | Polygyridae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Euchemotrema hubrichti | Carinate pillsnail | Pillsnail, carinate | G02O | I01 | IL; | Polygyridae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Euchlaena milnei | [Unnamed] looper moth | Looper moth, [unnamed] | I0NC | I01 | IL, NC, OH, VA, WI, WV; | Geometridae | NA | Insects | 5 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Euchloe ausonides insulanus | Island marble Butterfly | Butterfly, Island marble | I0T7 | I01 | WA; | Pieridae | NA | Insects | 1 | Proposed Endangered | 1 | US | I | Wherever found |
| Euchloe hyantis andrewsi | Andrew's marble butterfly | Butterfly, Andrew's marble | I004 | I01 | CA; | Pieridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Eucosma hennei | Henne's eucosman moth | Moth, Henne's eucosman | I0AU | I01 | CA; | Olethreutidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Eucyclogobius newberryi | Tidewater goby | Goby, tidewater | E071 | V01 | CA, OR; U.S.A. (CA) | Gobiidae | Feb 04, 1994 | Fishes | 8 | Endangered | 1, 8 | US | V | Wherever found |
| Euderma maculatum | Spotted bat | Bat, spotted | A08A | V01 | AZ, CA, CO, ID, MT, NM, NV, OR, TX, UT, WY; | Vespertilionidae | NA | Mammals | 2 | Not Listed | 1, 2, 6, 8 | US/Foreign | V | Wherever found |
| Eudyptes chrysocome | southern rockhopper penguin | penguin, southern rockhopper | B0FC | V01 | New Zealand-Australia DPS, associated with the Campbell Plateau and Macquarie Island | Spheniscidae | Mar 24, 2011 | Birds | Foreign | Threatened | NA | Foreign | V | New Zealand-Australia DPS, associated with the Campbell Plateau and Macquarie Island |
| Eudyptes chrysocome filholi | eastern rockhopper penguin | penguin, eastern rockhopper | B0FD | V01 | Spheniscidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Eudyptes chrysolophus | macaroni penguin | penguin, macaroni | B0FI | V02 | Spheniscidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Campbell Plateau portion of New Zealand/Australia population | |
| Eudyptes moseleyi | northern rockhopper penguin | penguin, northern rockhopper | B0FE | V01 | Spheniscidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Eudyptes pachyrhynchus | fiordland crested penguin | penguin, fiordland crested | B0FF | V01 | New Zealand, South Island and offshore Islands | Spheniscidae | Sep 02, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Eudyptes robustus | snares crested penguin | penguin, snares crested | B0FG | V01 | Spheniscidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Eudyptes schlegeli | royal penguin | penguin, royal | B0FJ | V01 | Spheniscidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Eudyptes sclateri | erect-crested penguin | penguin, erect-crested | B0FH | V01 | New Zealand, Bounty Islands and Antipodes Islands | Spheniscidae | Sep 02, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Eudyptula albosignata | white-flippered penguin | penguin, white-flippered | B0FK | V01 | New Zeland, South Island | Spheniscidae | Sep 02, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Eugenia bellonis | No common name | No common name | Q3D6 | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eugenia bryanii | No common name | No common name | Q3OW | P01 | GU; | Myrtaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Eugenia haematocarpa | Uvillo | Uvillo | Q2A2 | P01 | PR; U.S.A. (PR) | Myrtaceae | Nov 25, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Eugenia koolauensis | Nioi | Nioi | Q33F | P01 | HI; U.S.A. (HI) | Myrtaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Eugenia margarettae | No common name | No common name | Q0TX | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eugenia underwoodii | No common name | No common name | Q0TY | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eugenia woodburyana | No common name | No common name | Q3D7 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Myrtaceae | Sep 09, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| euhyparpax rosea | No common name | No common name | I0US | I01 | notodontidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Eulidia yarrellii | Chilean woodstar | Woodstar, Chilean | B0CY | V01 | Chile, Peru | Trochilidae | Sep 16, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Eulimnadia agassizii | Faxon's clam shrimp | Clam shrimp, Faxon's | K04A | I01 | MA; | Limnadiidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Eulimnadia stoningtonensis | Connecticut clam shrimp | Clam shrimp, Connecticut | K04B | I01 | CT; | Limnadiidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Eulonchus marialiciae | Mary Alice's smallheaded fly | Smallheaded fly, Mary Alice's | I0DT | I01 | NC; | Acroceridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Eumaeus atala florida | Florida atala butterfly | Butterfly, Florida atala | I000 | I01 | FL; | Lycaenidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Eumeces egregius lividus | Bluetail mole skink | Skink, bluetail mole | C03T | V01 | FL; U.S.A. (FL) | Scincidae | Nov 06, 1987 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Eumeces gilberti arizonensis | Arizona Gilbert's skink | Skink, Arizona Gilbert's | C03S | V01 | AZ; | Scincidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| eumeces gilberti ssp. rubricaudatus | Western red-tailed skink | skink, Western red-tailed | C06N | V01 | scincidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Eumeces skiltonianus interparietalis | Coronado skink | Skink, Coronado | C05D | V01 | CA; | Scincidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Eumetopias jubatus | Steller sea lion | Sea lion, Steller | A0FS | V01 | CA, OR, WA; Canada (B.C.); U.S.A. (WA,OR,CA,AK), Canada, Russia, North Pacific Ocean | Otariidae | Apr 05, 1990 | Mammals | NMFS | Recovery | 1, 8 | US/Foreign | V | Eastern DPS - Entire, except the population segment west of 1440 W. Long |
| Eumetopias jubatus | Steller sea lion | Sea lion, Steller | A0FS | V02 | AK; U.S.A. (WA,OR,CA,AK), Canada, Russia, North Pacific Ocean | Otariidae | Apr 10, 1990 | Mammals | NMFS | Endangered | 7 | US/Foreign | V | Western DPS - See 50 CFR 224.101 |
| Eumops floridanus | Florida bonneted bat | bat, Florida bonneted | A0JB | V01 | FL; Includes all of Charlotte, Collier, Glades, Highlands, Lee, and Miami-Dade Counties, and portions of Broward, De Soto, Hardee, Hendry, Okeechobee, Osceola, Palm Beach, Polk, Sarasota, and Monroe Counties. | Molossidae | Nov 01, 2013 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Eumops glaucinus floridanus | Florida mastiff-bat | Mastiff-bat, Florida | A0BC | V01 | FL; | Molossidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Eumops perotis californicus | Greater western mastiff-bat | Mastiff-bat, greater western | A0BD | V01 | AZ, CA, NM, TX; | Molossidae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Eumops underwoodi | Underwood's mastiff-bat | Mastiff-bat, Underwood's | A08V | V01 | AZ; Mexico,Central America | Molossidae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Eumorsea pinaleno | Pinaleno monkey grasshopper | Grasshopper, Pinaleno monkey | I07A | I01 | AZ; | Eumastacidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Eunymphicus uveaensis | Uvea parakeet | Parakeet, Uvea | B0CV | V01 | Psittacidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Euparagia | Vespid | Vespid | I0TL | I01 | Vespidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Eupatorium altissimum | No common name | No common name | Q2A3 | P01 | NC, VA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Eupatorium leucolepis novae-angliae | White-bracted, New England thoroughwort | Thoroughwort, white-bracted, New England | Q0U1 | P01 | MA, RI; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Eupatorium paludicola | Swamp justiceweed | justiceweed, Swamp | Q3PA | P01 | NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Eupatorium resinosum | Pine barrens boneset | Boneset, pine barrens | Q2OW | P01 | DE, NC, NJ, NY, SC; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Eupatorium resinosum kentuckiense | [Unnamed] thoroughwort | Thoroughwort, [unnamed] | Q0U3 | P01 | KY; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eupelmus nihoaensis | Nihoa eupelmus wasp | Wasp, Nihoa eupelmus | I0F4 | I01 | HI; | Eupelmidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Euphilotes ancilla cryptica | Spring Mountains dark blue butterfly | butterfly, Spring Mountains dark blue | I0WB | I01 | NV; | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes ancilla purpura | Spring Mountains dark blue butterfly | butterfly, Spring Mountains dark blue | I0WA | I01 | NV; | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes anicia morandi | Morand's checkerspot butterfly | Butterfly, Morand's checkerspot | I0WD | I01 | Lycaenidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Euphilotes battoides allyni | El Segundo blue butterfly | Butterfly, El Segundo blue | I00C | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Euphilotes battoides comstocki | Comstock's blue butterfly | Butterfly, Comstock's blue | I032 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes bernardino minuta | Baking Powder Flat blue | Blue, Baking Powder Flat | I0IM | I01 | NV; U.S.A. (NV) | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes enoptes langstoni | Langston's blue butterfly | Butterfly, Langston's blue | I035 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes enoptes smithi | Smith's blue butterfly | Butterfly, Smith's blue | I00R | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Euphilotes enoptes ssp. | Dark blue | Blue, dark | I0MS | I01 | NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes pallescens arenamontana | Sand Mountain blue butterfly | Butterfly, Sand Mountain blue | I0TW | I01 | Lycaenidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Euphilotes pallescens mattonii | Mattoni''s blue | Blue, Mattoni''s | I0VN | I01 | CA, NV; U.S.A. (CA, NV) | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes rita mattoni | Mattoni's blue | Blue, Mattoni's | I02M | I01 | NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphilotes rita ssp. | Sand Mountain blue | Blue, Sand Mountain | I0MT | I01 | NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphorbia austrina | No common name | No common name | Q0U5 | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Euphorbia celastroides halawana | No common name | No common name | Q1WB | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides haupuana | No common name | No common name | Q1WC | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides humbertii | No common name | No common name | Q1WD | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides kohalana | No common name | No common name | Q0U6 | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides nelsonii | No common name | No common name | Q0U7 | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides nematopoda | No common name | No common name | Q0U8 | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides saxicola | No common name | No common name | Q0U9 | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia celastroides var. kaenana | `Akoko | `Akoko | Q1U7 | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia celastroides waikoluensis | No common name | No common name | Q1WE | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia degeneri molokaiensis | No common name | No common name | Q0UA | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Euphorbia deppeana | `Akoko | `Akoko | Q1U8 | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia discoidalis | No common name | No common name | Q0UB | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Euphorbia eleanoriae | `Akoko | `Akoko | Q3HH | P01 | HI; U.S.A. (HI) | Euphorbiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia exserta | No common name | No common name | Q0UC | P01 | FL, GA, NC; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Euphorbia haeleeleana | `Akoko | `Akoko | Q0UD | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia halemanui | ''Akoko | ''Akoko | Q1UA | P01 | HI; U.S.A. (HI) | Euphorbiaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia herbstii | `Akoko | `Akoko | Q3GN | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia innocua | No common name | No common name | Q2A4 | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Euphorbia kuwaleana | `Akoko | `Akoko | Q30T | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia macropus | No common name | No common name | Q33G | P01 | AZ; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| euphorbia misera | Cliff spurge | spurge, Cliff | Q3JO | P01 | CA; | euphorbiaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Euphorbia nephradenia | Paria spurge | Spurge, Paria | Q0UF | P01 | UT; | Euphorbiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Euphorbia purpurea | Darlington's spurge | Spurge, Darlington's | Q2OX | P01 | NC; | Euphorbiaceae | NA | Flowering Plants | 5 | Not Listed | 4 | US | P | Wherever found |
| Euphorbia remyi var. kauaiensis | `Akoko | `Akoko | Q1UC | P01 | HI; U.S.A. (HI) | Euphorbiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia remyi var. remyi | `Akoko | `Akoko | Q1UD | P01 | HI; U.S.A. (HI) | Euphorbiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia rockii | `Akoko | `Akoko | Q3GO | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia roemeriana | No common name | No common name | Q0UG | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Euphorbia rosescens | Rosy-pink spurge | Spurge, Rosy-pink | Q3IN | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Euphorbia skottsbergii var. skottsbergii | Ewa Plains `akoko | `Akoko, Ewa Plains | Q1UE | P01 | HI; U.S.A. (HI) | Euphorbiaceae | Aug 24, 1982 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Euphorbia strictior | No common name | No common name | Q0UH | P01 | NM, TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Euphorbia telephioides | Telephus spurge | Spurge, telephus | Q2A5 | P01 | FL; U.S.A. (FL) | Euphorbiaceae | May 08, 1992 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Euphydryas anicia cloudcrofti | Sacramento Mountains checkerspot Butterfly | Butterfly, Sacramento Mountains checkerspot | I0RK | I01 | NM; | Nymphalidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Euphydryas anicia morandi | Morand's checkerspot | Checkerspot, Morand's | I0KS | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphydryas editha bayensis | Bay checkerspot butterfly | Butterfly, bay checkerspot | I021 | I01 | CA; U.S.A. (CA) | Nymphalidae | Sep 18, 1987 | Insects | 8 | Threatened | 8 | US | I | Wherever found |
| Euphydryas editha monoensis | Mono checkerspot | Checkerspot, mono | I00U | I01 | CA, NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Euphydryas editha quino (=E. e. wrighti) | Quino checkerspot butterfly | Butterfly, Quino checkerspot | I00P | I01 | CA; U.S.A. (CA), Mexico | Nymphalidae | Jan 16, 1997 | Insects | 8 | Endangered | 8 | US/Foreign | I | Wherever found |
| Euphydryas editha taylori | Taylor's (=whulge) Checkerspot | Checkerspot, Taylor's (=whulge) | I0T6 | I01 | OR, WA; | Nymphalidae | Nov 04, 2013 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Euphyes bayensis | Bay skipper | Skipper, Bay | I0ND | I01 | MS, TX; | Hesperiidae | NA | Insects | 4 | Not Listed | 2, 4 | US | I | Wherever found |
| Euphyes dukesi calhouni | Dukes' skipper | skipper, Dukes' | I0WM | I01 | FL; | Hesperiidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Euphyes pilatka klotsi | Palatka skipper | skipper, Palatka | I0WN | I01 | FL; | Hesperiidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Euphyes vestris harbisoni | Dun skipper | Skipper, dun | I0LV | I01 | CA; | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Euphyllia paradivisa | No common name | No common name | P00F | I01 | Caryophylliidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Euploea eleutho | Marianas euploea butterfly | Butterfly, Marianas euploea | I0QU | I01 | MP; | Danaidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Euproserpinus euterpe | Kern primrose sphinx moth | Moth, Kern primrose sphinx | I01C | I01 | CA; U.S.A. (CA) | Sphingidae | Apr 08, 1980 | Insects | 8 | Threatened | 8 | US | I | Wherever found |
| Euproserpinus wiesti | Weist's sphinx moth | Sphinx moth, Weist's | I022 | I01 | AZ, CO, MT, NM, TX; | Sphingidae | NA | Insects | 6 | Not Listed | 2, 6 | US | I | Wherever found |
| Eurema dina helios | Helios yellow butterfly | Butterfly, helios yellow | I033 | I01 | PR, VI; Caribbean | Pieridae | NA | Insects | 4 | Not Listed | 4 | US/Foreign | I | Wherever found |
| Eurhychium pringlei | No common name | No common name | Q33H | P01 | NC, SC; | Brachtheciaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Eurya sandwicensis | No common name | No common name | Q1WF | P01 | HI; | Theaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Eurybia avita | Alexander's rock-aster | Rock-aster, Alexander's | Q25N | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eurybia eryngiifolia | Coyote-thistle aster | Aster, coyote-thistle | Q2Z4 | P01 | AL, FL, GA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eurybia furcata | [Unnamed] aster | Aster, [unnamed] | Q25P | P01 | AR, IA, IL, IN, MO, WI; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Eurybia hemispherica | [Unnamed] aster | Aster, [unnamed] | Q04Z | P01 | MS; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eurybia mirabilis | Piedmont Aster | Aster, Piedmont | Q3KR | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eurybia saxicastellii | Rockcastle aster | Aster, Rockcastle | Q3B3 | P01 | KY, TN; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Eurybia schreberi | [Unnamed] aster | Aster, [unnamed] | Q2XM | P01 | IL; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Eurybia spinulosa | [Unnamed] aster | Aster, [unnamed] | Q04Y | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Eurycea aquatica | Dark-sided salamander | Salamander, dark-sided | D01X | V01 | AL, TN; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Eurycea chamberlaini | Chamberlain's Dwarf salamander | salamander, Chamberlain's Dwarf | D04P | V01 | FL, GA, NC, SC; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Eurycea chisholmensis | Salado Salamander | Salamander, Salado | D02X | V01 | TX; | Plethodontidae | Mar 26, 2014 | Amphibians | 2 | Threatened | 2 | US | V | Wherever found |
| Eurycea junaluska | Junaluska salamander | Salamander, Junaluska | D018 | V01 | NC; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Eurycea latitans | Cascade Caverns salamander | Salamander, Cascade Caverns | D012 | V01 | TX; | Plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Eurycea nana | San Marcos salamander | Salamander, San Marcos | D00I | V01 | TX; U.S.A. (TX) | Plethodontidae | Jul 14, 1980 | Amphibians | 2 | Threatened | 2 | US | V | Wherever found |
| Eurycea naufragia | Georgetown Salamander | Salamander, Georgetown | D02S | V01 | TX; | Plethodontidae | Mar 26, 2014 | Amphibians | 2 | Threatened | 2 | US | V | Wherever found |
| Eurycea neotenes | Texas salamander | Salamander, Texas | D01K | V01 | TX; | Plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Eurycea robusta | Robust blind salamander | Salamander, robust blind | D01E | V01 | TX; | Plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Eurycea sosorum | Barton Springs salamander | Salamander, Barton Springs | D010 | V01 | TX; U.S.A. (TX) | Plethodontidae | Apr 30, 1997 | Amphibians | 2 | Endangered | 2 | US | V | Wherever found |
| eurycea species | dolan falls salamander | salamander, dolan falls | D03Y | V01 | plethodontidae | NA | Amphibians | 2 | Not Listed | NA | US | V | Wherever found | |
| eurycea species | pedernales river springs salamander | salamander, pedernales river springs | D03X | V01 | plethodontidae | NA | Amphibians | 2 | Not Listed | NA | US | V | Wherever found | |
| eurycea species | comal springs salamander | salamander, comal springs | D03Z | V01 | plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| eurycea specieseight | No common name | No common name | D041 | V01 | plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| eurycea speciesten | Dolan Falls salamander | salamander, Dolan Falls | D040 | V01 | plethodontidae | NA | Amphibians | 2 | Not Listed | NA | US | V | Wherever found | |
| Eurycea tonkawae | Jollyville Plateau Salamander | Salamander, Jollyville Plateau | D02T | V01 | TX; | Plethodontidae | Sep 19, 2013 | Amphibians | 2 | Threatened | 2 | US | V | Wherever found |
| Eurycea tridentifera | Comal blind salamander | Salamander, Comal blind | D00G | V01 | TX; | Plethodontidae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Eurycea troglodytes | Valdina Farms salamander | Salamander, Valdina Farms | D00K | V01 | TX; | Plethodontidae | NA | Amphibians | 2 | Not Listed | 2 | US | V | Wherever found |
| Eurycea tynerensis | Oklahoma salamander | Salamander, Oklahoma | D01C | V01 | AR, MO, OK; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 2, 3, 4 | US | V | Wherever found |
| Eurycea waterlooensis | Austin blind Salamander | Salamander, Austin blind | D033 | V01 | TX; | Plethodontidae | Sep 19, 2013 | Amphibians | 2 | Endangered | 2 | US | V | Wherever found |
| Eurytaenia hinckleyi | No common name | No common name | Q0UI | P01 | TX; | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Eurytides iphitas | Swallowtail butterfly | Butterfly, swallowtail | I0SD | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Eurytides lysithous harrisianus | Harris' mimic swallowtail butterfly | Butterfly, Harris' mimic swallowtail | I0RS | I01 | Coastal Rio de Janeiro | Papilionidae | NA | Insects | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found |
| Eurytides marcellus | Jamaican kite swallowtail butterfly | Butterfly, Jamaican kite swallowtail | I0RT | I01 | Papilionidae | NA | Insects | Foreign | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Eutamias quadrivittatus australis | Organ Mountains Colorado chipmunk | Chipmunk, Organ Mountains Colorado | A0AL | V01 | NM; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Eutamias umbrinus nevadensis | Hidden Forest Uinta chipmunk | Chipmunk, Hidden Forest Uinta | A0AK | V01 | NV; | Sciuridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Eutrema penlandii | Penland alpine fen mustard | Mustard, Penland alpine fen | Q1WG | P01 | CO; U.S.A. (CO) | Brassicaceae | Jul 28, 1993 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Eutrichomyias rowleyi | Caerulean Paradise flycatcher | Flycatcher, Caerulean Paradise | B0B9 | V01 | Indonesia | Tyrannidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Eutriorchis astur | Madagascar serpent eagle | Eagle, Madagascar serpent | B09M | V01 | Madagascar | Accipitridae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Eximacris phenax | Big Cedar grasshopper | Grasshopper, Big Cedar | I0L1 | I01 | OK; Possibly extinct,not reported since 1965 | Acrididae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Eximacris superbum | Superb grasshopper | Grasshopper, superb | I07B | I01 | TX; Possibly extinct,not reported since 1965 | Acrididae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Exocarpos gaudichaudii | No common name | No common name | Q2TP | P01 | HI; | Santalaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Exocarpos luteolus | Heau | Heau | Q2A6 | P01 | HI; U.S.A. (HI) | Santalaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Exocarpos menziesii | Heau | Heau | Q3OJ | P01 | HI; ; Exocarpos menziesii is historically known from the islands of Lanai (Kaiholena Gulch) and Hawaii (from Kahuku Ranch in the south up through Hualalai and Puukapele on the leeward slopes) (Wagner et al. 1999, p. 1218). Currently, there is one scattered occurrence of Exocarpos menziesii on the slopes of Hualalai, on the southern leeward side of Hawaii Island (Thomas 2012, in litt.; PEPP 2013, pp. 10, 33). There are no known occurrences of the species on Lanai. | Santalaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Entire |
| Falco araea | Seychelles kestrel | Kestrel, Seychelles | B01Y | V01 | Indian Ocean-Seychelles Islands | Falconidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| falco columbarius | Merlin | Merlin | B0EQ | V01 | falconidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Falco femoralis septentrionalis | Northern Aplomado Falcon | Falcon, Northern Aplomado | B06V | V01 | TX; U.S.A. (TX, NM, AZ), Mexico, Guatemala | Falconidae | Feb 25, 1986 | Birds | 2 | Endangered | 2 | US/Foreign | V | Wherever found, except where listed as an experimental population |
| Falco femoralis septentrionalis | Northern Aplomado Falcon | Falcon, Northern Aplomado | B06V | V06 | AZ, NM; U.S.A. (AZ, NM) | Falconidae | Jul 26, 2006 | Birds | 2 | Experimental Population, Non-Essential | 2 | US/Foreign | V | U.S.A (AZ, NM) |
| Falco mexicanus | Prairie Falcon | Falcon, Prairie | B0ER | V01 | Falconidae | NA | Birds | 2 | Not Listed | NA | US | V | Wherever found | |
| Falco peregrinus | Peregrine Falcon | Falcon, Peregrine | B0FU | V01 | Falconidae | NA | Birds | 8 | Not Listed | NA | US | V | Wherever found | |
| Falco peregrinus anatum | American peregrine falcon | Falcon, American peregrine | B01H | V01 | AZ, CO, OK; entire hemisphere | Falconidae | Jun 02, 1970 | Birds | 8 | Recovery | 2, 6 | US/Foreign | V | Wherever found |
| Falco peregrinus peregrinus | Eurasian peregrine falcon | Falcon, Eurasian peregrine | B050 | V01 | Europe, Eurasia south to Africa and Mideast | Falconidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Falco peregrinus tundrius | Arctic peregrine Falcon | Falcon, Arctic peregrine | B047 | V01 | FL; entire hemisphere | Falconidae | Jun 02, 1970 | Birds | 7 | Recovery | 4 | US/Foreign | V | Wherever found |
| Falco punctatus | Mauritius kestrel | Kestrel, Mauritius | B01X | V01 | Indian Ocean-Mauritius | Falconidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Falco sparverius paulus | Southeastern American kestrel | Kestrel, southeastern American | B072 | V01 | FL; | Falconidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Fallceon eatoni | Mayfly | Mayfly | I0VT | I01 | AZ; | Baetidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Fallicambarus burrisi | Burrowing bog crayfish | Crayfish, Burrowing bog | K03Z | I01 | AL, MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Fallicambarus danielae | Speckled burrowing crayfish | Crayfish, Speckled burrowing | K040 | I01 | AL, MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Fallicambarus gilpini | Jefferson County crayfish | Crayfish, Jefferson County | K041 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Fallicambarus gordoni | Camp Shelby burrowing crayfish | Crayfish, Camp Shelby burrowing | K03N | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Fallicambarus harpi | Ouachita burrowing crayfish | Crayfish, Ouachita burrowing | K042 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Fallicambarus hortoni | Hatchie Burrowing crayfish | crayfish, Hatchie Burrowing | K06S | I01 | TN; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Fallicambarus jeanae | [Unnamed] crayfish | Crayfish, [unnamed] | K032 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Fallicambarus petilicarpus | Slenderwrist burrowing crayfish | Crayfish, Slenderwrist burrowing | K043 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Fallicambarus strawni | Saline Burrowing crayfish | crayfish, Saline Burrowing | K06T | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Farancia erytrogramma seminola | South Florida rainbow snake | Snake, south Florida rainbow | C078 | V01 | FL; | Colubridae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Farula davisi | Green Springs Mountain farulan caddisfly | Caddisfly, Green Springs Mountain farulan | I03T | I01 | OR; Possibly extinct,not reported since 1965 | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Farula jewetti | Mt. Hood farulan caddisfly | Caddisfly, Mt. Hood farulan | I043 | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Farula reapiri | Tombstone Prairie farulan caddisfly | Caddisfly, Tombstone Prairie farulan | I04E | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Farula sp. | Long-tailed caddisfly | Caddisfly, long-tailed | I0IZ | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Faxonius eupunctus | Coldwater crayfish | crayfish, Coldwater | K06Y | I01 | AR, MO; | Cambaridae | May 04, 2019 | Crustaceans | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Faxonius peruncus | Big Creek Crayfish | Crayfish, Big Creek | K090 | I01 | MO; | Cambaridae | NA | Crustaceans | 3 | Under Review in the Candidate or Petition Process | 3 | US | I | Entire |
| Faxonius quadruncus | St. Francis River Crayfish | Crayfish, St. Francis River | K091 | I01 | MO; | Cambaridae | NA | Crustaceans | 3 | Under Review in the Candidate or Petition Process | 3 | US | I | Entire |
| Faxonius roberti | Spring River crayfish | crayfish, Spring River | K092 | I01 | Cambaridae | May 04, 2019 | Crustaceans | 3 | Not Listed | NA | US | I | Entire | |
| Faxonius wagneri | Eleven Point River crayfish | crayfish, Eleven Point River | K093 | I01 | Cambaridae | May 04, 2019 | Crustaceans | 3 | Not Listed | NA | US | I | Entire | |
| Felis concolor browni | Yuma puma | Puma, Yuma | A0DL | V01 | AZ, CA; | Felidae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Felis concolor californica | California mountain lion | Mountain lion, California | A0HV | V01 | CA, NV, OR; Southern Oregon, Western Nevada, Northern Baja California, Mexico | Felidae | NA | Mammals | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Felis concolor schorgeri | Wisconsin puma | Puma, Wisconsin | A0DK | V01 | IA, IL, KS, MN, MO, WI; | Felidae | NA | Mammals | 3 | Not Listed | 3, 6 | US/Foreign | V | Wherever found |
| Felis jacobita | Andean cat | Cat, Andean | A04V | V01 | Entire | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Felis margarita scheffeli | Pakistan sand cat | Cat, Pakistan sand | A0A0 | V01 | Pakistan (Changai) | Felidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Felis nigripes | Black-footed cat | Cat, black-footed | A04W | V01 | Entire | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Felis pardina | Spanish lynx | Lynx, Spanish | A01M | V01 | Spain,Portugal | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ferocactus acanthodes acanthodes | Viznaga | Viznaga | Q2A7 | P01 | AZ, CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Ferocactus eastwoodiae | No common name | No common name | Q0UJ | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ferocactus viridescens | Coast barrel cactus | Barrel cactus, coast | Q0UK | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Ferrissia mcneili | Hood ancylid | Ancylid, hood | G05S | I01 | AL, FL; | Ancylidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Festuca dasyclada | Sedge fescue | Fescue, sedge | Q0UL | P01 | CO, UT; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Festuca hallii | No common name | No common name | Q2OY | P01 | CO; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Festuca hawaiiensis | No common name | No common name | Q33I | P01 | HI; | Poaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Festuca ligulata | Guadalupe fescue | Fescue, Guadalupe | Q0UM | P01 | TX; | Poaceae | Oct 10, 2017 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Festuca molokaiensis | No common name | No common name | Q3O5 | P01 | HI; | Poaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Filipendula occidentalis | Queen-of-the-forest | Queen-of-the-forest | Q0UN | P01 | OR, WA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Fimbristylis hawaiiensis | No common name | No common name | Q33J | P01 | HI; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Fimbristylis perpusilla | Harper's fimbristylis | Fimbristylis, Harper's | Q0UO | P01 | GA, SC, VA; | Cyperaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | P | Wherever found |
| Fimbristylis thermalis | Hot springs fimbristylis | Fimbristylis, hot springs | Q2A8 | P01 | CA, NV; Tropical America | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fisherola nuttalli | Shortface lanx | Lanx, shortface | G024 | I01 | ID, OR, WA; | Lymnaeidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Fissidens appalachensis | Appalachian Fissidens moss | moss, Appalachian Fissidens | S02T | P01 | NC, TN; | Fissidentaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Entire |
| Fissidens hallii | Hall's Pocket moss | moss, Hall's Pocket | S02U | P01 | FL, LA, NC, TX; | Fissidentaceae | NA | Ferns and Allies | 4 | Not Listed | 2, 4 | US | P | Entire |
| Fitzroya cupressoides | Chilean false larch | Larch, Chilean false | R004 | P01 | Chile, Argentina | Cupressaceae | Dec 07, 1979 | Conifers and Cycads | Foreign | Threatened | NA | Foreign | P | Wherever found |
| Flaveria mcdougalii | MacDougal''s Yellowtops | Yellowtops, MacDougal''s | Q2A9 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Floridobia mica | Ichetucknee siltsnail | Siltsnail, Ichetucknee | G036 | I01 | FL; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Flueggea neowawraea | Mehamehame | Mehamehame | Q33K | P01 | HI; U.S.A. (HI) | Phyllanthaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Fluminicola anserinus | Goose Valley pebblesnail | Pebblesnail, Goose Valley | G0G2 | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Fluminicola columbiana | Columbia pebblesnail | Pebblesnail, Columbia | G02I | I01 | ID, OR, WA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Fluminicola multifarius | Shasta pebblesnail | Pebblesnail, Shasta | G0G4 | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Fluminicola potemicus | Potem Creek pebblesnail | Pebblesnail, Potem Creek | G0EQ | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Fluminicola seminalis | Nugget pebblesnail | Pebblesnail, nugget | G0EX | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Fluminicola sp | Diminuitive Pebblesnail | Pebblesnail, Diminuitive | G0EL | I01 | OR; | Hydrobiidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Fluminicola sp. | Longstreet Spring snail | Snail, Longstreet Spring | G03H | I01 | NV; Believed to be extinct | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Fluminicola spc | Nerite pebblesnail | Pebblesnail, Nerite | G0EP | I01 | Hydrobiidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Fluminicola sph | Globular pebblesnail | Pebblesnail, globular | G0EU | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Fluminicola spk | Tall pebblesnail | Pebblesnail, tall | G0EK | I01 | OR; | Hydrobiidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Fluminicola umbilicatus | Hat Creek pebblesnail | Pebblesnail, Hat Creek | G0G3 | I01 | CA; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Flyriella parryi | No common name | No common name | Q0UP | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Fontelicella davisi | Davis County springsnail | Springsnail, Davis County | G04Z | I01 | TX; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Fontelicella metcalfi | Presidio County springsnail | Springsnail, Presidio County | G050 | I01 | TX; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Fontigens holsingeri | Tapered cavesnail | Cavesnail, tapered | G04H | I01 | WV; | Hydrobiidae | NA | Snails | 5 | Not Listed | 5 | US | I | Wherever found |
| Fontigens turritella | Greenbrier cavesnail | Cavesnail, Greenbrier | G04F | I01 | WV; | Hydrobiidae | NA | Snails | 5 | Not Listed | 5 | US | I | Wherever found |
| Forchhammeria polyandra | No common name | No common name | Q3D8 | P01 | PR, VI; | Capparaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Forestiera godfreyi | Godfry's privet | privet, Godfry's | Q3PB | P01 | FL, GA, SC; | Oleaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Forestiera segregata pinetorum | No common name | No common name | Q0UQ | P01 | FL; | Oleaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Formicivora erythronotos | Black hooded (black-headed) antwren | Antwren, black hooded (black-headed) | B0D2 | V01 | Brazil | Thamnophilidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Fothergilla gardenii | Dwarf witch-alder | Witch-alder, dwarf | Q0UR | P01 | AL, FL, GA, NC, SC; | Hamamelidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Foudia flavicans | Rodrigues fody | Fody, Rodrigues | B09P | V01 | Indian Ocean-Mauritius (Rodrigues Island); Mauritius (Rodrigues Island) | Ploceidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Foudia rubra | Mauritius fody | Fody, Mauritius | B09O | V01 | Indian Ocean-Mauritius | Ploceidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Foudia sechellarum | Seychelles fody (weaver-finch) | Fody, Seychelles (weaver-finch) | B01M | V01 | Indian Ocean-Seychelles | Ploceidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Francolinus ochropectus | Djibouti francolin | Francolin, Djibouti | B09Q | V01 | Djibouti | Phasianidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Frankenia johnstonii | Johnston's frankenia | Frankenia, Johnston's | Q1WH | P01 | TX; Mexico-Nuevo Leon; U.S.A. (TX), Mexico (Nuevo Leon) | Frankeniaceae | Aug 07, 1984 | Flowering Plants | 2 | Recovery | 2 | US/Foreign | P | Wherever found |
| Franklinia alatamaha | Franklin tree | Franklin tree | Q0US | P01 | GA; | Theaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Frasera coloradensis | No common name | No common name | Q0UT | P01 | CO; | Gentianaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Frasera fastigiata | Umpqua green-gentian | Green-gentian, Umpqua | Q0UX | P01 | CA, OR; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Frasera gypsicola | [Unnamed] green-gentian | Green-gentian, [unnamed] | Q0UU | P01 | NV, UT; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Frasera idahoensis | No common name | No common name | Q0UV | P01 | ID, OR; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Frasera pahutensis | [Unnamed] green-gentian | Green-gentian, [unnamed] | Q0UW | P01 | NV; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Frasera puberulenta | No common name | No common name | Q2AA | P01 | CA; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Frasera tubulosa | No common name | No common name | Q2AB | P01 | CA; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fratercula arctica | Atlantic puffin | puffin, Atlantic | B0GC | V01 | ME; | Alcidae | NA | Birds | 5 | Not Listed | 5 | US | V | Wherever found |
| Fratercula cirrhata | Tufted Puffin | Puffin, Tufted | B0FO | V01 | AK, CA, OR, WA; | Laridae | NA | Birds | 1 | Under Review in the Candidate or Petition Process | 1, 7, 8 | US | V | Wherever found |
| Fraxinus anomala lowellii | [Unnamed] ash | Ash, [unnamed] | Q0UY | P01 | AZ; | Oleaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Fraxinus cuspidata macropetala | Large-petaled ash | Ash, large-petaled | Q0UZ | P01 | AZ, CA, NM, NV; | Oleaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Fraxinus gooddingii | Goodding's ash | Ash, Goodding's | Q0V0 | P01 | AZ; | Oleaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Fregata andrewsi | Andrew's frigatebird | Frigatebird, Andrew's | B051 | V01 | East Indian Ocean | Fregatidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Fremontodendron californicum ssp. decumbens | Pine Hill flannelbush | Flannelbush, Pine Hill | Q0V1 | P01 | CA; U.S.A. (CA) | Sterculiaceae | Oct 18, 1996 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Fremontodendron mexicanum | Mexican flannelbush | Flannelbush, Mexican | Q2OZ | P01 | CA; U.S.A. (CA), Mexico | Sterculiaceae | Oct 13, 1998 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Fritillaria agrestis | Stink bells | Stink bells | Q2P0 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria atropurpurea | Diamond Lake mission-bells | Mission-bells, Diamond Lake | Q0V2 | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Fritillaria brandegeei | Greenhorn fritillary | Fritillary, Greenhorn | Q0V3 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria eastwoodiae | Butte fritillary | Fritillary, Butte | Q0V4 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria falcata | Talus fritillary | Fritillary, talus | Q0V5 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria gentneri | Gentner's Fritillary | Fritillary, Gentner's | Q0V6 | P01 | CA, OR; U.S.A. (OR) | Liliaceae | Dec 10, 1999 | Flowering Plants | 1 | Endangered | 1, 8 | US | P | Wherever found |
| Fritillaria grayana | Roderick's fritillary | Fritillary, Roderick's | Q0V7 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria liliacea | Fragrant fritillary | Fritillary, fragrant | Q2P1 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria ojaiensis | Ojai frtillary | Frtillary, Ojai | Q2P2 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria pluriflora | [Unnamed] adobe-lily | Adobe-lily, [unnamed] | Q0V8 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria striata | Greenhorn adobe-lily | Adobe-lily, greenhorn | Q0V9 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fritillaria viridea | San Benito fritillary | Fritillary, San Benito | Q2TR | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Fryxellia pygmaea | Small fryxell wort | Fryxell wort, small | Q2TS | P01 | TX; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Fulica americana alai | Hawaiian coot | Coot, Hawaiian | B04G | V01 | HI; U.S.A. (HI) | Rallidae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Fulica caribaea | Caribbean coot | Coot, Caribbean | B083 | V01 | PR, VI; West Indies | Rallidae | NA | Birds | 4 | Not Listed | 4 | US | V | Puerto Rican |
| Fumonelix archeri | Archer's toothed land snail | Snail, Archer's toothed land | G03C | I01 | TN; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Fumonelix jonesiana | Big-tooth covert snail | Snail, big-tooth covert | G00O | I01 | NC, TN; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Fumonelix orestes | Engraved covert | Covert, engraved | G05X | I01 | NC; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Fundulus albolineatus | Whiteline topminnow | Topminnow, whiteline | E01R | V01 | AL; Believed to be extinct | Cyprinodontidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Fundulus jenkinsi | Saltmarsh topminnow | Topminnow, saltmarsh | E0BO | V01 | AL, FL, MS; | Fundulidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Fundulus julisia | Barrens topminnow | Topminnow, barrens | E05C | V01 | TN; | Cyprinodontidae | NA | Fishes | 4 | Proposed Endangered | 4 | US | V | Wherever found |
| Fundulus sciadicus | Plains topminnow | Topminnow, Plains | E07X | V01 | CO, IA, KS, MN, MO, NE, OK, SD, WY; | Cyprinodontidae | NA | Fishes | 6 | Not Listed | 2, 3, 6 | US | V | Wherever found |
| Fundulus waccamensis | Waccamaw killifish | Killifish, Waccamaw | E01F | V01 | NC; | Cyprinodontidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Fusconaia burkei | Tapered pigtoe | Pigtoe, tapered | F03W | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Fusconaia cor | Shiny pigtoe | Pigtoe, shiny | F00Q | I01 | AL, TN, VA; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Fusconaia cor | Shiny pigtoe | Pigtoe, shiny | F00Q | I02 | AL; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Fusconaia cor | Shiny pigtoe | Pigtoe, shiny | F00Q | I03 | U.S.A. (VA, TN, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Fusconaia cuneolus | Finerayed pigtoe | Pigtoe, finerayed | F00O | I01 | AL, TN, VA; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Fusconaia cuneolus | Finerayed pigtoe | Pigtoe, finerayed | F00O | I02 | U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Fusconaia cuneolus | Finerayed pigtoe | Pigtoe, finerayed | F00O | I03 | U.S.A. (VA, TN, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Fusconaia escambia | Narrow pigtoe | Pigtoe, narrow | F02T | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Fusconaia lananensis | Triangle Pigtoe | Pigtoe, Triangle | F056 | I01 | Unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Fusconaia masoni | Atlantic pigtoe | Pigtoe, Atlantic | F03K | I01 | GA, NC, VA; | Unionidae | NA | Clams | 4 | Proposed Threatened | 4, 5 | US | I | Wherever found |
| Fusconaia mitchelli | false spike | Spike, false | F031 | I01 | TX; | Unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Fusconaia rotulata | Round Ebonyshell | Ebonyshell, round | F02G | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Fusconaia subrotunda | Longsolid | Longsolid | F04V | I01 | AL, AR, GA, IL, IN, KY, NC, OH, PA, TN, VA, WV; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | I | Wherever found |
| Gahnia lanaiensis | No common name | No common name | Q1WI | P01 | HI; U.S.A. (HI) | Cyperaceae | Sep 20, 1991 | Flowering Plants | 1 | Original Data in Error - Taxonomic Revision | 1 | US | P | Wherever found |
| Gaillardia aestivalis winkleri | White blanketflower | Blanketflower, white | Q33M | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Gaillardia flava | Yellow blanketflower | Blanketflower, yellow | Q0VA | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Galactia eggersii | No common name | No common name | Q0VB | P01 | VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Galactia pinetorum | [Unnamed] milkpea | Milkpea, [unnamed] | Q0VC | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Galactia smallii | Small's milkpea | Milkpea, Small's | Q2RJ | P01 | FL; U.S.A. (FL) | Fabaceae | Jul 18, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Galinsoga semicalva percalva | No common name | No common name | Q0VD | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Galium andrewsii gatense | [Unnamed] bedstraw | Bedstraw, [unnamed] | Q2AC | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium angustifolium borregoense | Borrego bedstraw | Bedstraw, Borrego | Q0VE | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| galium angustifolium ssp. jacinticum | San Jacinto Mountains bedstraw | bedstraw, San Jacinto Mountains | Q3JX | P01 | rubiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Galium buxifolium | Island bedstraw | Bedstraw, island | Q0VF | P01 | CA; U.S.A. (CA) | Rubiaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Galium californicum luciense | Cone Peak bedstraw | Bedstraw, Cone Peak | Q0VH | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium californicum miguelense | San Miguel Island bedstraw | Bedstraw, San Miguel Island | Q2AD | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium californicum primum | San Jacinto bedstraw | Bedstraw, San Jacinto | Q0VI | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium californicum ssp. sierrae | El Dorado bedstraw | Bedstraw, El Dorado | Q0VG | P01 | CA; U.S.A. (CA) | Rubiaceae | Oct 18, 1996 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Galium catalinense acrispum | San Clemente island bedstraw | Bedstraw, San Clemente island | Q0VJ | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium clementis | Santa Lucia bedstraw | Bedstraw, Santa Lucia | Q0VK | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium collomae | [Unnamed] bedstraw | Bedstraw, [unnamed] | Q0VL | P01 | AZ; | Rubiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Galium correllii | Cliff bedstraw | Bedstraw, cliff | Q0VM | P01 | TX; | Rubiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Galium glabrescens modocense | Modoc bedstraw | Bedstraw, Modoc | Q0VN | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium grande | San Gabriel bedstraw | Bedstraw, San Gabriel | Q0VO | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium hardhamiae | Hardham's bedstraw | Bedstraw, Hardham's | Q0VP | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium hilendiae kingstonense | Kingston bedstraw | Bedstraw, Kingston | Q0VQ | P01 | CA, NV; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium hypotrichium tomentellum | Telescope Peak bedstraw | Bedstraw, Telescope Peak | Q0VR | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium serpenticum scotticum | Scott Mountains bedstraw | Bedstraw, Scott Mountains | Q0VS | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Galium serpenticum warnerense | Warner Mountains bedstraw | Bedstraw, Warner Mountains | Q0VT | P01 | CA; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gallicolumba canifrons | Palau ground dove | Dove, Palau ground | B085 | V01 | Palau,West Pacific Ocean | Columbidae | Jun 02, 1970 | Birds | Foreign | Recovery | NA | US/Foreign | V | Wherever found |
| Gallicolumba stairi | Friendly Ground-Dove | Ground-Dove, Friendly | B0AJ | V01 | AS; ; U.S.A. (AS) | Columbidae | Oct 24, 2016 | Birds | 1 | Endangered | 1 | US | V | American Samoa DPS |
| Gallicolumba xanthonura xanthonura | Guam white-throated ground-dove | Ground-dove, Guam white-throated | B05Z | V01 | GU, MP; | Columbidae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| Gallinula chloropus guami | Mariana common moorhen | Moorhen, Mariana common | B062 | V01 | GU, MP; West Pacific Ocean—U.S.A. (Guam, Tinian, Saipan, Pagan) | Rallidae | Aug 27, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Gallinula galeata sandvicensis | Hawaiian common gallinule | gallinule, Hawaiian common | B00H | V01 | HI; U.S.A. (HI) | Rallidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Gallirallus (=Tricholimnas) sylvestris | Lord Howe wood rail | Rail, Lord Howe wood | B05M | V01 | Australia (Lord Howe Island) | Rallidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gallotia simonyi simonyi | Hierro giant lizard | Lizard, Hierro giant | C034 | V01 | Spain (Canary Islands) | Lacertidae | Feb 29, 1984 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gambelia silus | Blunt-nosed leopard lizard | Lizard, blunt-nosed leopard | C001 | V01 | CA; U.S.A. (CA) | Crotaphytidae | Mar 11, 1967 | Reptiles | 8 | Endangered | 8 | US | V | Wherever found |
| Gambelia speciosa | Island snapdragon | Snapdragon, island | Q2P3 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| gambelia wislizenii | Long-nosed leopard lizard | lizard, Long-nosed leopard | C06U | V01 | crotaphytidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| gambelia wislizenii ssp. wislizenii | Large-spotted leopard lizard | lizard, Large-spotted leopard | C06O | V01 | crotaphytidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Gambusia amistadensis | Amistad gambusia | Gambusia, Amistad | E022 | V01 | TX; Believed to be extinct | Cyprinodontidae | Apr 30, 1980 | Fishes | 2 | Extinction | 2 | US | V | Wherever found |
| Gambusia clarkhubbsi | San Felipe gambusia | Gambusia, San Felipe | E0AK | V01 | Poeciliidae | NA | Fishes | 2 | Not Listed | NA | US | V | Wherever found | |
| Gambusia gaigei | Big Bend gambusia | Gambusia, Big Bend | E004 | V01 | TX; U.S.A. (TX) | Poeciliidae | Mar 11, 1967 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Gambusia georgei | San Marcos gambusia | Gambusia, San Marcos | E021 | V01 | TX; Possibly extinct; U.S.A. (TX) | Poeciliidae | Jul 14, 1980 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Gambusia heterochir | Clear Creek gambusia | Gambusia, Clear Creek | E005 | V01 | TX; U.S.A. (TX) | Poeciliidae | Mar 11, 1967 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Gambusia nobilis | Pecos gambusia | Gambusia, Pecos | E00V | V01 | NM, TX; U.S.A. (TX, NM) | Poeciliidae | Oct 13, 1970 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Gambusia senilis | Blotched gambusia | Gambusia, blotched | E03P | V01 | TX; | Poeciliidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Gammarus acherondytes | Illinois cave amphipod | Amphipod, Illinois cave | K021 | I01 | IL; U.S.A. (IL) | Gammaridae | Sep 03, 1998 | Crustaceans | 3 | Endangered | 3 | US | I | Wherever found |
| Gammarus bousfieldi | Bousfield's amphipod | Amphipod, Bousfield's | K01Z | I01 | KY; | Gammaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Gammarus desperatus | Noel's Amphipod | Amphipod, Noel's | K023 | I01 | NM; U.S.A. (NM) | Gammaridae | Aug 09, 2005 | Crustaceans | 2 | Endangered | 2 | US | I | Wherever found |
| Gammarus hyalleloides | Diminutive Amphipod | Amphipod, diminutive | K020 | I01 | NM, TX; | Gammaridae | Jul 09, 2013 | Crustaceans | 2 | Endangered | 2 | US | I | Wherever found |
| Gammarus pecos | Pecos amphipod | Amphipod, Pecos | K024 | I01 | TX; | Gammaridae | Jul 09, 2013 | Crustaceans | 2 | Endangered | 2 | US | I | Wherever found |
| Gardenia brighamii | Hawaiian gardenia (=Na`u) | Gardenia (=Na`u), Hawaiian | Q1WJ | P01 | HI; U.S.A. (HI) | Rubiaceae | Aug 21, 1985 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gardenia mannii | Nanu | Nanu | Q3GR | P01 | HI; U.S.A. (HI) | Rubiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gardenia remyi | Nanu | Nanu | Q33N | P01 | HI; | Rubiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gardenia taitensis | No common name | No common name | Q2AE | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gasterosteus aculeatus santaannae | Santa Ana threespine stickleback | Stickleback, Santa Ana threespine | E07U | V01 | CA; | Gasterosteidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gasterosteus aculeatus williamsoni | Unarmored threespine stickleback | Stickleback, unarmored threespine | E00X | V01 | CA; U.S.A. (CA) | Gasterosteidae | Oct 13, 1970 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Gastrocopta dalliana dalliana | Shortneck snaggletooth | Snaggletooth, shortneck | G08P | I01 | NM; | Pupillidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Gaura demareei | No common name | No common name | Q0VU | P01 | AR, OK; | Onagraceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Gaura neomexicana var. coloradensis | Colorado Butterfly plant | Butterfly plant, Colorado | Q0VV | P01 | CO, NE, WY; U.S.A. (WY, NE, CO) | Onagraceae | Oct 18, 2000 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Gavia adamsii | Yellow-billed loon | Loon, yellow-billed | B0DQ | V01 | AK; | Gaviidae | NA | Birds | 7 | Not Listed | 7 | US/Foreign | V | Wherever found |
| gavia immer | Common loon | loon, Common | B0EY | V01 | gaviidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Gavialis gangeticus | Gavial | Gavial | C009 | V01 | Pakistan, Nepal, India, Burma, Bangladesh | Crocodylidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gaylussacia brachycera | Box huckleberry | Huckleberry, box | Q2P4 | P01 | DE, KY, MD, PA, TN, VA, WV; | Ericaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Gazella cuvieri | Mountain (=Cuvier's) gazelle | Gazelle, mountain (=Cuvier's) | A012 | V01 | Entire | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella dama | Dama gazelle | Gazelle, dama | A0G4 | V01 | Entire | Bovidae | Sep 02, 2005 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella dama lozanoi | Rio de Oro Dama gazelle | Gazelle, Rio de Oro Dama | A015 | V01 | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Gazella dama mhorr | Mhorr gazelle | Gazelle, Mhorr | A013 | V01 | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Gazella dorcas massaesyla | Moroccan gazelle | Gazelle, Moroccan | A014 | V01 | Entire | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella dorcas pelzelni | Pelzeln's gazelle | Gazelle, Pelzeln's | A07M | V01 | Entire | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella dorcas saudiya | Saudi Arabian gazelle | Gazelle, Saudi Arabian | A07O | V01 | Israel,Iraq,Jordan,Syria,Arabian Peninsula | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella gazella | Arabian gazelle | Gazelle, Arabian | A07L | V01 | Arabian Peninsula,Palestine,Sinai; Arabian Peninsula,Palestine,Sinai Entire | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella leptoceros | Slender-horned gazelle | Gazelle, slender-horned | A016 | V01 | Algeria, Egypt, Libya, Sudan | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gazella subgutturosa marica | Sand gazelle | Gazelle, sand | A07N | V01 | Jordan, Arabian Peninsula ; Jordan,Arabian Peninsula | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gelochelidon nilotica | Gull-billed Tern | Tern, Gull-billed | B0JV | V01 | Laridae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Genistidium dumosum | [Unnamed] bush-pea | Bush-pea, [unnamed] | Q0VW | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Gentiana austromontana | No common name | No common name | Q2AF | P01 | NC, TN, VA, WV; | Gentianaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Gentiana autumnalis | Pine barren gentian | Gentian, pine barren | Q2AG | P01 | DE, NC, NJ, SC, VA; | Gentianaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Gentiana fremontii | Moss gentian | Gentian, moss | Q0VX | P01 | CA; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gentiana latidens | Balsam Mountain Gentian | Gentian, Balsam Mountain | Q3SM | P01 | NC; | Gentianaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Gentiana pennelliana | Wiregrass gentian | Gentian, wiregrass | Q0VY | P01 | FL; | Gentianaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Gentiana plurisetosa | Klamath gentian | Gentian, Klamath | Q3D9 | P01 | CA, OR; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Gentiana setigera | Mendocino gentian | Gentian, Mendocino | Q0VZ | P01 | CA, OR; | Gentianaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Gentiana villosa | [Unnamed] gentian | Gentian, [unnamed] | Q2AH | P01 | GA; | Gentianaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Gentianella propinqua aleutica | No common name | No common name | Q0W0 | P01 | AK; | Gentianaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Gentianella wislizenii | No common name | No common name | Q3DA | P01 | AZ; | Gentianaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Geocarpon minimum | No common name | No common name | Q1WK | P01 | AR, LA, MO, TX; U.S.A. (MO, LA, AR, TX) | Caryophyllaceae | Jun 16, 1987 | Flowering Plants | 4 | Threatened | 2, 3, 4 | US | P | Wherever found |
| Geochelone nigra (=elephantopus) | Galapagos tortoise | Tortoise, Galapagos | C00I | V01 | Ecuador (Galapagos Islands) | Testudinidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Geochelone radiata | Madagascar radiated tortoise | Tortoise, Madagascar radiated | C00J | V01 | Malagasy Republic (Madagascar) | Testudinidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Geochelone yniphora | Angulated tortoise | Tortoise, angulated | C01C | V01 | Malagasy Republic (Madagascar) | Testudinidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Geoclemys hamiltonii | Spotted pond turtle | Turtle, spotted pond | C01K | V01 | North India,Pakistan | Emydidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Geomys arenarius brevirostris | White Sands pocket gopher | Pocket gopher, White Sands | A0DE | V01 | NM; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Geomys bursarius arenarius | Desert pocket gopher | Pocket gopher, desert | A0HB | V01 | NM, TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Geomys bursarius breviceps | Mer Rouge pocket gopher | Pocket gopher, Mer Rouge | A0DF | V01 | LA; | Geomyidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Geomys colonus | Colonial pocket gopher | Pocket gopher, Colonial | A096 | V01 | GA; | Geomyidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Geomys cumberlandius | Cumberland pocket gopher | Pocket gopher, Cumberland | A097 | V01 | GA; | Geomyidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Geomys personatus maritimus | Maritime Texas pocket gopher | Pocket gopher, maritime Texas | A0CN | V01 | TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Geomys personatus streckeri | Carrizo Springs Texas pocket gopher | Pocket gopher, Carrizo Springs Texas | A0CO | V01 | TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Geomys pinetis fontanelus | Sherman's southeastern pocket gopher | Pocket gopher, Sherman's southeastern | A099 | V01 | GA; Believed to be extinct | Geomyidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Geomys pinetis goffi | Goff's southeastern pocket gopher | Pocket gopher, Goff's southeastern | A098 | V01 | FL; Believed to be extinct | Geomyidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| geomys streckeri | strecker's pocket gopher | No common name | A0J7 | V01 | geomyidae | NA | Mammals | 2 | Not Listed | NA | US | V | Wherever found | |
| Geomys texensis bakeri | Baker's Llano pocket gopher | Pocket gopher, Baker's Llano | A0HC | V01 | TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Geopsittacus occidentalis | Night (=Australian) parrot | Parrot, night (=Australian) | B02H | V01 | Australia | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Geothlypis trichas insperata | Brownsville common yellowthroat | Yellowthroat, Brownsville common | B08U | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Geothlypis trichas sinuosa | Common Yellowthroat | Yellowthroat, Common | B080 | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Geranium arboreum | Nohoanu | Geranium, Hawaiian red-flowered | Q1WL | P01 | HI; U.S.A. (HI) | Geraniaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Geranium caespitosum | [Unnamed] geranium | Geranium, [unnamed] | Q0W3 | P01 | NV; | Geraniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Geranium caespitosum | [Unnamed] geranium | Geranium, [unnamed] | Q0W2 | P01 | UT; | Geraniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Geranium cuneatum hololeucum | Native geranium | Geranium, native | Q0W1 | P01 | HI; | Geraniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Geranium hanaense | Nohoanu | Nohoanu | Q3HM | P01 | HI; | Geraniaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Geranium hillebrandii | Nohoanu | Nohoanu | Q3DB | P01 | HI; | Geraniaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Geranium kauaiense | Nohoanu | Nohoanu | Q33O | P01 | HI; U.S.A. (HI) | Geraniaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Geranium multiflorum | Nohoanu | Nohoanu | Q2AI | P01 | HI; U.S.A. (HI) | Geraniaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Geronticus eremita | Northern bald ibis | Ibis, northern bald | B06B | V01 | Southern Europe, Southwestern Asia, Northern Africa | Threskiornithidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gesneria pauciflora | No common name | No common name | Q2TT | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Gesneriaceae | Mar 07, 1995 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Geum geniculatum | Bent avens | Avens, bent | Q0W4 | P01 | NC; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Geum lobatum | Lobed Barren Strawberry | Strawberry, Lobed Barren | Q3SI | P01 | NC; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Geum peckii | Mountain avens | Avens, mountain | Q0W5 | P01 | NH; | Rosaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Geum radiatum | Spreading avens | Avens, spreading | Q1WM | P01 | NC, TN; U.S.A. (TN, NC) | Rosaceae | Apr 05, 1990 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Gila alvordensis | Alvord chub | Chub, Alvord | E06G | V01 | NV, OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Gila bicolor euchila | Fish Creek Springs tui chub | Chub, Fish Creek Springs tui | E05K | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila bicolor eurysoma | Sheldon tui chub | Chub, Sheldon tui | E030 | V01 | NV, OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Gila bicolor isolata | Independence Valley tui chub | Chub, Independence Valley tui | E02T | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila bicolor newarkensis | Newark Valley tui chub | Chub, Newark Valley tui | E02V | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila bicolor obesa | Lahontan Creek tui chub | Tui chub, Lahontan Creek | E06C | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila bicolor oregonensis | XL Spring tui chub | Chub, XL Spring tui | E033 | V01 | OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Gila bicolor ssp. | Summer Basin tui chub | Chub, Summer Basin tui | E031 | V01 | OR; | Cyprindidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Summer Basin |
| Gila bicolor ssp. | Dixie Valley tui chub | Chub, Dixie Valley tui | E02N | V01 | NV; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Dixie Valley |
| Gila bicolor ssp. | High Rock Springs tui chub | Chub, High Rock Springs tui | E02Q | V01 | CA; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | High Rock |
| Gila bicolor ssp. | Hot Creek Valley tui chub | Chub, Hot Creek Valley tui | E02R | V01 | NV; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila bicolor ssp. | Fish Lake Valley tui chub | Chub, Fish Lake Valley tui | E02O | V01 | NV; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Fish Lake |
| Gila bicolor ssp. | Railroad Valley tui chub | Chub, Railroad Valley tui | E02Y | V01 | NV; | Cyprindidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Railroad Valley |
| Gila bicolor ssp. | Hutton tui chub | Chub, Hutton tui | E02S | V01 | OR; U.S.A. (OR) | Cyprinidae | Mar 28, 1985 | Fishes | 1 | Threatened | 1 | US | V | Wherever found |
| Gila bicolor ssp. | Big Smoky Valley tui chub | Chub, Big Smoky Valley tui | E02K | V01 | NV; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Big Smoky |
| Gila bicolor ssp. | Catlow tui chub | Chub, Catlow tui | E02L | V01 | OR; | Cyprindidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Catlow |
| Gila bicolor ssp. | Pleasant Valley tui chub | Chub, Pleasant Valley tui | E02X | V01 | NV; | Cyprindidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Pleasant Valley |
| Gila bicolor ssp. mohavensis | Mohave tui chub | Tui chub, Mohave | E00Q | V01 | CA; U.S.A. (CA) | Cyprinidae | Oct 13, 1970 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Gila bicolor ssp. snyderi | Owens Tui Chub | Chub, Owens Tui | E02W | V01 | CA; U.S.A. (CA) | Cyprinidae | Aug 05, 1985 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Gila bicolor vaccaceps | Cow Head tui chub | Chub, Cow Head tui | E02M | V01 | CA; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Gila boraxobius | Borax Lake chub | Chub, Borax Lake | E027 | V01 | OR; U.S.A. (OR) | Cyprinidae | May 28, 1980 | Fishes | 1 | Endangered | 1 | US | V | Wherever found |
| Gila crassicauda | Thicktail chub | Chub, Thicktail | E032 | V01 | CA; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila cypha | Humpback chub | Chub, humpback | E000 | V01 | AZ, CO, NV, UT, WY; U.S.A. (WY, UT, CO, AZ) | Cyprinidae | Mar 11, 1967 | Fishes | 6 | Endangered | 2, 6, 8 | US | V | Wherever found |
| Gila ditaenia | Sonora chub | Chub, Sonora | E029 | V01 | AZ; U.S.A. (AZ), Mexico | Cyprinidae | Apr 30, 1986 | Fishes | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Gila elegans | Bonytail chub | Chub, bonytail | E020 | V01 | AZ, CA, CO, NV, UT; U.S.A. (WY, UT, NV, CO, CA, AZ) | Cyprinidae | Apr 23, 1980 | Fishes | 6 | Endangered | 2, 6, 8 | US | V | Wherever found |
| Gila intermedia | Gila chub | Chub, Gila | E02P | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Cyprinidae | Nov 02, 2005 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Gila nigra | Headwater chub | Chub, headwater | E0AH | V01 | AZ, NM; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Gila nigrescens | Chihuahua chub | Chub, Chihuahua | E028 | V01 | NM; Mexico-Chihuahua; U.S.A. (NM), Mexico-Chihuahua | Cyprinidae | Oct 11, 1983 | Fishes | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Gila orcuttii | Arroyo chub | Chub, arroyo | E08L | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Gila purpurea | Yaqui chub | Chub, Yaqui | E034 | V01 | AZ; U.S.A. (AZ), Mexico | Cyprinidae | Aug 31, 1984 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Gila robusta | Roundtail chub | Chub, roundtail | E02Z | V01 | AZ, NM; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Lower Colorado River Basin DPS |
| Gila robusta jordani | Pahranagat roundtail chub | Chub, Pahranagat roundtail | E00R | V01 | NV; U.S.A. (NV) | Cyprinidae | Oct 13, 1970 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Gila seminuda (=robusta) | Virgin River Chub | Chub, Virgin River | E02A | V01 | AZ, NV, UT; U.S.A. (UT, NV, AZ) | Cyprinidae | Aug 24, 1989 | Fishes | 6 | Endangered | 2, 6, 8 | US | V | Wherever found |
| Gilia maculata | Little San Bernardino Mountains gilia | Gilia, Little San Bernardino Mountains | Q0W7 | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gilia mcvickerae | No common name | No common name | Q0W8 | P01 | UT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Gilia nyensis | No common name | No common name | Q0W9 | P01 | NV; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gilia pentstemonoides | No common name | No common name | Q0WA | P01 | CO; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Gilia ripleyi | No common name | No common name | Q0WB | P01 | CA, NV; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gilia sedifolia | Stonecrop Gily flower | flower Stonecrop Gily | Q3M2 | P01 | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Gilia tenuiflora ssp. arenaria | Monterey gilia | Gilia, Monterey | Q2AJ | P01 | CA; U.S.A. (CA) | Polemoniaceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Gilia tenuiflora ssp. hoffmannii | Hoffmann's slender-flowered gilia | Gilia, Hoffmann's slender-flowered | Q0WC | P01 | CA; U.S.A. (CA) | Polemoniaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Gilia tenuis | Mussentuchit gilia | gilia, Mussentuchit | Q3DC | P01 | UT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Gilmania luteola | Golden carpet | Golden carpet | Q0WD | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Giraffa camelopardalis | Giraffe | Giraffe | A0L9 | V01 | Giraffidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Entire | |
| Githopsis diffusa filicaulis | Mission Canyon bluecup | Bluecup, Mission Canyon | Q2P5 | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Glacicavicola bathysciodes | Blind cave leiodid | Leiodid, blind cave | I088 | I01 | ID; | Leiodidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Glandularia maritima | No common name | No common name | Q2LP | P01 | FL; | Verbenaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Glandularia tampensis | [Unnamed] vervain | Vervain, [unnamed] | Q23P | P01 | FL; | Verbenaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Glaresis arenata | Kelso Dune glaresis scarab | Scarab, Kelso Dune glaresis | I0D0 | I01 | CA; | Glaresidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Glaucidium brasilianum cactorum | Cactus ferruginous pygmy-owl | Pygmy-owl, cactus ferruginous | B08N | V01 | AZ; | Strigidae | Mar 10, 1997 | Birds | 2 | Original Data in Error - Not a listable entity | 2 | US/Foreign | V | U.S.A. (AZ) |
| Glaucomys sabrinus californicus | San Bernardino northern flying squirrel | Squirrel, San Bernardino northern flying | A0EM | V01 | CA; | Sciuridae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Glaucomys sabrinus coloratus | Carolina northern flying squirrel | Squirrel, Carolina northern flying | A09M | V01 | NC, TN, VA; ; U.S.A. (TN, NC) | Sciuridae | Jul 01, 1985 | Mammals | 4 | Endangered | 4, 5 | US | V | Wherever found |
| Glaucomys sabrinus fuscus | Virginia northern flying Squirrel | Squirrel, Virginia northern flying | A09R | V01 | VA, WV; U.S.A. (WV,VA) | Sciuridae | Jul 31, 1985 | Mammals | 5 | Recovery | 5 | US | V | Wherever found |
| Glaucomys sabrinus griseifrons | Prince of Wales flying squirrel | Squirrel, Prince of Wales flying | A0EL | V01 | AK; | Sciuridae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Glaucopsyche lygdamus palosverdesensis | Palos Verdes blue butterfly | Butterfly, Palos Verdes blue | I01B | I01 | CA; U.S.A. (CA) | Lycaenidae | Jul 02, 1980 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Glaucopsyche xerces | Xerces blue | Blue, Xerces | I02P | I01 | CA; Believed to be extinct | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Gloeocantharellus purpurascens | Indian Creek mushroom | Mushroom, Indian Creek | Q2AK | P01 | NC; | Gomphaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| glossopetalon clokeyi | Clokey greasebush | greasebush, Clokey | Q3JF | P01 | crossosomataceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Glossopetalon clokeyi | Clokey's forsellesia | Forsellesia, Clokey's | Q33L | P01 | NV; | Crossosomataceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Glossopetalon pungens glabra | Smooth pungent forsellesia | Forsellesia, smooth pungent | Q0WF | P01 | CA, NV; | Crossosomataceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Glossopetalon texense | Texas greasebush | Greasebush, Texas | Q2TQ | P01 | TX; | Crossosomataceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Glyceria nubigena | Smoky Mountains manna grass | Manna grass, Smoky Mountains | Q0WG | P01 | NC; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Glyphodes cyanomichla | Blue glyphodes moth | Moth, blue glyphodes | I0AM | I01 | HI; | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Glyphodes exaula | Green glyphodes moth | Moth, green glyphodes | I0AS | I01 | HI; | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Glyphopsyche missouri | Missouri glyphopsyche caddisfly | Caddisfly, Missouri glyphopsyche | I041 | I01 | MO; | Limnephilidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Glyphopsyche sequatchie | Sequatchie caddisfly | Caddisfly, Sequatchie | I0RI | I01 | TN; | Limnephilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Glyphyalinia clingmani | Fragile supercoil | Supercoil, fragile | G08S | I01 | NC; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Glyphyalinia pecki | Blind glyph | Glyph, blind | G01W | I01 | AL; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Glyphyalinia raderi | Maryland glyph | Glyph, Maryland | G04K | I01 | VA; | Zonitidae | NA | Snails | 5 | Not Listed | 5 | US | I | Wherever found |
| Glyptemys insculpta | Wood turtle | Turtle, wood | C06A | V01 | CT, DC, DE, IA, MA, MD, ME, MI, MN, NH, NJ, NY, OH, PA, VA, VT, WI, WV; | Emydidae | NA | Reptiles | 5 | Under Review in the Candidate or Petition Process | 3, 5 | US/Foreign | V | Wherever found |
| Gnaphalium obtusifolium saxicola | Saxicola rock catfoot | Catfoot, saxicola rock | Q0WI | P01 | WI; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Gnaphalium sandwicensium flagellare | Whip `ena`ena | `Ena`ena, whip | Q0WJ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Goeracea oregona | Sagehen Creek goeracean caddisfly | Caddisfly, Sagehen Creek goeracean | I0J0 | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Goetzea elegans | Beautiful goetzea | Goetzea, beautiful | Q2AL | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Solanaceae | Apr 19, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Gomphus adelphus | Hudson clubtail dragonfly | Dragonfly, Hudson clubtail | I06Q | I01 | MA, NY; | Gomphidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Gomphus consanguis | Cherokee clubtail | Clubtail, Cherokee | I056 | I01 | GA, VA; | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Gomphus lynnae | Lynn's clubtail | Clubtail, Lynn's | I0N7 | I01 | WA; | Gomphidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Gomphus parvidens carolinus | Sandhills clubtail | Clubtail, sandhills | I0KU | I01 | NC, SC; | Gomphidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Gomphus sandrius | Tennessee clubtail | Clubtail, Tennessee | I057 | I01 | TN; | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Gomphus septima | Septima's clubtail | Clubtail, Septima's | I058 | I01 | AL, NC, SC; | Gomphidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Gomphus westfalli | Westfall's clubtail | Clubtail, Westfall's | I0N8 | I01 | FL; | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Goniobasis semicarinata indianensis | Indiana river snail | Snail, Indiana river | G021 | I01 | IN; | Pleuroceridae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Gonocalyx concolor | No common name | No common name | Q2TV | P01 | PR; | Ericaceae | Oct 09, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Gopherus agassizii | Desert tortoise | Tortoise, desert | C04L | V02 | AZ; U.S.A. (UT, NV, CA, AZ), Mexico | Testudinidae | Apr 02, 1990 | Reptiles | 8 | Similarity of Appearance to a Threatened Taxon | 2 | US/Foreign | V | AZ south and east of Colorado R., and Mexico, when found outside of Mexico or said range in AZ |
| Gopherus agassizii | Desert tortoise | Tortoise, desert | C04L | V05 | AZ, CA, NV, UT; ; North and west of the Colorado River in the Mojave Desert of California, Nevada, Arizona, and southwestern Utah, and in the Sonoran (Colorado) Desert in California | Testudinidae | Aug 20, 1980 | Reptiles | 8 | Threatened | 2, 6, 8 | US/Foreign | V | Wherever found, except AZ south and east of Colorado R., and Mexico |
| Gopherus flavomarginatus | Bolson tortoise | Tortoise, Bolson | C02H | V01 | Mexico | Testudinidae | May 17, 1979 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gopherus morafkai | Sonoran desert tortoise | Tortoise, Sonoran desert | C07G | V01 | AZ; | Testudinidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Gopherus polyphemus | Gopher tortoise | Tortoise, gopher | C044 | V01 | AL, LA, MS; Southeast Louisiana, southern Mississippi to southwest Alabama (west of the Mobile/Tombigbee rivers); U.S.A. (SC, MS, LA, GA, FL, AL) | Testudinidae | Jul 07, 1987 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found west of Mobile and Tombigbee Rivers in AL, MS, and LA |
| Gopherus polyphemus | Gopher tortoise | Tortoise, gopher | C044 | V02 | AL, FL, GA, SC; | Testudinidae | NA | Reptiles | 4 | Candidate | 4 | US | V | eastern |
| Gopherus polyphemus | Gopher tortoise | Tortoise, gopher | C044 | V03 | Testudinidae | NA | Reptiles | 4 | Not Listed | NA | US | V | U.S.A. (Florida) | |
| Gorilla gorilla | Gorilla | Gorilla | A017 | V01 | Wherever found | Pongidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gossypium tomentosum | Hawaiian cotton | Cotton, Hawaiian | Q1WO | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouania hillebrandii | No common name | No common name | Q1WP | P01 | HI; U.S.A. (HI) | Rhamnaceae | Nov 09, 1984 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gouania meyenii | No common name | No common name | Q1WQ | P01 | HI; U.S.A. (HI) | Rhamnaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gouania vitifolia | No common name | No common name | Q1WR | P01 | HI; U.S.A. (HI) | Rhamnaceae | Jun 27, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Gouldia st-johnii munroi | No common name | No common name | Q0WK | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis bobeoides | No common name | No common name | Q0WL | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis congesta | No common name | No common name | Q0WM | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis crassicaulis | No common name | No common name | Q0WN | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis degeneri | No common name | No common name | Q0WO | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis lanai | No common name | No common name | Q0WP | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis parvifolia | No common name | No common name | Q0WQ | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis pseudodichotoma | No common name | No common name | Q0WR | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis pubescens | No common name | No common name | Q0WS | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis quadrangularis | No common name | No common name | Q0WT | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis rotundifolia | No common name | No common name | Q0WU | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gouldia terminalis subcordata | No common name | No common name | Q0WV | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Graffenrieda ottoschulzii | Petites Graines camasey | Camasey, Petites Graines | Q2TW | P01 | PR, VI; | Melastomataceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Grallaria milleri | Brown-banded antpitta | Antpitta, brown-banded | B0BK | V01 | Colombia | Formicariidae | Nov 29, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grammitis nimbata | Dwarf polypody | Polypody, dwarf | S00S | P01 | NC; | Grammitidaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Graphis sterlingiana | Sterlings lips | lips, Sterlings | U00Y | P01 | NC; | Graphidaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Graphium levassori | Swallowtail butterfly | Butterfly, swallowtail | I0SE | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Graphium sandawanum | Swallowtail butterfly | Butterfly, swallowtail | I0SF | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Grapholita edwardsiana | San Francisco tree lupine moth | Moth, San Francisco tree lupine | I01D | I01 | CA; | Olethreutidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Graptemys barbouri | Barbour's map turtle | Turtle, Barbour's map | C047 | V01 | FL, GA; | Emydidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Graptemys caglei | Cagle's map turtle | Turtle, Cagle's map | C01X | V01 | TX; | Emydidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Graptemys ernsti | Escambia Map turtle | turtle, Escambia Map | C07V | V01 | AL, FL; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Graptemys flavimaculata | Yellow-blotched map turtle | Turtle, yellow-blotched map | C025 | V01 | MS; U.S.A. (MS) | Emydidae | Jan 14, 1991 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Graptemys gibbonsi | Pascagoula map turtle | Turtle, Pascagoula map | C06F | V01 | LA, MS; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Graptemys nigrinoda | Black-knobbed map turtle | Turtle, black-knobbed map | C01V | V01 | AL, MS; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Graptemys oculifera | Ringed map turtle | Turtle, ringed map | C022 | V01 | LA, MS; U.S.A. (MS, LA) | Emydidae | Dec 23, 1986 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Graptemys ouachitensis sabinensis | Sabine Map Turtle | Turtle, Sabine Map | C023 | V01 | LA, TX; | Emydidae | NA | Reptiles | 2 | Not Listed | 2, 4 | US | V | Wherever found |
| Graptemys pseudogeographica | False map turtle | Turtle, false map | C064 | V01 | IN, MN, MO, ND, WI; | Emydidae | NA | Reptiles | 6 | Not Listed | 3, 6 | US | V | Wherever found |
| Graptemys pulchra | Alabama Map turtle | turtle, Alabama Map | C07W | V01 | AL, GA, MS; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Graptemys versa | Texas map turtle | Turtle, Texas map | C024 | V01 | TX; | Emydidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Graptopetalum bartramii | Bartram stonecrop | Stonecrop, Bartram | Q0WW | P01 | AZ; U.S.A. (AZ), Mexico | Crassulaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Graptopetalum rusbyi | No common name | No common name | Q0WX | P01 | AZ, NM; | Crassulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Gratiola heterosepala | Boggs Lake hedge-hyssop | Hedge-hyssop, Boggs Lake | Q0WY | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Grimmia americana | American dry rock moss | Moss, American dry rock | Q3MF | P01 | NV; | Grimmiaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Grindelia fraxinipratensis | Ash Meadows gumplant | Gumplant, Ash Meadows | Q2AM | P01 | NV; U.S.A. (NV, CA) | Asteraceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Grindelia hirsuta maritima | San Francisco gumplant | Gumplant, San Francisco | Q2TX | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Grindelia hirsutula | Cuyamaca gumplant | Gumplant, Cuyamaca | Q2AN | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Grindelia howellii | Howell's gumplant | Gumplant, Howell's | Q0X0 | P01 | ID, MT; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Grindelia oolepis | Plains gumweed | Gumweed, plains | Q0X1 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Grindelia stricta blakei | Humboldt Bay gumplant | Gumplant, Humboldt Bay | Q2TY | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gronocarus multispinosus | Spiny Florida sandhill scarab | Scarab, spiny Florida sandhill | I0D1 | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Grus americana | Whooping crane | Crane, whooping | B003 | V01 | KS, MT, ND, NE, OK, SD, TX, WI; Canada, U.S.A. (Rocky Mountains east to Carolinas), Mexico; Ex.Pop. WI,FL | Gruidae | Mar 11, 1967 | Birds | 2 | Endangered | 2, 3, 6 | US/Foreign | V | Wherever found, except where listed as an experimental population |
| Grus americana | Whooping crane | Crane, whooping | B003 | V02 | CO, FL, NM, OK, TX; | Gruidae | Jan 22, 1993 | Birds | 4 | Experimental Population, Non-Essential | 2, 4, 6 | US/Foreign | V | U.S.A. (CO, ID, FL, NM, UT, and the western half of Wyoming) |
| Grus americana | Whooping crane | Crane, whooping | B003 | V03 | LA, MI, WI; U.S.A. (AL, AR, CO, FL, GA, ID, IL, IN, IA, KY, LA, MI, MN, MS, MO, NC, NM, OH, SC, TN, UT, VA, WI, WV, western half of WY) | Gruidae | Jun 26, 2001 | Birds | 2 | Experimental Population, Non-Essential | 3, 4 | US/Foreign | V | U.S.A. (AL, AR, CO, FL, GA, ID, IL, IN, IA, KY, LA, MI, MN, MS, MO, NC, NM, OH, SC, TN, UT, VA, WI, WV, western half of WY) |
| Grus americana | Whooping crane | Crane, whooping | B003 | V04 | Gruidae | Feb 03, 2011 | Birds | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A (Southwestern Louisiana) | |
| Grus canadensis nesiotes | Cuba sandhill crane | Crane, Cuba sandhill | B05U | V01 | West Indies-Cuba (Isle of Pines) | Gruidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grus canadensis pulla | Mississippi sandhill crane | Crane, Mississippi sandhill | B04I | V01 | AL, MS; U.S.A. (MS) | Gruidae | Jun 04, 1973 | Birds | 4 | Endangered | 4 | US | V | Wherever found |
| Grus canadensis tabida | Greater Sandhill Crane | Crane, Greater Sandhill | B0DR | V01 | Gruidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Grus japonensis | Japanese Crane | Crane, Japanese | B016 | V01 | China,Japan,North Korea,South Korea,Russia, Mongolia; China,Japan,North Korea,South Korea,U.S.S.R | Gruidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grus leucogeranus | Siberian white Crane | Crane, Siberian white | B03Z | V01 | U.S.S.R (Siberia) to India,including Iran and China | Gruidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grus monacha | Hooded Crane | Crane, hooded | B04U | V01 | Japan,Russia; Japan,U.S.S.R | Gruidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grus nigricollis | Black-necked Crane | Crane, black-necked | B04T | V01 | China (Tibet) | Gruidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Grus vipio | White-naped Crane | Crane, white-naped | B04V | V01 | Mongolia | Gruidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gryllotalpa major | Prairie mole cricket | Mole cricket, prairie | I0AI | I01 | AR, IL, KS, MO, MS, OK; | Gryllidae | NA | Insects | 3 | Not Listed | 2, 3, 4, 6 | US | I | Wherever found |
| Gulo gulo luscus | North American wolverine | Wolverine, North American | A0FA | V01 | CA, CO, ID, MT, NM, NV, OR, UT, WA, WY; | Mustelidae | NA | Mammals | 6 | Proposed Threatened | 1, 2, 6, 8 | US | V | Wherever found |
| Gulo gulo luscus | North American wolverine | Wolverine, North American | A0FA | V02 | Mustelidae | NA | Mammals | 6 | Not Listed | NA | US | V | Nonessential Experimental Population of the North American Wolverine in Colorado, Wyoming, and New Mexico | |
| Gulo gulo luteus | California wolverine | Wolverine, California | A0F9 | V01 | CA; The California wolverine (Gulo gulo luteus) was last documented in 1922. It is likely that this population has been extirpated. | Mustelidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Gunnera petaloidea | No common name | No common name | Q1WU | P01 | HI; | Haloragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gunnera petaloidea | No common name | No common name | Q1WT | P01 | HI; | Haloragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Gutierrezia californica | Bay matchweed | Matchweed, Bay | Q0X2 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Gutierrezia petradoria | No common name | No common name | Q33P | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Gutierrezia sarothrae | No common name | No common name | Q2AO | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Gutierrezia sarothrae pomariensis | No common name | No common name | Q0X3 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Gutierrezia wrightii | No common name | No common name | Q0WZ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Gymnobelideus leadbeateri | Leadbeater's Possum | Possum, Leadbeater's | A0FM | V01 | Wherever found | Phalangeridae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Gymnocarpium heterosporum | No common name | No common name | S013 | P01 | AK, MI, MN, WI; | Aspleniaceae | NA | Ferns and Allies | 3 | Not Listed | 3, 7 | US | P | Wherever found |
| Gymnocarpium sp. | Sp. nov. ined. (Appalachian) oak fern | Oak fern, sp. nov. ined. (Appalachian) | S01X | P01 | NC; | Aspleniaceae | NA | Ferns and Allies | 5 | Not Listed | 4 | US | P | Wherever found |
| Gymnocthebius maureenae | Maureen's gymnocthebius minute moss beetle | Minute moss beetle, Maureen's gymnocthebius | I0AA | I01 | MS; | Hydraenidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Gymnoderma lineare | Rock gnome lichen | Lichen, rock gnome | U001 | P01 | GA, NC, SC, TN, VA; U.S.A. (TN, NC) | Cladoniaceae | Jan 18, 1995 | Lichens | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Gymnogyps californianus | California condor | Condor, California | B002 | V01 | AZ, CA, UT; U.S.A. (OR, CA, AZ), Mexico (Baja California) | Cathartidae | Mar 11, 1967 | Birds | 8 | Endangered | 2, 6, 8 | US/Foreign | V | U.S.A. only, except where listed as an experimental population |
| Gymnogyps californianus | California condor | Condor, California | B002 | V02 | AZ, NV, UT; U.S.A. (OR, CA, AZ), Mexico (Baja California) | Cathartidae | Oct 16, 1996 | Birds | 8 | Experimental Population, Non-Essential | 2, 6, 8 | US | V | U.S.A. (specific portions of Arizona, Nevada, and Utah)-see 17.84(j) |
| Gymnogyps californianus | California condor | Condor, California | B002 | V03 | Cathartidae | May 05, 2019 | Birds | 8 | Proposed Experimental Population, Non-Essential | NA | US | V | U.S.A. (Oregon, and specific portions of northern California and northwest Nevada) | |
| Gymnomyza samoensis | Mao (= maomao) (honeyeater) | (honeyeater), Mao (= maomao) | B0L8 | V01 | ; The ma’oma’o was once found throughout Savaii and Upolu in forests from coast to mountain tops (MNRE 2006, p. 2). It is endemic to the islands of Savaii and Upolu, Samoa, and Tutuila Island, American Samoa (Watling 2001, p. 174; Engbring 1989, p. 68). The ma’oma’o was observed during an 1839 expedition on Tutuila (USFWS 1982, p. 72), two male specimens were collected in 1924, and an unconfirmed observation of the ma’oma’o on Tutuila was reported in 1977 (Watling 2001, p. 174; Enbring 1989, p. 68). The ma’oma’o is currently only found on the islands of Savaii and Upolu in Samoa (Watling 2001, p. 74; MNRE 2006, p. 2; USFWS 1982, p. 72; Engbring 1989, p. 68). Surveys conducted in American Samoa in 1982 and 1986 did not detect the ma’oma’o (USFWS 1982, p. 72; Engbring 1989; p. 68). Given that the species is noisy and conspicuous, it is unlikely that a population on Tutuila was missed during the surveys (Engbring 1989; p. 68). The ma’oma’o is likely extirpated from Tutuila (Freifeld 1999, p. 1208). | Meliphagidae | Oct 24, 2016 | Birds | 1 | Endangered | NA | US/Foreign | V | Wherever found |
| Gymnopogon chapmanianus | No common name | No common name | Q0X4 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Gymnorhinus cyanocephalus | Pinyon Jay | Jay, Pinyon | B0I0 | V01 | Corvidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Gyrinophilus gulolineatus | Berry Cave salamander | Salamander, Berry Cave | D03B | V01 | TN; U.S.A. (TN) | Plethodontidae | NA | Amphibians | 4 | Candidate | 4 | US | V | Wherever found |
| Gyrinophilus palleucus | Tennessee cave salamander | Salamander, Tennessee cave | D01L | V01 | AL, GA, TN; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Gyrinophilus subterraneus | West Virginia spring salamander | Salamander, West Virginia spring | D01M | V01 | WV; | Plethodontidae | NA | Amphibians | 5 | Under Review in the Candidate or Petition Process | 5 | US | V | Wherever found |
| Gyrotoma excisa | Excised slitshell | Slitshell, excised | G08J | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Gyrotoma lewisii | Striate slitshell | Slitshell, striate | G08O | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Gyrotoma pagoda | Pagoda slitshell | Slitshell, pagoda | G08K | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Gyrotoma pumila | Ribbed slitshell | Slitshell, ribbed | G08M | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Gyrotoma pyramidata | Pyramid slitshell | Slitshell, pyramid | G08L | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Gyrotoma walkeri | Round slitshell | Slitshell, round | G08N | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Hackelia brevicula | Poison Canyon stickseed | Stickseed, Poison Canyon | Q0X5 | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hackelia cronquistii | Cronquist's stickseed | Stickseed, Cronquist's | Q0X6 | P01 | OR; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hackelia davisii | Davis' stickseed | Stickseed, Davis' | Q0X7 | P01 | ID; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hackelia gracilenta | Mesa Verde stickleaf | Stickleaf, Mesa Verde | Q33S | P01 | CO; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hackelia hispida | No common name | No common name | Q0X8 | P01 | ID, OR, WA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hackelia ibapensis | [Unnamed] stickseed | Stickseed, [unnamed] | Q2P6 | P01 | UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hackelia ophiobia | [Unnamed] stickseed | Stickseed, [unnamed] | Q0X9 | P01 | NV, OR; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Hackelia sharsmithii | Sharsmth's stickseed | Stickseed, Sharsmth's | Q2AQ | P01 | CA, NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hackelia venusta | Showy stickseed | Stickseed, showy | Q0XA | P01 | WA; U.S.A. (WA) | Boraginaceae | Feb 06, 2002 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Haematopus bachmani | Black Oystercatcher | Oystercatcher, Black | B0KJ | V01 | Haematopodidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Haematopus chathamensis | Chatham Island oystercatcher | Oystercatcher, Chatham Island | B0CR | V01 | Haematopodidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Haematopus meadewaldoi | Canarian black oystercatcher | Oystercatcher, Canarian black | B09W | V01 | Atlantic Ocean Spain (Canary Islands); Spain (Canary Islands) | Haematopodidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Haematopus palliatus | American Oystercatcher | Oystercatcher, american | B0G8 | V01 | Charadriidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Haideoporus texanus | Texas cave diving beetle | Diving beetle, Texas cave | I06A | I01 | TX; | Dytiscidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Haideotriton wallacei | Georgia blind salamander | Salamander, Georgia blind | D016 | V01 | FL, GA; | Plethodontidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Halcyon cinnamomina cinnamomina | Guam Micronesian kingfisher | Kingfisher, Guam Micronesian | B061 | V01 | GU; Western Pacific Ocean U.S.A. (Guam) | Alcedinidae | Aug 27, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Haliaeetus albicilla groenlandicus | Greenland white-tailed eagle | Eagle, Greenland white-tailed | B04Y | V01 | Greenland and adjacent Atlantic Islands | Accipitridae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Haliaeetus leucocephalus | Bald eagle | Eagle, bald | B008 | V01 | AL, AR, AZ, CO, FL, IN, KY, MT, OH, PA, SC, TN, TX, VA, WY; | Accipitridae | Mar 11, 1967 | Birds | 3 | Recovery | 2, 3, 4, 5, 6 | US | V | U.S.A., conterminous (lower 48) States. |
| Haliaeetus leucocephalus | Bald eagle | Eagle, bald | B008 | V02 | AZ; | Accipitridae | NA | Birds | 2 | Not Listed | 2 | US | V | Southwest Distinct Population Segment |
| Haliaeetus leucocephalus | Bald eagle | Eagle, bald | B008 | V03 | AZ; Arizona: (1) Yavapai, northern Mexico. Gila, Graham, Pinal, and Maricopa, Counties; and (2) Southern Mohave County (that portion south and east of the center of Interstate Highway 40 and east of Arizona Highway 95), eastern LaPaz County (that portion east of the centerline of U.S. and Arizona Highways 95), and north of the centerline of Interstate Highway 8). | Accipitridae | May 01, 2008 | Birds | 2 | Not Listed | 2 | US | V | Sonoran Desert DPS: Arizona: (1) Yavapai, northern Mexico. Gila, Graham, Pinal, and Maricopa, Counties; and (2) Southern Mohave County (that portion south and east of the center of Interstate Highway 40 and east of Arizona Highway 95), eastern LaPaz County (that portion east of the centerline of U.S. and Arizona Highways 95), and north of the centerline of Interstate Highway 8). |
| Haliaeetus vociferoides | Madagascar sea eagle | Eagle, Madagascar sea | B09N | V01 | Madagascar | Accipitridae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Halimolobos perplexa lemhiensis | No common name | No common name | Q0XB | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Halimolobos perplexa perplexa | No common name | No common name | Q0XC | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Halimolobos virgata | Virgate halimolobus | Halimolobus, virgate | Q2AR | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Haliotis cracherodii | Black Abalone | Abalone, Black | G0FU | I01 | North America (West coast from Crescent City, CA, USA, to Cape San Lucas, Baja California, Mexico | Haliotidae | Apr 13, 2011 | Snails | NMFS | Endangered | NA | US | I | Wherever found |
| Haliotis sorenseni | White Abalone | Abalone, White | G0C8 | I01 | CA; North America (West coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) | Haliotidae | Nov 16, 2005 | Snails | NMFS | Endangered | 8 | US/Foreign | I | North America (West Coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) |
| Haliplus nitens | Disjunct crawling water beetle | Crawling water beetle, disjunct | I05D | I01 | TX; Possibly extinct,not reported since 1965 | Haliplidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Halocaridina palahemo | [Unnamed] shrimp | Shrimp, [unnamed] | K033 | I01 | HI; | Atyidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Halophila johnsonii | Johnson's seagrass | Seagrass, Johnson's | Q3AL | P01 | FL; U.S.A. (FL) | Hydrocharitaceae | Sep 14, 1998 | Flowering Plants | NMFS | Threatened | 4 | US | P | Wherever found |
| Hamiota australis | Southern sandshell | sandshell, Southern | F030 | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Hansonoperla appalachia | Hanson's appalachian stonefly | Stonefly, Hanson's appalachian | I0EB | I01 | KY, MA, NH, SC, TN; | Perlidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Haplopappus carthamoides subsquarrosus | No common name | No common name | Q3DD | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Haplopappus fremontii monocephalus | [Unnamed] goldenweed | Goldenweed, [unnamed] | Q0XE | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Haplopappus palmeri palmeri | Palmer's haplopappus | Haplopappus, Palmer's | Q2U0 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Haplopappus racemosus congestus | No common name | No common name | Q2AU | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Haplopappus spinulosus laevis | No common name | No common name | Q0XK | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Haploperla chukcho | Chukcho stonefly | Stonefly, Chukcho | I0M4 | I01 | MS; | Chloroperlidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Haplostachys bryanii | No common name | No common name | Q0XL | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Haplostachys haplostachya | Honohono | Honohono | Q1WW | P01 | HI; U.S.A. (HI) | Lamiaceae | Nov 29, 1979 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Haplostachys linearifolia | No common name | No common name | Q0XM | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Haplostachys munroi | No common name | No common name | Q0XN | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Haplostachys truncata | No common name | No common name | Q0XO | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Harpagonella palmeri | Palmer's grapplinghook | grapplinghook, Palmer's | Q3L3 | P01 | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Harpagonella palmeri palmeri | Palmer's grapplinghook | Grapplinghook, Palmer's | Q3DF | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Harperocallis flava | Harper's beauty | Beauty, Harper's | Q1WX | P01 | FL; U.S.A. (FL) | Liliaceae | Nov 01, 1979 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Harpia harpyja | Harpy eagle | Eagle, harpy | B04Z | V01 | Mexico south to Argentina | Accipitridae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Harrisia (=Cereus) aboriginum (=gracilis) | Aboriginal Prickly-apple | Prickly-apple, aboriginal | Q0DR | P01 | FL; | Cactaceae | Nov 25, 2013 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Harrisia portoricensis | Higo Chumbo | Chumbo, Higo | Q2AX | P01 | PR; Endemic to Puerto Rico. Currently known from Mona Island, Monito Island, Desecheo NWR and Caja de Muertos; U.S.A. (PR) | Cactaceae | Aug 08, 1990 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Hartwrightia floridana | Florida hartwrightia | Hartwrightia, Florida | Q0XP | P01 | FL, GA; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Hastingsia atropurpurea | No common name | No common name | Q3DG | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hastingsia bracteosa | No common name | No common name | Q0XQ | P01 | OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hazardia brickellioides | No common name | No common name | Q0XR | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hazardia cana | Island hazardia | Hazardia, island | Q0XS | P01 | CA; Mexico (Baja California Norte) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Hazardia orcuttii | Orcutt's hazardia | Hazardia, Orcutt's | Q2P8 | P01 | CA; Mexico (Baja California) | Asteraceae | NA | Flowering Plants | 8 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Hechtia texensis | No common name | No common name | Q0XT | P01 | TX; | Bromeliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma apiculatum | Mckittrick pennyroyal | Pennyroyal, Mckittrick | Q24D | P01 | NM, TX; | Lamiaceae | Jul 13, 1982 | Flowering Plants | 2 | Original Data in Error - New Information Discovered | 2 | US | P | Wherever found |
| Hedeoma dentatum | No common name | No common name | Q2AY | P01 | AZ; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma diffusum | Flagstaff pennyroyal | Pennyroyal, Flagstaff | Q2AZ | P01 | AZ; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma molle | No common name | No common name | Q2B0 | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma nanum californicum | No common name | No common name | Q2B1 | P01 | AZ, CA, NV; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Hedeoma pilosum | Old Blue mock pennyroyal | Pennyroyal, Old Blue mock | Q0XV | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma pulcherrimum | No common name | No common name | Q2B2 | P01 | NM; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedeoma todsenii | Todsen's pennyroyal | Pennyroyal, Todsen's | Q24C | P01 | NM; U.S.A. (NM) | Lamiaceae | Jan 19, 1981 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Hedylepta epicentra | Oahu swamp hedyleptan moth | Moth, Oahu swamp hedyleptan | I0BB | I01 | HI; Believed to be extinct | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hedylepta laysanensis | Laysan hedyleptan moth | Moth, Laysan hedyleptan | I0B1 | I01 | HI; Believed to be extinct | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hedylepta telegrapha | Telegraphic hedyleptan moth | Moth, telegraphic hedyleptan | I0BE | I01 | HI; Believed to be extinct | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hedyotis angusta angusta | No common name | No common name | Q0XW | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis angusta umbrosa | Narrow-leaved hedyotis | Hedyotis, narrow-leaved | Q0XX | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis butterwickiae | Mary's bluet | Bluet, Mary's | Q33X | P01 | TX; | Rubiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hedyotis elatior | No common name | No common name | Q0XY | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis foliosa | No common name | No common name | Q0XZ | P01 | HI; Believed to be extinct | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis formosa | No common name | No common name | Q0Y0 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis glaucifolia helleri | No common name | No common name | Q0Y1 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis littoralis | No common name | No common name | Q0Y2 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis megalantha | Paudedo | Paudedo | Q3OX | P01 | GU; | Rubiaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hedyotis nigricans pulvinata | [Unnamed] diamondflowers | Diamondflowers, [unnamed] | Q2U2 | P01 | FL; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hedyotis purpurea var. montana | Roan Mountain bluet | Bluet, Roan Mountain | Q2B3 | P01 | NC, TN, VA; U.S.A. (TN, NC) | Rubiaceae | Apr 05, 1990 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Hedyotis remyi nuttallii | No common name | No common name | Q0Y3 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis remyi plana | No common name | No common name | Q0Y4 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis schlechtendahliana nuttallii | No common name | No common name | Q1X3 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis schlechtendahliana plana | No common name | No common name | Q1X4 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis schlechtendahliana reticulata | No common name | No common name | Q0Y5 | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedyotis tryblium | No common name | No common name | Q33Z | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hedysarum boreale gremiale | No common name | No common name | Q0Y6 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hedysarum occidentale canone | No common name | No common name | Q2U3 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Helenium arizonicum | No common name | No common name | Q0Y7 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Helenium virginicum | Virginia sneezeweed | Sneezeweed, Virginia | Q2P9 | P01 | MO, VA; U.S.A. (VA, MO) | Asteraceae | Nov 03, 1998 | Flowering Plants | 5 | Threatened | 3, 5 | US | P | Wherever found |
| Helianthella castanea | Diablo rock-rose | Rock-rose, Diablo | Q0Y8 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Helianthemum dumosum | Bushy rush-rose | Rush-rose, bushy | Q0Y9 | P01 | CT, MA, NY, RI; | Cistaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Helianthemum greenei | Island rush-rose | Rush-rose, island | Q0YA | P01 | CA; U.S.A. (CA) | Cistaceae | Jul 31, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Helianthemum scoparium | Amador rush-rose | Rush-rose, Amador | Q0YB | P01 | CA; | Cistaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Helianthus carnosus | No common name | No common name | Q0YC | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helianthus debilis vestitus | Gulf beach sunflower | Sunflower, Gulf beach | Q0YD | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helianthus deserticola | No common name | No common name | Q0YE | P01 | AZ, NV, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Helianthus eggertii | Eggert's sunflower | Sunflower, Eggert's | Q2B4 | P01 | KY, TN; | Asteraceae | May 22, 1997 | Flowering Plants | 4 | Recovery | 4 | US | P | Wherever found |
| Helianthus exilis | Serpentine sunflower | Sunflower, serpentine | Q0YF | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Helianthus glaucophyllus | No common name | No common name | Q2B5 | P01 | AL, NC, SC, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helianthus laciniatus crenatus | No common name | No common name | Q2B6 | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Helianthus niveus tephrodes | Algodones Dunes sunflower | Sunflower, Algodones Dunes | Q0YH | P01 | AZ, CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US/Foreign | P | Wherever found |
| Helianthus nuttallii parishii | Los Angeles sunflower | Sunflower, Los Angeles | Q0YI | P01 | CA; Possibly extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Helianthus occidentalis ssp. plantagineus | Shinner's sunflower | sunflower, Shinner's | Q3PC | P01 | AR, LA, TX; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | P | Wherever found |
| Helianthus paradoxus | Pecos (=puzzle, =paradox) sunflower | Sunflower, Pecos (=puzzle, =paradox) | Q0YJ | P01 | NM, TX; U.S.A. (TX, NM) | Asteraceae | Oct 20, 1999 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Helianthus porteri | No common name | No common name | Q2LZ | P01 | AL, GA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helianthus praecox hirtus | Dimmit sunflower | Sunflower, Dimmit | Q0YK | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Helianthus praetermissus | No common name | No common name | Q0YL | P01 | NM; Believed to be extinct | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Helianthus schweinitzii | Schweinitz's sunflower | Sunflower, Schweinitz's | Q2B7 | P01 | NC, SC; U.S.A. (SC, NC) | Asteraceae | May 07, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Helianthus smithii | No common name | No common name | Q0YM | P01 | AL, GA, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helianthus verticillatus | Whorled Sunflower | Sunflower, whorled | Q3HO | P01 | AL, GA, MS, TN; U.S.A. (AL, GA, MS, TN) | Asteraceae | Aug 01, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Entire |
| Helicodiscus diadema | Shaggy coil | Coil, shaggy | G01P | I01 | VA; | Helicodiscidae | NA | Snails | 5 | Not Listed | 5 | US | I | Wherever found |
| Helicodiscus hexodon | Toothy coil | Coil, toothy | G01Q | I01 | TN; | Helicodiscidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Helicopsyche paralimnella | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NL | I01 | NC, SC; | Helicopsychidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Helicoverpa confusa | Confused helicoverpan noctuid moth | Moth, confused helicoverpan noctuid | I0AO | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Helicoverpa minuta | Minute helicoverpan noctuid moth | Moth, minute helicoverpan noctuid | I0B9 | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Heliomeris soliceps | Paria sunflower | Sunflower, Paria | Q2M0 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Heliotropium guanicense | Cotorrilla | Cotorrilla | Q0YN | P01 | PR, VI; | Boraginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Heliotropium polyphyllum horizontale | No common name | No common name | Q0YO | P01 | FL; | Boraginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Helisoma jacksonense | Jackson Lake snail | Snail, Jackson Lake | G03G | I01 | WY; | Planorbidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Helisoma newberryi | Great Basin Rams-horn | Rams-horn Great Basin | G0DV | I01 | Planorbidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Helminthoglypta allynsmithi | Merced Canyon shoulderband | Shoulderband, Merced Canyon | G007 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta arrosa mattolensis | Cape Mendocino snail | Snail, Cape Mendocino | G03D | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta arrosa miwoka | Dented Peninsula snail | Snail, dented Peninsula | G03E | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta arrosa pomoensis | Pomo bronze shoulderband | Shoulderband, Pomo bronze | G00L | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta arrosa williamsi | Williams' bronze shoulderband | Shoulderband, Williams' bronze | G02T | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta callistoderma | Kern shoulderband | Shoulderband, Kern | G02U | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta greggi | Mohave shoulderband | shoulderband, Mohave | G0G5 | I01 | CA; | Helminthoglyptidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta mohaveana | Victorville shoulderband | Shoulderband, Victorville | G02V | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta morroensis | Chorro shoulderband snail | shoulderband snail, Chorro | G0KT | I01 | Helminthoglyptidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | NA | US | I | Entire | |
| Helminthoglypta nickliniana awania | Peninsula Coast Range shoulderband | Shoulderband, Peninsula Coast Range | G006 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta nickliniana bridgesi | Bridges' Coast Range shoulderband | Shoulderband, Bridges' Coast Range | G02W | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta sequoicola consors | Redwood shoulderband | Shoulderband, redwood | G02X | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta traski coelata | Peninsular Range shoulderband | Shoulderband, Peninsular Range | G02Y | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Helminthoglypta walkeriana | Morro shoulderband (=Banded dune) snail | Snail, Morro shoulderband (=Banded dune) | G00D | I01 | CA; U.S.A. (CA) | Helminthoglyptida | Dec 15, 1994 | Snails | 8 | Endangered | 8 | US | I | Wherever found |
| Heloderma suspectum | Gila monster lizard | Lizard, gila monster | C03L | V01 | AZ, CA, NM, NV, UT; | Helodermatidae | NA | Reptiles | 2 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Heloderma suspectum | Gila monster lizard | Lizard, gila monster | C03L | V02 | UT; | Helodermatidae | NA | Reptiles | 6 | Not Listed | 6 | US | V | Utah DPS |
| Heloderma suspectum cinctum | Banded gila monster | Gila monster, banded | C05Q | V01 | AZ, CA, NV, UT; | Helodermatidae | NA | Reptiles | 1 | Not Listed | 2, 6, 8 | US | V | Wherever found |
| Helonias bullata | Swamp pink | Pink, swamp | Q2B8 | P01 | DE, GA, MD, NC, NJ, SC, VA; U.S.A. (VA, SC, NY, NJ, NC, MD, GA, DE) | Liliaceae | Sep 09, 1988 | Flowering Plants | 5 | Threatened | 4, 5 | US | P | Wherever found |
| Hemiargus ceraunus antibubastus | Ceraunus Blue Butterfly | Butterfly, ceraunus blue | I0W5 | I01 | U.S.A. (FL), Bahamas | Lycaenidae | Apr 06, 2012 | Insects | 4 | Similarity of Appearance to a Threatened Taxon | NA | US | I | Wherever found |
| Hemignathus affinis | Maui nukupuu | nukupuu, Maui | B0OC | V01 | HI; | Fringillidae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Hemignathus hanapepe | Kauai nukupuu | nukupuu, Kauai | B048 | V01 | HI; U.S.A. (HI) | Fringillidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Hemignathus wilsoni | akiapolaau | akiapolaau | B001 | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Hemileuca sp. | bog buckmoth | Buckmoth, bog | I0NM | I01 | NY, WI; | Saturniidae | NA | Insects | 5 | Not Listed | 3, 5 | US/Foreign | I | Wherever found |
| Hemipachnolia subporphyria subporphyria | Venus flytrap noctuid | Noctuid, Venus flytrap | I0PZ | I01 | NC; | Noctuidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hemiphaga novaeseelandiae chathamensis | Chatham Island pigeon | Pigeon, Chatham Island | B02Z | V01 | New Zealand | Columbidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hemistena lata | Cracking pearlymussel | Pearlymussel, cracking | F01X | I01 | AL, TN, VA; U.S.A. (VA, TN, OH, KY, IN, IL, AL) | Unionidae | Sep 28, 1989 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Hemistena lata | Cracking pearlymussel | Pearlymussel, cracking | F01X | I02 | U.S.A. (VA, TN, OH, KY, IN, IL, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Hemistena lata | Cracking pearlymussel | Pearlymussel, cracking | F01X | I03 | U.S.A. (VA, TN, OH, KY, IN, IL, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Hemitragus jayakari | Arabian tahr | Tahr, Arabian | A07T | V01 | Oman | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hemitremia flammea | Flame chub | Chub, flame | E08M | V01 | AL, GA, TN; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Hemitriccus kaempferi | Kaempfer's tody-tyrant | Tody-tyrant, Kaempfer's | B0BG | V01 | Brazil | Tyrannidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hemizonia arida | Red Rock tarweed | Tarweed, Red Rock | Q0YP | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia floribunda | Tecate tarweed | Tarweed, Tecate | Q0YR | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Hemizonia halliana | Hall's tarweed | Tarweed, Hall's | Q0YS | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia minthornii | Santa Susana tarweed | Tarweed, Santa Susana | Q0YT | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia mohavensis | Mojave tarweed | Tarweed, Mojave | Q0YU | P01 | CA; Possibly extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia multicaulis multicaulis | Seaside tarweed | Tarweed, seaside | Q2B9 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia multicaulis vernalis | Tiburon tarweed | Tarweed, Tiburon | Q2BA | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia parryi australis | Southern tarplant | Tarplant, southern | Q3DH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia parryi congdonii | Pappose spikeweed | Spikeweed, pappose | Q3DI | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemizonia pungens laevis | Smooth tarplant | Tarplant, smooth | Q3DJ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hemphillia burringtoni | Burrington jumping-slug | jumping-slug, Burrington | G0E7 | I01 | WA; | Arionidae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US | I | Wherever found |
| Hepialus sciophanes | [Unnamed] ghost moth | Ghost moth, [unnamed] | I0PI | I01 | NC, VA; | Hepialidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Heraclides andraemon bonhotei | Bahama swallowtail butterfly | Butterfly, Bahama swallowtail | I015 | I01 | FL; | Papilionidae | Apr 28, 1976 | Insects | 4 | Original Data in Error - Act Amendment | 4 | US/Foreign | I | Wherever found |
| Heraclides aristodemus ponceanus | Schaus swallowtail butterfly | Butterfly, Schaus swallowtail | I016 | I01 | FL; U.S.A. (FL) | Papilionidae | Apr 28, 1976 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Heritiera longipetiolata | Ufa-halomtano | Ufa-halomtano | Q2PA | P01 | GU, MP; | Sterculiaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hermidium alipes pallidum | No common name | No common name | Q0YV | P01 | CO, UT; | Nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Herpailurus (=Felis) yagouaroundi cacomitli | Gulf Coast jaguarundi | Jaguarundi, Gulf Coast | A05H | V01 | TX; U.S.A.(TX),Mexico | Felidae | Jun 14, 1976 | Mammals | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Herpailurus (=Felis) yagouaroundi fossata | Guatemalan jaguarundi | Jaguarundi, Guatemalan | A05I | V01 | Wherever found | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Mexico,Nicaragua |
| Herpailurus (=Felis) yagouaroundi panamensis | Panamanian jaguarundi | Jaguarundi, Panamanian | A05J | V01 | Panama,Nicaragua,Costa Rica | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Herpailurus (=Felis) yagouaroundi tolteca | Sinaloan Jaguarundi | Jaguarundi, Sinaloan | A05K | V01 | Felidae | Jun 14, 1976 | Mammals | 2 | Endangered | NA | US/Foreign | V | Wherever found | |
| Herricka horrida | No common name | No common name | Q3DK | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hesperapis oraria | Gulf Coast solitary bee | bee, Gulf Coast solitary | I0Z0 | I01 | Melittidae | NA | Insects | 4 | Not Listed | NA | US | I | Entire | |
| Hesperia comma ssp. | Spring Mountain comma skipper | Skipper, Spring Mountain comma | I0OH | I01 | NV; | Hesperiidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| hesperia comma ssp. mojavensis | Spring Mountains comma skipper butterfly | butterfly, Spring Mountains comma skipper | I0U7 | I01 | hesperiidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Hesperia dacotae | Dakota Skipper | Skipper, Dakota | I011 | I01 | IA, MN, ND, SD; | Hesperiidae | Nov 24, 2014 | Insects | 3 | Threatened | 3, 6 | US/Foreign | I | Wherever found |
| Hesperia leonardus montana | Pawnee montane skipper | Skipper, Pawnee montane | I01E | I01 | CO; U.S.A. (CO) | Hesperiidae | Sep 25, 1987 | Insects | 6 | Threatened | 6 | US | I | Wherever found |
| Hesperia mirimae ssp. | White Mountains skipper | Skipper, White Mountains | I0OI | I01 | CA, NV; | Hesperiidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hesperia uncas fulvapalla | Railroad Valley skipper | Skipper, Railroad Valley | I0VO | I01 | NV; U.S.A. (NV) | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Hesperia uncas giulianii | Mono Basin skipper | Skipper, Mono Basin | I0OF | I01 | CA; U.S.A. (CA) | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Hesperia uncas grandiosa | White River Valley skipper | Skipper, White River Valley | I0VQ | I01 | NV; U.S.A. (NV) | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Hesperia uncas reeseorum | Railroad Valley Skipper | Skipper, Railroad Valley | I0VP | I01 | NV; U.S.A. (NV) | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Hesperocnide sandwicensis | No common name | No common name | Q0YW | P01 | HI; | Urticaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hesperolinon adenophyllum | Glandular dwarf-flax | Dwarf-flax, glandular | Q0YX | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperolinon bicarpellatum | Two carpeled dwarf-flax | Dwarf-flax, two carpeled | Q0YY | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperolinon breweri | Brewer's dwarf-flax | Dwarf-flax, Brewer's | Q0YZ | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperolinon congestum | Marin dwarf-flax | Dwarf-flax, Marin | Q1X6 | P01 | CA; U.S.A. (CA) | Linaceae | Feb 03, 1995 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Hesperolinon didymocarpum | Lake County dwarf-flax | Dwarf-flax, Lake County | Q0Z0 | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperolinon drymarioides | Drymaria dwarf-flax | Dwarf-flax, Drymaria | Q0Z1 | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperolinon tehamense | Tehama dwarf-flax | Dwarf-flax, Tehama | Q341 | P01 | CA; | Linaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hesperomannia arborescens | No common name | No common name | Q1X7 | P01 | HI; U.S.A. (HI) | Asteraceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hesperomannia arbuscula | No common name | No common name | Q1X8 | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hesperomannia lydgatei | No common name | No common name | Q1X9 | P01 | HI; U.S.A. (HI) | Asteraceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hesperopsis gracielae | MacNeill sooty wing skipper | Skipper, MacNeill sooty wing | I0LX | I01 | AZ, CA, NV, UT; | Hesperiidae | NA | Insects | 1 | Not Listed | 2, 6, 8 | US | I | Wherever found |
| Heteramphus filicum | Oahu heteramphus fern weevil | Weevil, Oahu heteramphus fern | I0G7 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Heterelmis comalensis | Comal Springs riffle beetle | Beetle, Comal Springs riffle | I0MH | I01 | TX; U.S.A. (TX) | Elmidae | Dec 18, 1997 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| Heterelmis stephani | Stephan's Riffle beetle | Riffle beetle, Stephan's | I0CB | I01 | AZ; | Elmidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| heterocampa amanda | A Notodontid moth | moth, A Notodontid | I0UT | I01 | notodontidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Heterocleon berneri | Berner's two-winged mayfly | Mayfly, Berner's two-winged | I09O | I01 | GA; | Baetidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Heterodermia erinacea | No common name | No common name | Q3DL | P01 | CA; | Physciaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Heterodon simus | Southern hognose snake | Snake, southern hognose | C05J | V01 | AL, FL, GA, MS, NC, SC; | Colubridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Heteromeyenia longistylis | Pennsylvania sponge | Sponge, Pennsylvania | O005 | I01 | PA; | Spongillidae | NA | Sponges | 5 | Not Listed | 5 | US | I | Wherever found |
| Heterotheca jonesii | Jones golden aster | Golden aster, Jones | Q0Z2 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Heterotheca rutteri | No common name | No common name | Q3DM | P01 | AZ; Mexico (Sonora) | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Heuchera americana hispida | [Unnamed] alumroot | Alumroot, [unnamed] | Q0Z3 | P01 | VA, WV; | Saxifragaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Heuchera brevistaminea | Laguna alumroot | Alumroot, Laguna | Q0Z4 | P01 | CA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Heuchera duranii | Duran's alumroot | Alumroot, Duran's | Q0Z5 | P01 | CA, NV; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Heuchera hirsutissima | shaggyhair alumroot | alumroot, shaggyhair | Q3L1 | P01 | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Heuchera maxima | Island alumroot | Alumroot, island | Q2BB | P01 | CA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Heuchera missouriensis | No common name | No common name | Q0Z6 | P01 | MO; | Saxifragaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Heuchera villosa arkansana | No common name | No common name | Q0Z7 | P01 | AR; | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hexagenia sp | Burrowing mayfly | Mayfly, burrowing | I0SB | I01 | Ephemeroptera | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Hexalectris colemanii | Colemans coralroot | Coralroot, Colemans | Q3NB | P01 | AZ; | Orchidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hexalectris grandiflora | Greenman's hexalectris | Hexalectris, Greenman's | Q0Z8 | P01 | TX; | Orchidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hexalectris nitida | Glass Mountain coral-root | Coral-root, Glass Mountain | Q0Z9 | P01 | NM, TX; | Orchidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Hexalectris revoluta | Chisos coral-root | Coral-root, Chisos | Q0ZA | P01 | TX; | Orchidaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Hexalectris warnockii | Purple, Texas spike | Spike, purple, Texas | Q3DN | P01 | AZ, NM, TX; | Orchidaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hexastylis contracta | No common name | No common name | Q0ZB | P01 | KY, NC, TN; | Aristolochiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hexastylis lewisii | [Unnamed] heartleaf | Heartleaf, [unnamed] | Q0ZC | P01 | NC, VA; | Aristolochiaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Hexastylis naniflora | Dwarf-flowered heartleaf | Heartleaf, dwarf-flowered | Q1XA | P01 | NC, SC; U.S.A. (SC, NC) | Aristolochiaceae | Apr 14, 1989 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Hexastylis rhombiformis | French Broad heartleaf | Heartleaf, French Broad | Q342 | P01 | NC; | Aristolochiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hexastylis speciosa | Harper's heartleaf | Heartleaf, Harper's | Q0ZD | P01 | AL; | Aristolochiaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Hibiscadelphus bombycinus | No common name | No common name | Q1XC | P01 | HI; Believed to be extinct | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hibiscadelphus crucibracteatus | Hau kuahiwi | Hau kuahiwi | Q343 | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hibiscadelphus distans | Kauai hau kuahiwi | Kauai hau kuahiwi | Q1XB | P01 | HI; U.S.A. (HI) | Malvaceae | Apr 29, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscadelphus giffardianus | Hau kuahiwi | Hau kuahiwi | Q0ZE | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscadelphus hualalaiensis | Hau kuahiwi | Hau kuahiwi | Q0ZF | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscadelphus wilderanus | No common name | No common name | Q1XD | P01 | HI; Believed to be extinct | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hibiscadelphus woodii | Hau kuahiwi | Hau kuahiwi | Q3GL | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscus arnottianus ssp. immaculatus | Koki`o ke`oke`o | Koki`o ke`oke`o | Q2BC | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscus brackenridgei | (=Native yellow hibiscus) ma`o hau hele | Ma`o hau hele, (=native yellow hibiscus) | Q1XE | P01 | HI; U.S.A. (HI) | Malvaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscus californicus | California hibiscus | Hibiscus, California | Q0ZG | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hibiscus clayi | Clay's hibiscus | Hibiscus, Clay's | Q1XF | P01 | HI; U.S.A. (HI) | Malvaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscus dasycalyx | Neches River rose-mallow | Rose-mallow, Neches River | Q0ZH | P01 | TX; | Malvaceae | Oct 11, 2013 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Hibiscus kokio | Pualoalo | Pualoalo | Q0ZI | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hibiscus waimeae ssp. hannerae | Koki`o ke`oke`o | Koki`o ke`oke`o | Q1XG | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Hibiscus waimeae waimeae | No common name | No common name | Q1XH | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| hieracium fendleri | Mogollon hawkweed | hawkweed, Mogollon | Q3MP | P01 | Asteraceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Hieracium longiberbe | No common name | No common name | Q0ZJ | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hieracium pringlei | Pringle hawkweed | Hawkweed, Pringle | Q3DO | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hieracium robinsonii | [Unnamed] hawkweed | Hawkweed, [unnamed] | Q344 | P01 | ME, NH; Canada (Nfld,N.S,Que.) | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| Himantopus mexicanus knudseni | Hawaiian stilt | Stilt, Hawaiian | B04C | V01 | HI; | Recurvirostridae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Himantopus novaezelandiae | Black Stilt | Stilt, black | B0CS | V01 | New Zealand | Charadriidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hippocamelus antisensis | North Andean huemul | Huemul, north Andean | A05F | V01 | Wherever found | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hippocamelus bisulcus | South Andean huemul | Huemul, south Andean | A05G | V01 | Wherever found | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hipposideros lamottei | Lamotte's Roundleaf Bat | Bat, Lamotte's Roundleaf | A0JS | V01 | Rhinolophidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Hipposideros ridleyi | Singapore roundleaf horseshoe bat | Bat, Singapore roundleaf horseshoe | A09Z | V01 | Entire | Hipposideridae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hippotragus niger variani | Giant sable antelope | Antelope, giant sable | A00I | V01 | Entire | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Histrionicus histrionicus | Harlequin duck | Duck, harlequin | B093 | V01 | AK, AR, AZ, CA, CO, CT, DE, IA, ID, KS, MA, MD, ME, MN, MO, MT, NE, NH, NJ, NM, NV, OK, OR, RI, SD, TX, UT, WA, WY; | Anatidae | NA | Birds | 6 | Not Listed | 1, 2, 3, 4, 5, 6, 7, 8 | US/Foreign | V | Wherever found |
| Hobbseus cristatus | Crested Riverlet crayfish | crayfish, Crested Riverlet | K06U | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Hobbseus orconectoides | Oktibbeha rivulet crayfish | Crayfish, Oktibbeha rivulet | K02Z | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Hobbseus petilus | Tombigbee Riverlet crayfish | crayfish, Tombigbee Riverlet | K06V | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Hobbseus yalobushensis | Yalobusha Riverlet crayfish | crayfish, Yalobusha Riverlet | K06W | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Hoffmannseggia tenella | Slender rush-pea | Rush-pea, slender | Q1XI | P01 | TX; U.S.A. (TX) | Fabaceae | Nov 01, 1985 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| hoita strobilina | Loma Prieta hoita | hoita, Loma Prieta | Q3KD | P01 | fabaceae | NA | Flowering Plants | 8 | Not Listed | NA | US | P | Wherever found | |
| Holbrookia lacerata | Spot-tailed earless lizard | Lizard, spot-tailed earless | C073 | V01 | TX; U.S.A. (OK, TX), Mexico | Phrynosomatidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | V | Wherever found |
| Holcobius pikoensis | Piko anobiid beetle | Anobiid beetle, Piko | I024 | I01 | HI; | Anobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Holcopasites ruthae | Riverside cuckoo bee | Bee, Riverside cuckoo | I0RY | I01 | Anthophoridae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Hollisteria lanata | Hollisteria | Hollisteria | Q345 | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Holmgrenanthe petrophila | Rock lady | Rock lady | Q0ZK | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Holocarpha macradenia | Santa Cruz tarplant | Tarplant, Santa Cruz | Q0ZL | P01 | CA; U.S.A. (CA) | Asteraceae | Mar 20, 2000 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Holocarpha virgata elongata | No common name | No common name | Q3DP | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| holospira animasensis | animas mountains tubeshell | No common name | G0DQ | I01 | urocoptidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Homoeoneuria cahabensis | Cahaba sandfiltering mayfly | Mayfly, Cahaba sandfiltering | I09Q | I01 | AL, MS; | Oligoneuridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Homoeoneuria dolani | Blackwater sandfiltering mayfly | Mayfly, Blackwater sandfiltering | I09P | I01 | FL, GA, SC; | Oligoneuridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Homoplectra schuhi | Schuh's homoplectran caddisfly | Caddisfly, Schuh's homoplectran | I04A | I01 | OR; | Hydropsychidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| hordeum intercedens | Vernal barley | barley, Vernal | Q3JW | P01 | poaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Horkelia bolanderi | Bolander's horkelia | Horkelia, Bolander's | Q3DQ | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia congesta ssp. congesta | shaggy horkelia | horkelia, shaggy | Q3DR | P01 | OR; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Horkelia cuneata sericea | Wedge-leaved horkelia | Horkelia, wedge-leaved | Q346 | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia hendersonii | Henderson's horkelia | Horkelia, Henderson's | Q2BD | P01 | CA, OR; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Horkelia marinensis | Point Reyes horkelia | Horkelia, Point Reyes | Q347 | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia parryi | Parry's horkelia | Horkelia, Parry's | Q348 | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia truncata | Ramona cinquuefoil | Cinquuefoil, Ramona | Q2BE | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia tularensis | Tulare horkelia | Horkelia, Tulare | Q2BF | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horkelia wilderae | Barton Flats horkelia | Horkelia, Barton Flats | Q0ZM | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Horologion speokites | Arbuckle Cave ground beetle | Ground beetle, Arbuckle Cave | I0L2 | I01 | WV; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Houstonia caerulea faxonorum | Alpine bluet | Bluet, Alpine | Q2U4 | P01 | NH; | Rubiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Howellia aquatilis | Water howellia | Howellia, water | Q2RM | P01 | CA, ID, MT, OR, WA; U.S.A. (WA, OR, MT, ID, CA) | Campanulaceae | Jul 14, 1994 | Flowering Plants | 6 | Threatened | 1, 6, 8 | US | P | Wherever found |
| Howelliella ovata | Oval-leaved snapdragon | Snapdragon, oval-leaved | Q2YP | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hudsonia montana | Mountain golden heather | Heather, mountain golden | Q2U5 | P01 | NC; U.S.A. (NC) | Cistaceae | Oct 20, 1980 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Huleechius marroni carolus | Marron's San Carlos riffle beetle | Riffle beetle, Marron's San Carlos | I0CC | I01 | AZ; | Elmidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Hulsea californica | Laguna Mountains sunflower | Sunflower, Laguna Mountains | Q2BG | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hulsea vestita inyoensis | Inyo hulsea | Hulsea, Inyo | Q0ZN | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Hulsea vestita ssp. callicarpha | Beautiful Hulsea | Hulsea, Beautiful | Q3L9 | P01 | CA; | Asteraceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Huperzia acerosa | [Unnamed] clubmoss | Clubmoss, [unnamed] | S00D | P01 | PR, VI; | Lycopodiaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Huperzia haleakalae | No common name | No common name | S00C | P01 | HI; Believed to be extinct | Lycopodiaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Huperzia mannii | Wawae`iole | Wawae`iole | S01K | P01 | HI; U.S.A. (HI) | Lycopodiaceae | May 15, 1992 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Huperzia nutans | Wawae`iole | Wawae`iole | S01L | P01 | HI; | Lycopodiaceae | Mar 28, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Huperzia stemmermanniae | No common name | No common name | S02B | P01 | HI; | Lycopodiaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Huso dauricus | Kaluga sturgeon | sturgeon, Kaluga | E0CK | V01 | Acipenseridae | Sep 04, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Huso huso | Beluga sturgeon | Sturgeon, Beluga | E0A2 | V01 | Azerbaijan, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Georgia, Hungary, Islamic Republic of Iran, Italy, Kazakhstan, Republic of Moldova, Romania, Russian Federation, Serbia and Montenegro, Turkey, Turkmenistan, Ukraine | Acipenseridae | Apr 21, 2004 | Fishes | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Hyaena hyaena barbara | Barbary hyena | Hyena, Barbary | A01A | V01 | Wherever found | Hyaenidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hyalella texana | Clear Creek Amphipod | Amphipod, Clear Creek | K07P | I01 | Hyalellidae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Hybognathus amarus | Rio Grande Silvery Minnow | Minnow, Rio Grande Silvery | E07I | V01 | NM, TX; Rio Grande downstream of Cochiti Dam to the inflow of Elephant Butte Reservoir.; U.S.A. (TX, NM), Mexico | Cyprinidae | Jul 20, 1994 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found, except where listed as an experimental population |
| Hybognathus amarus | Rio Grande Silvery Minnow | Minnow, Rio Grande Silvery | E07I | V02 | TX; U.S.A. (TX, NM), Mexico | Cyprinidae | Dec 08, 2008 | Fishes | 2 | Experimental Population, Non-Essential | 2 | US | V | Rio Grande, from Little Box Canyon (approximately 10.4 river miles downstream of Fort Quitman, TX) to Amistad Dam; and on the Pecos River, from its confluence with Independence Creek to its confluence with the Rio Grande |
| Hybognathus argyritis | Western silvery minnow | Minnow, western silvery | E09C | V01 | IA, IL, KS, MO, MT, ND, NE, SD, WY; | Cyprinidae | NA | Fishes | 6 | Not Listed | 3, 6 | US/Foreign | V | Wherever found |
| Hybognathus placitus | Plains minnow | Minnow, Plains | E09B | V01 | AR, CO, IA, IL, KS, KY, LA, MO, MT, ND, NE, NM, OK, SD, TX, WY; | Cyprinidae | NA | Fishes | 6 | Not Listed | 2, 3, 4, 6 | US | V | Wherever found |
| Hybopsis lineapunctata | Lined chub | Chub, lined | E073 | V01 | AL, GA, TN; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Hydraena maureenae | Maureen's hydraenan minute moss beetle | Minute moss beetle, Maureen's hydraenan | I0AB | I01 | VA; | Hydraenidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Hydrastis canadensis | Goldenseal | Goldenseal | Q0ZO | P01 | AL, AR, CT, DE, GA, IA, IL, IN, KY, MD, MI, MN, MO, MS, NC, NY, OH, PA, TN, VA, VT, WI, WV; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Hydrochara rickseckeri | Ricksecker's water scavenger beetle | Water scavenger beetle, Ricksecker's | I0FE | I01 | CA; | Hydrophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hydrochus sp. | Seth Forest water scavenger beetle | Water scavenger beetle, Seth Forest | I0MA | I01 | MD; | Hydrophilidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Hydromantes brunus | Limestone salamander | Salamander, limestone | D01B | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Hydromantes platycephalus | Mount Lyell salamander | Salamander, Mount Lyell | D01Y | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Hydromantes shastae | Shasta salamander | Salamander, Shasta | D01I | V01 | CA; | Plethodontidae | NA | Amphibians | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Hydromantes sp. | Owens Valley web-toes salamander | Salamander, Owens Valley web-toes | D02U | V01 | CA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Hydrophyllum capitatum thompsonii | Ballhead, Thompson's waterleaf | Waterleaf, ballhead, Thompson's | Q2BH | P01 | OR, WA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hydroporus elusivus | Elusive hydroporus diving beetle | Diving beetle, elusive hydroporus | I06B | I01 | NH; Possibly extinct,not reported since 1965 | Dytiscidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Hydroporus folkertsi | Folkerts' hydroporus diving beetle | Diving beetle, Folkerts' hydroporus | I06C | I01 | AL; | Dytiscidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroporus hirsutus | Wooly hydroporus diving beetle | Diving beetle, wooly hydroporus | I06D | I01 | CA; | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hydroporus leechi | Leech's skyline diving beetle | Diving beetle, Leech's skyline | I06E | I01 | CA; | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hydroporus simplex | Simple hydroporus diving beetle | Diving beetle, simple hydroporus | I06F | I01 | CA; | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hydroporus spangleri | Spangler's hydroporus diving beetle | Diving beetle, Spangler's hydroporus | I06G | I01 | UT; | Dytiscidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Hydroporus sulphurius | Sulphur Springs hydroporus diving beetle | Diving beetle, Sulphur Springs hydroporus | I06H | I01 | AR; Possibly extinct,not reported since 1965 | Dytiscidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroporus utahensis | Utah hydroporus diving beetle | Diving beetle, Utah hydroporus | I06I | I01 | UT; | Dytiscidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Hydropsyche reiseni | Reisen's hydropsyche caddisfly | Caddisfly, Reisen's hydropsyche | I048 | I01 | OK; | Hydropsychidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Hydroptila chelops | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NN | I01 | AL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila decia | Knoxville hydroptilan micro caddisfly | Micro caddisfly, Knoxville hydroptilan | I0A8 | I01 | TN; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila englishi | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NO | I01 | NC, SC; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila lagoi | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NP | I01 | AL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila okaloosa | Rogue Creek hydroptila caddisfly | Caddisfly, Rogue Creek hydroptila | I0W8 | I01 | FL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila ouachita | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0NQ | I01 | LA; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila sarahae | Sarah's hydroptila caddisfly | Caddisfly, Sarah's hydroptila | I0W7 | I01 | FL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Hydroptila sykorai | Sykora's Hydroptila caddisfly | caddisfly, Sykora's Hydroptila | I0WT | I01 | FL; | Hydroptilidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Hygrotus artus | Mono Lake hygrotus diving beetle | Diving beetle, Mono Lake hygrotus | I06N | I01 | CA; Believed to be extinct | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hygrotus curvipes | Curved-foot hygrotus diving beetle | Diving beetle, curved-foot hygrotus | I06J | I01 | CA; | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hygrotus diversipes | Narrow-foot hygrotus diving beetle | Diving beetle, narrow-foot hygrotus | I06K | I01 | WY; | Dytiscidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Hygrotus fontinalis | Travertine band-thigh diving beetle | Diving beetle, travertine band-thigh | I06L | I01 | CA; | Dytiscidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Hygrotus sylvanus | Sylvan hygrotus diving beetle | Diving beetle, sylvan hygrotus | I06M | I01 | MA, MN, NY; | Dytiscidae | NA | Insects | 3 | Not Listed | 3, 5 | US | I | Wherever found |
| Hyla andersonii | Pine barrens treefrog | Treefrog, pine barrens | D00N | V01 | FL; | Hylidae | Dec 18, 1977 | Amphibians | 4 | Original Data in Error - New Information Discovered | 4 | US | V | Florida |
| Hyla wrightorum | Arizona Treefrog | Treefrog, Arizona | D03S | V02 | AZ; | Hylidae | NA | Amphibians | 2 | Not Listed | 2 | US/Foreign | V | Huachuca/Canelo Population |
| Hylaeus andrenoides | Andrenoid yellow-faced bee | Yellow-faced bee, andrenoid | I0GN | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus angustula | Lanai yellow-faced bee | Yellow-faced bee, Lanai | I0HO | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus anomala | Anomalous yellow-faced bee | Yellow-faced bee, anomalous | I0GO | I01 | HI; | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus anthracinus | Anthricinan yellow-faced bee | Yellow-faced bee, anthricinan | I0GP | I01 | HI; Possibly extinct, not reported since 1965; Possibly extinct, not reported since 1965.; Possibly extinct,not reported since 1965 | Hylaeidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus assimulans | Assimulans yellow-faced bee | Yellow-faced bee, assimulans | I0GQ | I01 | HI; Possibly extinct, not reported since 1965.; Possibly extinct,not reported since 1965 | Hylaeidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus blackburni | Blackburn's yellow-faced bee | Yellow-faced bee, Blackburn's | I0HP | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus caeruleipennis | Bluewing yellow-faced bee | Yellow-faced bee, bluewing | I0GR | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus chlorosticata | Chlorostictan yellow-faced bee | Yellow-faced bee, chlorostictan | I0GS | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus communis | Comes yellow-faced bee | Yellow-faced bee, comes | I0GT | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus coniceps | Conehead yellow-faced bee | Yellow-faced bee, conehead | I0GU | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus connectens | Connected yellow-faced bee | Yellow-faced bee, connected | I0HQ | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus crabronoides | Crabronoid yellow-faced bee | Yellow-faced bee, crabronoid | I0GV | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus difficilis | Difficult yellow-faced bee | Yellow-faced bee, difficult | I0GW | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus dimidiatus | Dimidiatan yellow-faced bee | Yellow-faced bee, dimidiatan | I0GX | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus erythrodemas | Erythrodeme yellow-faced bee | Yellow-faced bee, erythrodeme | I0HR | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus facilis | Easy yellow-faced bee | Yellow-faced bee, easy | I0GY | I01 | HI; Possibly extinct, not reported since 1965.; Possibly extinct,not reported since 1965 | Hylaeidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus filicum | Fern yellow-faced bee | Yellow-faced bee, Fern | I0GZ | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus finitima | Finitiman yellow-faced bee | Yellow-faced bee, finitiman | I0HS | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus flavifrons | Very yellow-faced bee | Yellow-faced bee, very | I0H0 | I01 | HI; | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus flavipes | Yellow-foot yellow-faced bee | Yellow-faced bee, yellow-foot | I0H1 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus fuscipennis | Darkwing yellow-faced bee | Yellow-faced bee, darkwing | I0H2 | I01 | HI; | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus haleakalae | Haleakala yellow-faced bee | Yellow-faced bee, Haleakala | I0H3 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus hilaris | Hilaris yellow-faced bee | Yellow-faced bee, hilaris | I0HT | I01 | HI; Believed to be extinct; Believed to be extinct. | Hylaeidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus hirsutulus | Hirsute yellow-faced bee | Yellow-faced bee, hirsute | I0H4 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus hostilis | Hostile yellow-faced bee | Yellow-faced bee, hostile | I0H5 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus hula | Hulan yellow-faced bee | Yellow-faced bee, hulan | I0H6 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus insignis | Insignis yellow-faced bee | Yellow-faced bee, insignis | I0H7 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus kauaiensis | Kauai yellow-faced bee | Yellow-faced bee, Kauai | I0H8 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus koae | Koa yellow-faced bee | Yellow-faced bee, Koa | I0H9 | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus kona | Kona yellow-faced bee | Yellow-faced bee, Kona | I0HA | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus kuakea | Hawaiian yellow-faced bee | yellow-faced bee, Hawaiian | I0VM | I01 | HI; | Colletidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus laeta | Laetan yellow-faced bee | Yellow-faced bee, Laetan | I0HB | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus laticeps | Broadhead yellow-faced bee | Yellow-faced bee, broadhead | I0HU | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus longiceps | Hawaiian yellow-faced bee | yellow-faced bee, Hawaiian | I0HC | I01 | HI; Possibly extinct, not reported since 1965.; Possibly extinct,not reported since 1965 | Hylaeidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus mana | Hawaiian yellow-faced bee | yellow-faced bee, Hawaiian | I0VL | I01 | HI; | Colletidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hylaeus obscurata | Obscuratan yellow-faced bee | Yellow-faced bee, obscuratan | I0HD | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus ombrias | Ombrias yellow-faced bee | Yellow-faced bee, Ombrias | I0HE | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus perkinsianus | Perkin's yellow-faced bee | Yellow-faced bee, Perkin's | I0HF | I01 | HI; | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus perspicuus | Perspicuan yellow-faced bee | Yellow-faced bee, perspicuan | I0HV | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus psammobia | Psammobian yellow-faced bee | Yellow-faced bee, psammobian | I0HW | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus pubescens | Furry yellow-faced bee | Yellow-faced bee, furry | I0HG | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus satellus | Satellus yellow-faced bee | Yellow-faced bee, satellus | I0HH | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus simplex | Simple yellow-faced bee | Yellow-faced bee, simple | I0HI | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus specularis | Specular yellow-faced bee | Yellow-faced bee, specular | I0HJ | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus sphecodoides | Sphecodoid yellow-faced bee | Yellow-faced bee, sphecodoid | I0HK | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus unica | Unique yellow-faced bee | Yellow-faced bee, unique | I0HL | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus vicina | Vicinan yellow-faced bee | Yellow-faced bee, vicinan | I0HM | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylaeus volatilis | Volatile yellow-faced bee | Yellow-faced bee, volatile | I0HN | I01 | HI; Possibly extinct,not reported since 1965 | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hylobates spp. (including Nomascus) | Gibbons | Gibbons | A05A | V01 | China,India,Southeast Asia; Wherever found | Pongidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hymenocallis coronaria | Shoals spider-lily | Spider-lily, shoals | Q0ZP | P01 | AL, GA, SC; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hymenocallis godfreyi | Godfrey's spiderlily | Spiderlily, Godfrey's | Q3ML | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hymenocallis henryae | Henry's spider-lily | spider-lily, Henry's | Q349 | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Hymenocallis latifolia | No common name | No common name | Q0ZQ | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hymenoclea sandersonii | Sanderson's Cheesebush | Cheesebush Sanderson's | Q3M3 | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Hymenopappus filifolius idahoensis | No common name | No common name | Q0ZR | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Hymenopappus filifolius tomentosus | Cobweb hymenopappus | Hymenopappus, cobweb | Q0ZS | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hymenophyllum tayloriae | gorge filmy fern | fern, gorge filmy | S02J | P01 | NC; | Hymenophyllaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Hymenophyllum tunbrigense | Tunbridge fern | Fern, Tunbridge | S014 | P01 | SC; Europe,West Indies,Spain (Canary Islands) | Hymenophyllaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Hymenophysa curta | Ayumodoki (loach) | Ayumodoki (loach) | E00J | V01 | Japan | Cobitidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hymenoxys ambigens var. floribunda | Apache Pass rubberweed | Rubberweed, Apache Pass | Q1I8 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hymenoxys helenioides | No common name | No common name | Q34A | P01 | AZ, CO, NM, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Hymenoxys herbacea | Lakeside daisy | Daisy, Lakeside | Q2U6 | P01 | IL, MI, OH; Canada (Ont.); U.S.A. (OH, MI, IL), Canada (Ont.) | Asteraceae | Jun 23, 1988 | Flowering Plants | 3 | Threatened | 3 | US/Foreign | P | Wherever found |
| Hymenoxys lapidicola | No common name | No common name | Q34B | P01 | CO, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Hymenoxys quinquesquamata | No common name | No common name | Q0ZT | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hymenoxys subintegra | No common name | No common name | Q0ZU | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Hymenoxys texana | Texas prairie dawn-flower | Dawn-flower, Texas prairie | Q2RK | P01 | TX; U.S.A. (TX) | Asteraceae | Mar 13, 1986 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Hypena laysanensis | Laysan dropseed noctuid moth | Moth, Laysan dropseed noctuid | I0B2 | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hypena newelli | Hilo hypenan noctuid moth | Moth, Hilo hypenan noctuid | I0AV | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hypena plagiota | Lovegrass noctuid moth | Moth, lovegrass noctuid | I0B4 | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hypena senicula | Kaholuamano noctuid moth | Moth, Kaholuamano noctuid | I0AW | I01 | HI; Believed to be extinct | Noctuidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hypericum adpressum | No common name | No common name | Q3DS | P01 | AL, CT, DE, GA, IL, IN, KY, MA, MD, NJ, NY, PA, RI, SC, TN, VA; | Hypericaceae | NA | Flowering Plants | 5 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Hypericum cumulicola | Highlands scrub hypericum | Hypericum, highlands scrub | Q1XJ | P01 | FL; U.S.A. (FL) | Hypericaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Hypericum dolabriforme | No common name | No common name | Q34C | P01 | AL, GA, IN, KY, OH, TN; | Hypericaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Hypericum edisonianum | Edison's ascyrum | Ascyrum, Edison's | Q0ZV | P01 | FL; | Hypericaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Hypericum lissophloeus | Smooth barked St. John’s wort | St John's wort, Smooth barked | Q2BL | P01 | FL; | Hypericaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Hypericum radfordiorum | Radford's St. John's Wort | St. John's Wort, Radford's | Q3SK | P01 | NC; | Clusiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Hypericum sp. 1 | Radford's St. John's Wort | St. John's Wort, Radford's | Q0ZW | P01 | AL, GA, KY, TN; | Hypericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Hypolepis hawaiiensis var. mauiensis | olua | olua | S02Q | P01 | HI; ; Hypolepis hawaiiensis var. mauiensis is historically known from Puu Kukui on the island of Maui, in mesic and wet forest (Palmer 2003, pp. 168−170). | Dennstaedtiaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Hypolimnas octocula marianensis | Mariana eight-spot butterfly | Butterfly, Mariana eight-spot | I0R7 | I01 | GU; | Nymphalidae | Nov 02, 2015 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Hypomesus transpacificus | Delta smelt | Smelt, delta | E070 | V01 | CA; Delta smelt are found within the defined "legal" delta of the Sacramento and San Joaquin Rivers and the waterways of the Suisun Marsh Complex. Their range extends east of the Carquinez Bridge near Vallejo, south of the I Street Bridge in Sacramento and north of the convergence of the Stanislaus and San Joaquin Rivers; U.S.A. (CA) | Osmeridae | Mar 05, 1993 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Hyposmocoma neckerensis | Necker petrochroan leaf miner | Leaf miner, Necker petrochroan | I080 | I01 | HI; Possibly extinct,not reported since 1965 | Gracilariidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Hypotrachyna virginica | Flaky square britches | britches, Flaky square | U00Z | P01 | NC; | Parmeliaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Hypoxis sessilis | [Unnamed] star-grass | Star-grass, [unnamed] | Q0ZX | P01 | AR, LA, OK, TX, VA; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4, 5 | US | P | Wherever found |
| Hypsipetes borbonicus olivaceus | Mauritius olivaceous Bulbul | Bulbul, Mauritius olivaceous | B011 | V01 | Indian Ocean—Mauritius | Pycnonotidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Hysterocarpus traskii pomo | Russian River tule perch | Tule perch, Russian River | E085 | V01 | CA; | Embiotocidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Icaricia (Plebejus) shasta charlestonensis | Mount Charleston blue butterfly | Butterfly, Mount Charleston blue | I0TX | I01 | NV; ; U.S.A. (NV) | Lycaenidae | Oct 21, 2013 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Icaricia icariodes ssp. | Point Reyes blue | Blue, Point Reyes | I0MU | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Icaricia icarioides fenderi | Fender's blue butterfly | Butterfly, Fender's blue | I0IS | I01 | OR; U.S.A. (OR) | Lycaenidae | Jan 25, 2000 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Icaricia icarioides missionensis | Mission blue butterfly | Butterfly, mission blue | I00J | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Icaricia icarioides moroensis | Morro Bay blue butterfly | butterfly, Morro Bay blue | I001 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Icaricia icarioides pheres | Pheres blue | Blue, Pheres | I002 | I01 | CA; Believed to be extinct | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ictalurus lupus | Headwater catfish | Catfish, headwater | E02G | V01 | NM, TX; | Ictaluridae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Ictalurus pricei | Yaqui catfish | Catfish, Yaqui | E02H | V01 | AZ; U.S.A. (AZ), Mexico | Ictaluridae | Aug 31, 1984 | Fishes | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Ictalurus sp. | Chihuahua catfish | Catfish, Chihuahua | E08K | V01 | NM, TX; | Ictaluridae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | V | Wherever found |
| ictalurus species | No common name | No common name | E0B2 | V01 | ictaluridae | NA | Fishes | 2 | Not Listed | NA | US | V | Wherever found | |
| icteria virens | Yellow-breasted chat | chat, Yellow-breasted | B0ET | V01 | fringillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Icterus cucullatus cucullatus | Mexican hooded oriole | Oriole, Mexican hooded | B08J | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Icterus cucullatus sennetti | Sennett's hooded oriole | Oriole, Sennett's hooded | B08K | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Icterus graduacauda audubonii | Audubon's oriole | Oriole, Audubon's | B08I | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Idia gopheri | Tortoise commensal noctuid moth | Noctuid moth, tortoise commensal | I0NX | I01 | FL; | Noctuidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Idionycteris phyllotis | Allen's big-eared bat | Bat, Allen's big-eared | A0GQ | V01 | AZ, CA, CO, NM, NV, UT; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Idiostatus kathleenae | Pinnacles shield-back katydid | Katydid, Pinnacles shield-back | I0L9 | I01 | CA; | Tettigoniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Idiostatus middlekaufi | Middlekauf's shieldback katydid | Katydid, Middlekauf's shieldback | I01U | I01 | CA; | Tettigoniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ilex amelanchier | [Unnamed] holly | Holly, [unnamed] | Q2BM | P01 | AL, FL, GA, LA, MS, NC, SC; | Aquifoliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ilex collina | Long-stalked holly | Holly, long-stalked | Q2BN | P01 | NC, VA, WV; | Aquifoliaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Ilex cookii | Cook's holly | Holly, Cook's | Q2BO | P01 | PR; Endemic to Puerto Rico. Known from Toro Negro Commonwealth Forest; U.S.A. (PR) | Aquifoliaceae | Jun 16, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Ilex opaca arenicola | No common name | No common name | Q0ZY | P01 | FL; | Aquifoliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ilex sintenisii | No common name | No common name | Q3AB | P01 | PR; Endemic to Puerto Rico. Known from the El Yunque National Forest; U.S.A. (PR) | Aquifoliaceae | Apr 22, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Iliamna corei | Peter's Mountain mallow | Mallow, Peter's Mountain | Q2BP | P01 | VA; U.S.A. (VA) | Malvaceae | May 12, 1986 | Flowering Plants | 5 | Endangered | 5 | US | P | Wherever found |
| Iliamna remota | Kankakee globe-mallow | Globe-mallow, Kankakee | Q0ZZ | P01 | IL, IN, VA; | Malvaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Illicium parviflorum | Yellow anisetree | anisetree, Yellow | Q100 | P01 | FL, GA; | Illiciaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Incisalia lanoraieensis | Bog elfin butterfly | Butterfly, bog elfin | I006 | I01 | ME, NH, NY; | Lycaenidae | NA | Insects | 5 | Not Listed | 5 | US/Foreign | I | Wherever found |
| Incisalia mossi doudoroffi | Wind's elfin butterfly | Butterfly, Wind's elfin | I00T | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Incisalia mossi windi | Doudoroff's elfin butterfly | Butterfly, Doudoroff's elfin | I00B | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Incisalia mossii ssp. | San Gabriel Mountains elfin | Elfin, San Gabriel Mountains | I0P6 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | San Gabriel |
| Incisalia mossii ssp. | Marin elfin | Elfin, Marin | I0P7 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Marin |
| Indigofera mucronata var. keyensis | Florida indigo | Indigo, Florida | Q3DT | P01 | FL; Florida Keys | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Indri indri | Indri lemur | lemur, Indri | A01F | V01 | Wherever found | Indridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Inflectarius magazinensis | Magazine Mountain shagreen | Shagreen, Magazine Mountain | G00K | I01 | AR; U.S.A. (AR) | Polygyridae | Apr 17, 1989 | Snails | 4 | Recovery | 4 | US | I | Wherever found |
| Io fluvialis | Spiny riversnail | Riversnail, spiny | G017 | I01 | VA; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| ionactis caelestis | Red Rock Canyon aster | aster, Red Rock Canyon | Q3JH | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Ionactis elegans | No common name | No common name | Q2O3 | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Iotichthys phlegethontis | Least chub | Chub, least | E02U | V01 | UT; | Cyprinidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Wherever found |
| Ipomoea cairica lineariloba | No common name | No common name | Q2BQ | P01 | HI; | Convolvulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ipomoea cardiophylla | No common name | No common name | Q2BR | P01 | TX; | Convolvulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ipomoea krugii | Krug's white morning-glory | Morning-glory, Krug's white | Q102 | P01 | PR, VI; | Convolvulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ipomoea plummerae | [Unnamed] morning-glory | Morning-glory, [unnamed] | Q101 | P01 | AZ, NM; | Convolvulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ipomoea tenuiloba lemmonii | Lemmon's morning-glory | Morning-glory, Lemmon's | Q103 | P01 | AZ; | Convolvulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ipomopsis aggregata webberi | No common name | No common name | Q3DU | P01 | WY; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ipomopsis globularis | No common name | No common name | Q104 | P01 | CO; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ipomopsis polyantha | Pagosa skyrocket | Skyrocket, Pagosa | Q2U7 | P01 | CO; U.S.A. (CO) | Polemoniaceae | Aug 26, 2011 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Ipomopsis sancti-spiritus | Holy Ghost ipomopsis | Ipomopsis, Holy Ghost | Q34D | P01 | NM; U.S.A. (NM) | Polemoniaceae | Mar 23, 1994 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Ipomopsis spicata robruthii | No common name | No common name | Q3DV | P01 | WY; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Iris lacustris | Dwarf lake iris | Iris, dwarf lake | Q2BS | P01 | MI, WI; Canada (Ont.); U.S.A. (WI, MI), Canada (Ont.) | Iridaceae | Sep 28, 1988 | Flowering Plants | 3 | Threatened | 3 | US/Foreign | P | Wherever found |
| Iris missouriensis | [Unnamed] iris | Iris, [unnamed] | Q34E | P01 | UT; Possibly extinct | Iridaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Iris tenax gormanii | [Unnamed] iris | Iris, [unnamed] | Q105 | P01 | OR; | Iridaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Iris tenax klamathensis | Klamath iris | Iris, Klamath | Q106 | P01 | CA; | Iridaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Iris tenuis | Clackamas iris | Iris, Clackamas | Q107 | P01 | OR; | Iridaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ironoquia plattensis | Platte River caddisfly | caddisfly, Platte River | I0V7 | I01 | NE; | Limnephilidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Ischaemum byrone | Hilo ischaemum | Ischaemum, Hilo | Q2BT | P01 | HI; U.S.A. (HI) | Poaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Ischnura gemina | San Francisco forktail damselfly | Damselfly, San Francisco forktail | I066 | I01 | CA; | Coenagrionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ischnura luta | Rota blue damselfly | damselfly, Rota blue | I0U8 | I01 | MP; | coenagrionidae | Nov 02, 2015 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Islandiana speophila | Cavern sheet-web spider | Spider, cavern sheet-web | J00S | I01 | WV; | Lymphiidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Isocoma arguta | Goldenbush | Goldenbush | Q3DW | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Isodendrion hosakae | Aupaka | Aupaka | Q2BU | P01 | HI; U.S.A. (HI) | Violaceae | Jan 14, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Isodendrion laurifolium | Aupaka | Aupaka | Q108 | P01 | HI; U.S.A. (HI) | Violaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Isodendrion longifolium | Aupaka | Aupaka | Q109 | P01 | HI; U.S.A. (HI) | Violaceae | Oct 10, 1996 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Isodendrion pyrifolium | Kula wahine noho | Kula wahine noho | Q1XK | P01 | HI; U.S.A. (HI) | Violaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Isoetes bolanderi pygmaea | Pygmy quillwort | Quillwort, pygmy | S016 | P01 | CA; | Isoetaceae | NA | Ferns and Allies | 1 | Not Listed | 8 | US | P | Wherever found |
| Isoetes eatonii | Eaton's quillwort | Quillwort, Eaton's | S008 | P01 | CT, DE, MA, NH, NJ, NY; Canada (Ont.) | Isoetaceae | NA | Ferns and Allies | 5 | Not Listed | 5 | US | P | Wherever found |
| Isoetes flaccida | [Unnamed] quillwort | Quillwort, [unnamed] | S017 | P01 | FL, GA; | Isoetaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Isoetes foveolata | Pitted quillwort | Quillwort, pitted | S009 | P01 | CT, MA, NH; | Isoetaceae | NA | Ferns and Allies | 5 | Not Listed | 5 | US | P | Wherever found |
| Isoetes hyemalis | Winter quillwort | quillwort, Winter | S02R | P01 | AL, FL, GA, NC, SC, VA; | Isoetaceae | NA | Ferns and Allies | 4 | Not Listed | 4, 5 | US | P | Entire |
| Isoetes lithophila | Rock quillwort | Quillwort, rock | S00A | P01 | TX; | Isoetaceae | NA | Ferns and Allies | 2 | Not Listed | 2 | US | P | Wherever found |
| Isoetes louisianensis | Louisiana quillwort | Quillwort, Louisiana | S00T | P01 | AL, LA, MS; U.S.A. (MS, LA) | Isoetaceae | Oct 28, 1992 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Isoetes melanospora | Black spored quillwort | Quillwort, black spored | S015 | P01 | GA, SC; U.S.A. (SC, GA) | Isoetaceae | Feb 05, 1988 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Isoetes microvela | Thin-wall quillwort | quillwort, Thin-wall | S02S | P01 | NC; | Isoetaceae | NA | Ferns and Allies | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Isoetes orcuttii | Orcutt's quillwort | Quillwort, Orcutt's | S018 | P01 | CA; | Isoetaceae | NA | Ferns and Allies | 1 | Not Listed | 8 | US | P | Wherever found |
| Isoetes tegetiformans | Mat-forming quillwort | Quillwort, mat-forming | S019 | P01 | GA; U.S.A. (GA) | Isoetaceae | Feb 05, 1988 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Isoetes virginica | Virginia quillwort | quillwort, Virginia | S00B | P01 | NC, VA; | Isoetaceae | NA | Ferns and Allies | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Isonychia diversa | Diverse isonychian mayfly | Mayfly, diverse isonychian | I09S | I01 | TN; Believed to be extinct | Oligoneuridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Isoperla jewetti | Grande stripetail stonefly | Stonefly, grande stripetail | I0VS | I01 | NM, TX; | Perlodidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Isopora crateriformis | No common name | No common name | P01X | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Isotria medeoloides | Small whorled pogonia | Pogonia, small whorled | Q1XL | P01 | CT, DE, GA, IL, MA, MD, ME, MI, MO, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, WV; Canada (Ont.); U.S.A. (WV, VT, VA, TN, SC, RI, PA, NY, NJ, NH, NC, MO, MI, ME, MD, MA, IL, GA, DE, DC, CT), Canada (Ont.) | Orchidaceae | Sep 09, 1982 | Flowering Plants | 5 | Threatened | 3, 4, 5 | US/Foreign | P | Wherever found |
| Ithamar annectans | Annectans rhopalid bug | Bug, annectans rhopalid | I02U | I01 | HI; | Rhopalidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ithamar hawaiiense | Hawaiian rhopalid bug | Bug, Hawaiian rhopalid | I02W | I01 | HI; | Rhopalidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Itodacnus novicornis | Necker itodacnus click beetle | Click beetle, Necker itodacnus | I054 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Itodacnus paradoxus | Strange itodacnus click beetle | Click beetle, strange itodacnus | I055 | I01 | HI; | Elateridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Iva hayesiana | San Diego marsh elder | Marsh elder, San Diego | Q34F | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia aperta aperta | Sierra Valley ivesia | Ivesia, Sierra Valley | Q3DX | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia aperta canina | Dog Valley ivesia | Ivesia, Dog Valley | Q34G | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia argyrocoma | Silver-haired ivesia | Ivesia, silver-haired | Q10D | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia callida | Tahquitz ivesia | Ivesia, Tahquitz | Q10E | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia cryptocaulis | No common name | No common name | Q10F | P01 | NV; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia jaegeri | No common name | No common name | Q34H | P01 | CA, NV; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia kingii var. eremica | Ash Meadows ivesia | Ivesia, Ash Meadows | Q1XM | P01 | NV; U.S.A. (NV) | Rosaceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Ivesia longibracteata | No common name | No common name | Q3DY | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia multifoliolata | No common name | No common name | Q1JA | P01 | AZ; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ivesia paniculata | Ash Creek ivesia | Ivesia, Ash Creek | Q2PB | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia patellifera | Kingston Mountains cinquefoil | Cinquefoil, Kingston Mountains | Q10G | P01 | CA; | Roasceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia pickeringii | Pickering ivesia | Ivesia, Pickering | Q10H | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia pityocharis | Pine Nut Mountains ivesia | Ivesia, Pine Nut Mountains | Q34I | P01 | NV; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia rhypara rhypara | Grimy ivesia | Ivesia, grimy | Q2BY | P01 | NV, OR; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Ivesia rhypara shellyi | Venator Canyon, Shelly's ivesia | Ivesia, Venator Canyon, Shelly's | Q2U8 | P01 | OR; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ivesia sericoleuca | Plumas ivesia | Ivesia, Plumas | Q3DZ | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ivesia shockleyi ostleri | No common name | No common name | Q3E0 | P01 | UT; | Rosaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ivesia webberi | Webber's ivesia | ivesia, Webber's | Q34J | P01 | CA, NV; Ivesia webberi has a geographic range of approximately 165 acres (ac) (66.8 hectares (ha)) comprising five counties in California and Nevada along the transition zone between the eastern edge of the northern Sierra Nevada and the northwestern edge of the Great Basin. | Rosaceae | Jul 03, 2014 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Ixobrychus exilis | Least bittern | Bittern, least | B092 | V01 | AZ, CA, NV, OR, UT; | Ardeidae | NA | Birds | 1 | Not Listed | 1, 2, 6, 8 | US/Foreign | V | Wherever found |
| Jacquemontia curtissii | Pineland jacquemontia | Jacquemontia, pineland | Q10I | P01 | FL; | Convolvulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Jacquemontia reclinata | Beach jacquemontia | Jacquemontia, beach | Q2BZ | P01 | FL; U.S.A. (FL) | Convolvulaceae | Nov 24, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Jamesia americana zionis | No common name | No common name | Q34K | P01 | UT; | Saxifragaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Jamesia tetrapetala | No common name | No common name | Q34L | P01 | NV, UT; | Saxifragaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Jamesianthus alabamensis | Alabama jamesianthus | Jamesianthus, Alabama | Q10J | P01 | AL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Jaquinia umbellata | No common name | No common name | Q10K | P01 | PR, VI; | Theophrastaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Jatropha costaricensis | Costa Rican jatropha | Jatropha, Costa Rican | Q24B | P01 | Costa Rica | Euphorbiaceae | Jul 27, 1984 | Flowering Plants | Foreign | Endangered | NA | Foreign | P | Wherever found |
| Jepsonia malvifolia | Island jepsonia | Jepsonia, island | Q3E1 | P01 | CA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Joinvillea ascendens ascendens | `Ohe | `Ohe | Q1XN | P01 | HI; | Joinvilleaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Juga sp | Basalt Juga | Juga, Basalt | G0EN | I01 | OR, WA; | Pleuroceridae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Juga spb | Cinnamon juga | Juga, cinnamon | G0F0 | I01 | CA; | Pleuroceridae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Juglans californica hindsii | Northern California black walnut | Walnut, Northern California black | Q10L | P01 | CA; | Juglandaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Juglans californica var. californica | California walnut | walnut, California | Q3L7 | P01 | Juglandaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Juglans cinerea | Butternut | Butternut | Q34M | P01 | NC; | Juglandaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Juglans jamaicensis | West Indian Walnut (=Nogal) | Walnut (=Nogal), West Indian | Q34N | P01 | PR; Puerto Rico, Cuba, Dominican Republic and Haiti.; U.S.A. (PR), Cuba, Hispaniola | Juglandaceae | Jan 13, 1997 | Flowering Plants | 4 | Endangered | 4 | US/Foreign | P | Wherever found |
| Juncus caesariensis | New Jersey rush | Rush, New Jersey | Q10M | P01 | NC, VA; | Juncaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Juncus gymnocarpus | [Unnamed] rush | Rush, [unnamed] | Q10N | P01 | AL, FL, GA, MS, NC, OH, PA, SC, TN, WV; | Juncaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Juncus leiospermus leiospermus | Red Bluff rush | Rush, Red Bluff | Q10P | P01 | CA; | Juncaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Juncus leiospermus var. ahartii | Ahart's dwarf rush | rush, Ahart's dwarf | Q10O | P01 | CA; | Juncaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Juncus mertensianus | No common name | No common name | Q10R | P01 | AK; | Juncaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Juncus oronensis | [Unnamed] rush | Rush, [unnamed] | Q34O | P01 | ME; | Juncaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Juncus pervetus | Bog, Barnstable rush | Rush, bog, Barnstable | Q10Q | P01 | MA; Believed to be extinct | Juncaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Juncus trifidus carolinianus | No common name | No common name | Q2C0 | P01 | NC, NY, TN, VA, WV; | Juncaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Justicia americana | [Unnamed] water-willow | Water-willow, [unnamed] | Q10V | P01 | VA; | Acanthaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Justicia borinquensis | No common name | No common name | Q10S | P01 | PR, VI; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Justicia cooleyi | Cooley's water-willow | Water-willow, Cooley's | Q1XO | P01 | FL; Known to occur in hardwood pine forests in Hernando and Sumter Counties in Florida. ; U.S.A. (FL) | Acanthaceae | Jul 27, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Justicia crassifolia | Thick-leaved water-willow | Water-willow, thick-leaved | Q10T | P01 | FL; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Justicia culebritae | No common name | No common name | Q10U | P01 | PR, VI; | Acanthaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Justicia runyonii | Runyon's water-willow | Water-willow, Runyon's | Q10W | P01 | TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Justicia warnockii | No common name | No common name | Q10X | P01 | TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Justicia wrightii | Wright's water-willow | Water-willow, Wright's | Q10Y | P01 | NM, TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Juturnia kosteri | Koster's springsnail | Springsnail, Koster's | G04C | I01 | NM; U.S.A. (NM) | Hydrobiidae | Aug 09, 2005 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| juturnia tularosae | tularosa juturnia | No common name | F04B | I01 | hydrobiidae | NA | Clams | 2 | Not Listed | NA | US | I | Wherever found | |
| Kachuga tecta tecta | Indian sawback turtle | Turtle, Indian sawback | C01H | V01 | India | Emydidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Kadua cookiana | 'Awiwi | 'Awiwi | Q1WY | P01 | HI; U.S.A. (HI) | Rubiaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua cordata remyi | kopa | kopa | Q33Y | P01 | HI; U.S.A. (HI) | Rubiaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua coriacea | Kio`ele | Kio`ele | Q1WZ | P01 | HI; U.S.A. (HI) | Rubiaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua degeneri | No common name | No common name | Q1X0 | P01 | HI; | Rubiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua fluviatilis | Kamapua`a | Kamapua`a | Q2U1 | P01 | HI; | Rubiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua haupuensis | No common name | No common name | Q3OR | P01 | HI; Kadua haupuensis is relatively new described species (2010), and is known from one small occurrence on the north face of Mt. Haupu, on the island of Kauai (on Kipu Ranch) ((Lorence et al. 2010, pp. 137-144). Currently, there are no known extant individuals of Kadua haupuensis. There are 11 cultivated individuals of this species, seeded from the fruits collected from the original 7 plants, at the National Tropical Botanical Gardens, on the island of Kauai. ; Kadua haupuensis is relatively new described species (2010), and is known from one small occurrence on the north face of Mt. Haupu, on the island of Kauai (on Kipu Ranch) ((Lorence et al. 2010, pp. 137-144). Currently, there are no known extant individuals of Kadua haupuensis. There are 11 cultivated individuals of this species, seeded from the fruits collected from the original 7 plants, at the National Tropical Botanical Gardens, on the island of Kauai. | Rubiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua laxiflora | pilo | pilo | Q1X1 | P01 | HI; U.S.A. (HI) | Rubiaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua parvula | No common name | No common name | Q1X2 | P01 | HI; | Rubiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kadua st.-johnii | No common name | No common name | Q1X5 | P01 | HI; U.S.A. (HI) | Rubiaceae | Sep 30, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kalania hawaiiensis | Lanai kalanian leaf bug | Bug, Lanai kalanian leaf | I02X | I01 | HI; | Miridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Kalania sp. | Oahu kalanian leaf bug | Bug, Oahu kalanian leaf | I02Y | I01 | HI; | Miridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Kallstroemia perennans | Perennial caltrop | Caltrop, perennial | Q2U9 | P01 | TX; | Zygophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Kalmia cuneata | White-wicky | White-wicky | Q10Z | P01 | NC, SC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Kalmiopsis leachiana | No common name | No common name | Q2C1 | P01 | OR; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Kanaloa kahoolawensis | Kohe malama malama o kanaloa | Kohe malama malama o kanaloa | Q3GX | P01 | HI; U.S.A. (HI) | Fabaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kauaiina ioxantha | Ioxanthan looper | Looper, Ioxanthan | I09H | I01 | HI; | Geometridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Kenkia glandulosa | [Unnamed] planarian | Planarian, [unnamed] | M000 | I01 | IA, MO; | Kenkiidae | NA | Flatworms and Roundworms | 3 | Not Listed | 3 | US | I | Wherever found |
| Kenkia rhynchida | [Unnamed] planarian | Planarian, [unnamed] | M001 | I01 | OR; | Kenkiidae | NA | Flatworms and Roundworms | 1 | Not Listed | 1 | US | I | Wherever found |
| Keysseria (=Lagenifera) erici | No common name | No common name | Q3HP | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Keysseria (=Lagenifera) helenae | No common name | No common name | Q3HQ | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kinosternon bauri bauri | Key striped mud turtle | Turtle, Key striped mud | C020 | V01 | FL; | Kinosternidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Kinosternon flavescens arizonense | Arizona yellow mud turtle | Turtle, Arizona yellow mud | C046 | V01 | AZ; | Kinosternidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Kinosternon flavescens flavescens | Yellow mud turtle | Turtle, yellow mud | C04W | V01 | IA, IL, MO, NE; | Kinosternidae | NA | Reptiles | 3 | Not Listed | 3, 6 | US | V | Wherever found |
| Kinosternon flavescens spooneri | Illinois mud turtle | Turtle, Illinois mud | C01Z | V01 | IA, IL, MO; | Kinosternidae | NA | Reptiles | 3 | Not Listed | 3 | US | V | Wherever found |
| Kinosternon hirtipes murrayi | Big Bend mud turtle | Turtle, Big Bend mud | C04T | V01 | TX; | Kinosternidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Kinosternon sonoriense longifemorale | Sonoyta mud turtle | Turtle, Sonoyta mud | C067 | V01 | AZ; | Kinosternidae | Oct 20, 2017 | Reptiles | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Kleptochthonius henroti | Greenbrier Valley cave pseudoscorpion | Pseudoscorpion, Greenbrier Valley cave | J00L | I01 | WV; | Chthoniidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Kleptochthonius hetricki | Organ Cave pseudoscorpion | Pseudoscorpion, Organ Cave | J00M | I01 | WV; | Chthoniidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Kleptochthonius magnus | Pseudoscorpion | Pseudoscorpion | J01O | I01 | Chthoniidae | NA | Arachnids | 4 | Not Listed | NA | US | I | Wherever found | |
| Kleptochthonius orpheus | Orpheus cave pseudoscorpion | Pseudoscorpion, Orpheus cave | J00N | I01 | WV; | Chthoniidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Kleptochthonius proserpinae | Proserpina cave pseudoscorpion | Pseudoscorpion, Proserpina cave | J00O | I01 | WV; | Chthoniidae | NA | Arachnids | 5 | Not Listed | 5 | US | I | Wherever found |
| Kleptochthonius tantalus | Pseudoscorpion | Pseudoscorpion | J01N | I01 | Chthoniidae | NA | Arachnids | 4 | Not Listed | NA | US | I | Wherever found | |
| Koanophyllon droserolepis | Oreganillo | Oreganillo | Q0U0 | P01 | PR, VI; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Kobus leche | Red lechwe | Lechwe, red | A05O | V01 | Wherever found | Bovidae | Jun 02, 1970 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Kokia cookei | Cooke's koki`o | Koki`o, Cooke's | Q1XP | P01 | HI; U.S.A. (HI) | Malvaceae | Nov 29, 1979 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kokia drynarioides | Koki`o | Koki`o | Q1XQ | P01 | HI; U.S.A. (HI) | Malvaceae | Dec 04, 1984 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kokia kauaiensis | Koki`o | Koki`o | Q1XR | P01 | HI; U.S.A. (HI) | Malvaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kokia lanceolata | Koki`o | Koki`o | Q1XS | P01 | HI; Believed to be extinct | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Korthalsella degeneri | Hulumoa | Hulumoa | Q34P | P01 | HI; U.S.A. (HI) | Santalaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Kosteletzkya pentacarpos | Virginia saltmarsh mallow | Mallow, Virginia saltmarsh | Q110 | P01 | AL, FL; | Malvaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Labordia cyrtandrae | Kamakahala | Kamakahala | Q2C2 | P01 | HI; U.S.A. (HI) | Loganiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia decurrens decurrens | No common name | No common name | Q111 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia fagraeoidea fagraeoidea | Kamakahala | Kamakahala | Q112 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia fagraeoidea longisepala | No common name | No common name | Q113 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia fagraeoidea saint-johniana | No common name | No common name | Q114 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia fagraeoidea waianaeana | No common name | No common name | Q115 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia | Bog labordia | Labordia, Bog | Q11O | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia | No common name | No common name | Q116 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia kilaueana | No common name | No common name | Q117 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia magnifolia | No common name | No common name | Q118 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia robusta | No common name | No common name | Q119 | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia rockii | No common name | No common name | Q11A | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hedyosmifolia skottsbergii | No common name | No common name | Q11B | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia helleri | Kamakahala | Kamakahala | Q34Q | P01 | HI; U.S.A. (HI) | Loganiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia hirtella | No common name | No common name | Q1XT | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella | Mountain Labordia | Labordia, Mountain | Q11Z | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella | Mountain Labordia | Labordia, Mountain | Q11R | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella | Mountain Labordia | Labordia, Mountain | Q11P | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella | Mountain Labordia | Labordia, Mountain | Q11Q | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella | Mountain Labordia | Labordia, Mountain | Q11K | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella imbricata | No common name | No common name | Q11C | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella laevis | No common name | No common name | Q11D | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella laevisepala | No common name | No common name | Q11E | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella microcalyx | No common name | No common name | Q11F | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia hirtella microphylla | No common name | No common name | Q11G | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia kaalae brachypoda | No common name | No common name | Q11H | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia kaalae fosbergii | No common name | No common name | Q11I | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia kaalae mendax | No common name | No common name | Q11J | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia lorenciana | No common name | No common name | Q3OT | P01 | HI; Labordia lorenciana is currently known from only four individuals in the back of Waimea Valley (Na Pali-Kona Forest Reserve, upper Kawaiiki, and Molhihi-Waialae Trail to Kaluahaulu, and below the wind-swept rim into the north-facing drainage) on the island of Kauai. Labordia lorenciana is also being cultivated at the National Tropical Botanical Gardens on Kauai with the intent to be outplanted in the future (Wood et al. 2007, pp. 195-199).; Labordia lorenciana is currently known from only four individuals in the back of Waimea Valley (Na Pali-Kona Forest Reserve, upper Kawaiiki, and Molhihi-Waialae Trail to Kaluahaulu, and below the wind-swept rim into the north-facing drainage) on the island of Kauai. Labordia lorenciana is also being cultivated at the National Tropical Botanical Gardens on Kauai with the intent to be outplanted in the future (Wood et al. 2007, pp. 195−199). | Loganiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia lydgatei | Kamakahala | Kamakahala | Q2C3 | P01 | HI; U.S.A. (HI) | Loganiaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia molokaiana molokaiana | No common name | No common name | Q11L | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia molokaiana munroi | No common name | No common name | Q11M | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia molokaiana setosa | No common name | No common name | Q11N | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia pumila | Kamakahala | Kamakahala | Q34R | P01 | HI; U.S.A. (HI) | Loganiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia tinifolia euphorbioidea | No common name | No common name | Q11S | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia forbesii | No common name | No common name | Q11T | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia honolulensis | No common name | No common name | Q11U | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia microgyna | No common name | No common name | Q11V | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia parvifolia | No common name | No common name | Q11W | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia tenuifolia | No common name | No common name | Q11X | P01 | HI; | Loganiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Labordia tinifolia var. lanaiensis | Kamakahala | Kamakahala | Q2C4 | P01 | HI; U.S.A. (HI) | Loganiaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia tinifolia var. wahiawaensis | Kamakahala | Kamakahala | Q3GM | P01 | HI; U.S.A. (HI) | Loganiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Labordia triflora | Kamakahala | Kamakahala | Q11Y | P01 | HI; U.S.A. (HI) | Loganiaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Laccophilus schwarzi | Schwarz' diving beetle | Diving beetle, Schwarz' | I0KZ | I01 | AL, DC, MD, VA; | Dytiscidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Lachlania dencyanna | Gila mayfly | Mayfly, Gila | I0VX | I01 | NM; | Oligoneuriidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Lachnocaulon beyrichianum | No common name | No common name | Q120 | P01 | FL, GA, NC, SC; | Eriocaulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lachnocaulon digynum | Tiny bog buttons | Buttons, tiny bog | Q2UA | P01 | AL, FL, LA, MS, TX; | Eriocaulaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Laennecia eriophylla | [Unnamed] fleabane | Fleabane, [unnamed] | Q0PZ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lagopus leucura | White-tailed ptarmigan | Ptarmigan, white-tailed | B0GT | V02 | Phasianidae | NA | Birds | 6 | Not Listed | NA | US | V | U.S. Population | |
| Lagopus leucura | White-tailed ptarmigan | Ptarmigan, white-tailed | B0GT | V03 | Phasianidae | NA | Birds | 6 | Not Listed | NA | US/Foreign | V | Rocky Mountains population | |
| Lagopus leucura altipetens | southern white-tailed ptarmigan | Ptarmigan, southern white-tailed | B0H8 | V01 | CO; | Phasianidae | NA | Birds | 6 | Under Review in the Candidate or Petition Process | 6 | US | V | Wherever found |
| Lagopus leucura rainierensis | Mt. Rainier white-tailed ptarmigan | ptarmigan, Mt. Rainier white-tailed | B0H9 | V01 | Phasianidae | NA | Birds | 1 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Lagopus muta evermanni | Evermann's rock ptarmigan | Ptarmigan, Evermann's rock | B0AT | V01 | AK; | Phasianidae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Lagopus muta yunaskensis | Yunaska rock ptarmigan | Ptarmigan, Yunaska rock | B0AU | V01 | AK; | Phasianidae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Lagorchestes hirsutus | Western hare wallaby | Wallaby, western hare | A03T | V01 | Australia | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lagostrophus fasciatus | Banded hare wallaby | Wallaby, banded hare | A03P | V01 | Australia | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lagothrix flavicauda | Yellow-tailed woolly monkey | Monkey, yellow-tailed woolly | A06X | V01 | Andes of northern Peru | Cebidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lambdina canitiaria | [Unnamed] looper moth | Looper moth, [unnamed] | I0NR | I01 | NY; Possibly extinct,not reported since 1965 | Geometridae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Laminella sanguinea | [Unnamed] snail | Snail, [unnamed] | G09J | I01 | HI; | Amastridae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Lampetra ayresii | River lamprey | Lamprey, river | E09A | V01 | AK, CA, OR, WA; | Petromyzontidae | NA | Fishes | 1 | Not Listed | 1, 7, 8 | US | V | Wherever found |
| Lampetra hubbsi | Kern brook lamprey | Lamprey, Kern brook | E06K | V01 | CA; | Petromyzontidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Lampetra minima | Miller Lake lamprey | Lamprey, Miller Lake | E06L | V01 | OR; Believed to be extinct | Petromyzontidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Lampetra richardsoni | Western brook lamprey | Lamprey, western brook | E0AI | V01 | Petromyzontidae | NA | Fishes | 1 | Not Listed | NA | US/Foreign | V | Wherever found | |
| lampetra tridentata | Pacific lamprey | lamprey, Pacific | E0AO | V01 | petromyszontidae | NA | Fishes | 1 | Not Listed | NA | US | V | Wherever found | |
| Lampetra tridentata ssp. | Pacific lamprey | Lamprey, Pacific | E07E | V01 | AK, CA, OR, WA; | Petromyzontidae | NA | Fishes | 1 | Not Listed | 1, 7, 8 | US/Foreign | V | Pacific |
| Lampetra tridentata ssp. | Goose Lake lamprey | Lamprey, Goose Lake | E07D | V01 | CA, OR; | Petromyzontidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Goose Lake |
| Lampropeltis getula splendida | Desert king snake | Snake, desert king | C02A | V01 | AZ, NM, OK, TX; | Colubridae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| lampropeltis getula ssp. californiae | California king snake | snake, California king | C06P | V01 | colubridae | NA | Reptiles | 8 | Not Listed | NA | US | V | Wherever found | |
| Lampropeltis mexicana alterna | Gray-banded king snake | Snake, gray-banded king | C02B | V01 | TX; | Colubridae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Lampropeltis zonata parvirubra | San Bernardino mountain king snake | Snake, San Bernardino mountain king | C061 | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Lampropeltis zonata pulchra | San Diego Mountain king snake | Snake, San Diego Mountain king | C04R | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Lampsilis abrupta | Pink mucket (pearlymussel) | Mucket, pink (pearlymussel) | F00G | I01 | AL, GA, IL, KY, LA, MO, MS, OH, TN, VA, WV; U.S.A. (WV, VA, TN, PA, OH, MO, LA, KY, IN, IL, AR, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Lampsilis altilis | Finelined pocketbook | Pocketbook, finelined | F02X | I01 | AL, GA, TN; U.S.A. (GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Lampsilis binominata | Lined pocketbook | Pocketbook, lined | F02W | I01 | AL, GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Lampsilis bracteata | Texas fatmucket | Fatmucket, Texas | F04I | I01 | TX; | Unionidae | NA | Clams | 2 | Candidate | 2 | US | I | Wherever found |
| Lampsilis cariosa | Yellow lampmussel | Lampmussel, yellow | F03H | I01 | NC; | Unionidae | NA | Clams | 5 | Not Listed | 4 | US/Foreign | I | Wherever found |
| Lampsilis fullerkati | Waccamaw fatmucket | Fatmucket, Waccamaw | F03C | I01 | NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Lampsilis haddletoni | Haddleton lampmussel | Lampmussel, Haddleton | F03R | I01 | AL, FL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Lampsilis higginsii | Higgins eye (pearlymussel) | Higgins eye (pearlymussel) | F009 | I01 | IA, IL, MN, MO, SD, WI; U.S.A. (WI, NE, MO, MN, IA, IL) | Unionidae | Jun 14, 1976 | Clams | 3 | Endangered | 3, 6 | US | I | Wherever found |
| Lampsilis perovalis | Orangenacre mucket | Mucket, orangenacre | F01S | I01 | AL, MS; U.S.A. (MS, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Lampsilis powellii | Arkansas fatmucket | fatmucket, Arkansas | F02I | I01 | AR; U.S.A. (AR) | Unionidae | Apr 05, 1990 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Lampsilis rafinesqueana | Neosho Mucket | Mucket, Neosho | F00F | I01 | AR, KS, MO, OK; Neosho Mucket historically occurred in at least 18 streams within the Illinois, Neosho, and Verdigris River basins covering four states (Arkansas, Kansas, Oklahoma, and Missouri). It is endemic to the Arkansas River system (Gordon 1980; Harris and Gordon 1987; Obermeyer 1996; Vaughn 1996; Mather 1990; Obermeyer et al. 1997a; Harris et al. 2009). | Unionidae | Oct 17, 2013 | Clams | 4 | Endangered | 2, 3, 4, 6 | US | I | Wherever found |
| Lampsilis streckeri | Speckled pocketbook | Pocketbook, speckled | F020 | I01 | AR; Little Red River watershed, Arkansas; U.S.A. (AR) Endemic to Little Red River system in Boston Mountain region of north central Arkansas. Extant populations are known from the South, Archey, Middle, Beech, and Devils Forks of the Little Red River and Turkey Creek and Big Creek. | Unionidae | Feb 28, 1989 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Lampsilis subangulata | Shinyrayed pocketbook | Pocketbook, shinyrayed | F02Y | I01 | AL, FL, GA; Florida watersheds: Chipola, Ochlockonee upstream of Lake Talquin; medium-sized; clean or silty sand substrates, in slow to moderate currents; U.S.A. (GA, FL, AL) | Unionidae | Mar 16, 1998 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Lampsilis virescens | Alabama lampmussel | Lampmussel, Alabama | F00A | I01 | AL, TN; U.S.A. (TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4 | US | I | Wherever found; Except where listed as Experimental Populations |
| Lampsilis virescens | Alabama lampmussel | Lampmussel, Alabama | F00A | I02 | AL; U.S.A. (TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Lanius ludovicianus | Loggerhead Shrike | Shrike, Loggerhead | B0FY | V01 | Laniidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Lanius ludovicianus mearnsi | San Clemente loggerhead shrike | Shrike, San Clemente loggerhead | B05R | V01 | CA; U.S.A. (CA) | Laniidae | Sep 12, 1977 | Birds | 8 | Endangered | 8 | US | V | Wherever found |
| Lanius ludovicianus migrans | Migrant loggerhead shrike | Shrike, migrant loggerhead | B07E | V01 | AL, AR, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, TN, TX, VA, VT, WI, WV; | Laniidae | NA | Birds | 3 | Not Listed | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Lanius ludovicianus ssp. anthonyi | Island loggerhead shrike | shrike, Island loggerhead | B0FA | V01 | CA; | Laniidae | NA | Birds | 8 | Not Listed | 8 | US | V | Wherever found |
| Lantana depressa | No common name | No common name | Q34S | P01 | FL; | Verbenaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lanx sp. | Banbury Springs limpet | Limpet, Banbury Springs | G05Q | I01 | ID; U.S.A. (ID) | Lymnaeidae | Dec 14, 1992 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Laplacea portoricensis | Nino de cota | Nino de cota | Q121 | P01 | PR, VI; | Theaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Larca laceyi | Lacey's cave pseudoscorpion | Pseudoscorpion, Lacey's cave | J00P | I01 | CA; | Garypidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| larus atricilla | Laughing gull | gull, Laughing | B0EF | V01 | AS; | laridae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| Larus audouinii | Audouin's gull | Gull, Audouin's | B01S | V01 | Mediterranean Sea | Laridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Larus relictus | Relict gull | Gull, relict | B053 | V01 | India, China | Laridae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| lasionycteris noctivagans | Silver-haired bat | bat, Silver-haired | A0IR | V01 | vespertilionidae | NA | Mammals | 7 | Not Listed | NA | US | V | Wherever found | |
| Lasiorhinus krefftii (formerly L. barnardi and L. gillespiei) | Queensland hairy-nosed wombat (incl. Barnard's) | Wombat, Queensland hairy-nosed (incl. Barnard's) | A04F | V01 | Australia | Phascolomydae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| lasiurus blossevillii | Western red bat | bat, Western red | A0IU | V01 | vespertilionidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Lasiurus cinereus | hoary bat | bat, hoary | A0KH | V01 | Vespertilionidae | NA | Mammals | 1 | Not Listed | NA | US | V | Wherever found | |
| Lasiurus cinereus semotus | Hawaiian hoary bat | Bat, Hawaiian hoary | A03W | V01 | HI; Entire | Vespertilionidae | Oct 13, 1970 | Mammals | 1 | Endangered | 1 | US | V | Wherever found |
| Lasiurus ega | Southern Yellow Bat | Bat, Southern Yellow | A0JA | V01 | Vespertilionidae | NA | Mammals | 8 | Not Listed | NA | US | V | Wherever found | |
| Lasius nevadensis | Charleston Ant | Ant, Charleston | I0TE | I01 | Formicidae | NA | Insects | 1 | Not Listed | NA | US | I | Wherever found | |
| Lasmigona decorata | Carolina heelsplitter | Heelsplitter, Carolina | F02L | I01 | NC, SC; U.S.A. (SC, NC) | Unionidae | Jun 30, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Lasmigona holstonia | Tennessee heelsplitter | Heelsplitter, Tennessee | F01N | I01 | AL, GA, IL, IN, KY, TN, VA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | I | Wherever found |
| Lasmigona sp. | Barrens heelsplitter | Heelsplitter, Barrens | F03F | I01 | TN; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Lasmigona subviridis | Green floater | Floater, green | F03E | I01 | GA, NC, VA; | Unionidae | NA | Clams | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Lasthenia burkei | Burke's goldfields | Goldfields, Burke's | Q1XU | P01 | CA; U.S.A. (CA) | Asteraceae | Dec 02, 1991 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lasthenia conjugens | Contra Costa goldfields | Goldfields, Contra Costa | Q122 | P01 | CA; U.S.A. (CA) | Asteraceae | Jun 18, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lasthenia glabrata coulteri | Seaside, Coulter's daisy | Daisy, seaside, Coulter's | Q3E2 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lasthenia leptalea | Salinas Valley baeria | Baeria, Salinas Valley | Q123 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lasthenia macrantha prisca | Slender meadowfoam | Meadowfoam, slender | Q124 | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lasthenia maritima | Seaside goldfields | Goldfields, seaside | Q125 | P01 | CA, OR, WA; Canada (B.C.) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Laterallus jamaicensis | Black Rail | Rail, Black | B09A | V01 | AL, AR, CO, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MO, MS, NC, NJ, NY, OH, OK, PA, PR, RI, SC, TN, TX, VA, VI, WV; | Rallidae | NA | Birds | 4 | Not Listed | 2, 3, 4, 5, 6 | US | V | Wherever found |
| laterallus jamaicensis ssp. coturniculus | California black rail | rail, California black | B0EE | V01 | rallidae | NA | Birds | 8 | Not Listed | NA | US | V | Wherever found | |
| Laterallus jamaicensis ssp. jamaicensis | Eastern Black rail | rail, Eastern Black | B0OB | V01 | AL, AR, CO, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, NE, NH, NJ, NM, NY, OH, OK, PA, PR, RI, SC, TN, TX, VA, VI, VT, WI, WV; | Rallidae | NA | Birds | 4 | Proposed Threatened | 2, 3, 4, 5, 6 | US | V | Wherever found |
| Laterallus tuerosi | Junin rail | Rail, Junin | B0BV | V01 | Peru | Rallidae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lathyrus biflorus | Two-flowered lathyrus | Lathyrus, two-flowered | Q2PC | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lathyrus grimesii | Grimes vetchling | Vetchling, Grimes | Q3HB | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lathyrus hitchcockianus | Bullfrog Mountain wild pea | Wild pea, Bullfrog Mountain | Q126 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lathyrus holochlorus | No common name | No common name | Q127 | P01 | HI, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lathyrus jepsonii jepsonii | Delta tule-pea | Tule-pea, Delta | Q128 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lathyrus torreyi | Torrey's pea | Pea, Torrey's | Q3KL | P01 | Fabaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Latimeria chalumnae | African coelacanth | coelacanth, African | E0D9 | V01 | Tanzanian DPS | Coelacanthidae | Apr 28, 2016 | Fishes | NMFS | Threatened | NA | Foreign | V | Tanzanian Distinct Population Segment (DPS) of African coelacanth |
| Lavatera assurgentiflora | Island tree mallow | Mallow, Island tree | Q129 | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lavinia exilicauda chi | Clear Lake Hitch | Hitch, Clear Lake | E0C4 | V01 | CA; | Cyprinidae | NA | Fishes | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Lavinia symmetricus mitrulus | Pit roach | Roach, pit | E07K | V01 | CA, OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Lavinia symmetricus parvipinnis | Gualala roach | Roach, Gualala | E07J | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Lavinia symmetricus ssp. | Red Hills roach | Roach, Red Hills | E09E | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Layia carnosa | Beach layia | Layia, beach | Q34T | P01 | CA; U.S.A. (CA) | Asteraceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Layia discoidea | Rayless layia | Layia, rayless | Q12A | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Layia heterotricha | Pale-yellow layia | Layia, pale-yellow | Q3E3 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Layia jonesii | Jones layia | Layia, Jones | Q12B | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Layia leucopappa | Comanche layia | Layia, Comanche | Q12C | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Layia platyglossa | Ziegler's layia | Layia, Ziegler's | Q12D | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Leavenworthia alabamica brachystyla | [Unnamed] glade cress | Glade cress, [unnamed] | Q12I | P01 | AL; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia alabamica ssp. alabamica | Alabama glade cress | Glade cress, Alabama | Q12H | P01 | AL; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia aurea | Golden glade cress | Glade cress, golden | Q12J | P01 | OK; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Leavenworthia crassa | Fleshy-fruit gladecress | Gladecress, Fleshy-fruit | Q12K | P01 | AL; | Brassicaceae | Aug 01, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Leavenworthia crassa elongata | [Unnamed] glade cress | Glade cress, [unnamed] | Q12E | P01 | AL; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia exigua exigua | No common name | No common name | Q12L | P01 | AL, GA, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia exigua laciniata | Kentucky glade cress | Glade cress, Kentucky | Q12F | P01 | KY; | Brassicaceae | Jun 05, 2014 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Leavenworthia exigua lutea | [Unnamed] glade cress | Glade cress, [unnamed] | Q12G | P01 | AL, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia stylosa | No common name | No common name | Q12M | P01 | AL, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leavenworthia texana | Texas golden Gladecress | Gladecress, Texas golden | Q34U | P01 | TX; | Brassicaceae | Oct 11, 2013 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Leavenworthia torulosa | Necklace gladecress | Gladecress, necklace | Q12N | P01 | AL, KY, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lecanora masana | No common name | No common name | U010 | P01 | NC; | Lecanoraceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Lecanora xanthosora | No common name | No common name | Q3E4 | P01 | CA; | Lecanoraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Lechea cernua | No common name | No common name | Q12O | P01 | FL; | Cistaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lechea divaricata | No common name | No common name | Q12P | P01 | FL; | Cistaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lechea lakelae | No common name | No common name | Q12Q | P01 | FL; | Cistaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lechea maritima virginica | Beach, Virginian pinweed | Pinweed, beach, Virginian | Q12R | P01 | VA; | Cistaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Lechea mensalis | Chisos pinweed | Pinweed, Chisos | Q12S | P01 | TX; | Cistaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Lednia tumana | Meltwater lednian stonefly | Stonefly, meltwater lednian | I0EE | I01 | MT; | Nemouridae | NA | Insects | 6 | Proposed Threatened | 6 | US | I | Wherever found |
| Legenere limosa | Legenere | Legenere | Q12U | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Legousia speculum-veneris | Lake Alamanor bluecup | Bluecup, Lake Alamanor | Q0WE | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Leiocephalus eremitus | Navassa curley-tailed lizard | Lizard, Navassa curley-tailed | C03M | V01 | Believed to be extinct | Iguanidae | NA | Reptiles | 4 | Not Listed | NA | US | V | Wherever found |
| Leiolopisma telfairi | Round Island skink | Skink, Round Island | C036 | V01 | Indian Ocean-Mauritius | Scincidae | Jun 22, 1983 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Leiopelma hamiltoni | Stephen Island frog | Frog, Stephen Island | D003 | V01 | New Zealand | Leiopelmatidae | Jun 02, 1970 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leitneria floridana | Corkwood | Corkwood | Q12V | P01 | FL; | Leitneriaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lejeunea blomquistii | No common name | No common name | Q34V | P01 | GA, NC; | Lejeuneaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lemiox rimosus | Birdwing pearlymussel | Pearlymussel, birdwing | F00I | I01 | TN, VA; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Lemiox rimosus | Birdwing pearlymussel | Pearlymussel, birdwing | F00I | I02 | AL; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Lemiox rimosus | Birdwing pearlymussel | Pearlymussel, birdwing | F00I | I03 | U.S.A. (VA, TN, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Lemuridae (incl. genera Lemur, Phaner, Hapalemur, Lepilemur, Microcebus, Allocebus, Cheirogaleus, Varecia) | Lemurs | Lemurs | A05P | V01 | Malagasy Republic(Madagascar) | Lemuridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lenophyllum texanum | Texas stonecrop | Stonecrop, Texas | Q1NU | P01 | TX; | Crassulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lentipes concolor | O`opu alamo`o | O`opu alamo`o | E03Z | V01 | HI; | Gobiidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Leontopithecus spp. | Golden-rumped tamarin | Tamarin, golden-rumped | A02F | V01 | Brazil | Callithricidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leopardus (=Felis) pardalis | Ocelot | Ocelot | A084 | V01 | AZ, TX; Mexico,Central & South America; U.S.A.(AZ,TX),Central & South America | Felidae | Mar 28, 1972 | Mammals | 2 | Endangered | 2 | US/Foreign | V | wherever found |
| Leopardus (=Felis) tigrinus | Tiger cat | Cat, tiger | A03Z | V01 | Costa Rica to northern Argentina; Entire | Felidae | Mar 28, 1972 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leopardus (=Felis) wiedii | Margay | Margay | A042 | V01 | Mexico southward | Felidae | Mar 30, 1972 | Mammals | 2 | Endangered | NA | US/Foreign | V | Wherever found |
| Leopardus wiedii cooperi | Texas margay | Margay, Texas | A0BA | V01 | TX; Believed to be extinct | Felidae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Lepanthes dodiana | No common name | No common name | Q12W | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lepanthes eltoroensis | No common name | No common name | Q2C5 | P01 | PR; Endemic to Puerto Rico. Known from El Yunque National Forest; U.S.A. (PR) | Orchidaceae | Nov 29, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Lepanthopsis melanantha | Tiny orchid | Orchid, tiny | Q12X | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lepechinia cardiophylla | Heart-leaved pitcher-sage | Pitcher-sage, heart-leaved | Q2C6 | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepechinia ganderi | Gander's pitcher-sage | Pitcher-sage, Gander's | Q2C7 | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepidium arbuscula | `Anaunau | `Anaunau | Q12Y | P01 | HI; U.S.A. (HI) | Brassicaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lepidium barnebyanum | Barneby ridge-cress | Ridge-cress, Barneby | Q1XV | P01 | UT; U.S.A. (UT) | Brassicaceae | Sep 28, 1990 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Lepidium bidentatum o-waihiense | `Anaunau | `Anaunau | Q1XW | P01 | HI; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lepidium bidentatum remyi | Remy's `anaunau | `Anaunau, Remy's | Q12Z | P01 | HI; Possibly extinct,last observed in 1855. | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lepidium davisii | Davis' pepper cress | Pepper cress, Davis' | Q130 | P01 | ID, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lepidium flavum felipense | Borrego Valley peppergrass | Peppergrass, Borrego Valley | Q2UB | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepidium huberi | Huber's Pepperwort | Pepperwort Huber's | Q3M4 | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Lepidium integrifolium | Thickleaf Pepperwort | Pepperwort Thickleaf | Q3M5 | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Lepidium jaredii album | Panoche peppergrass | Peppergrass, Panoche | Q3E5 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepidium jaredii jaredii | Jared's peppergrass | Peppergrass, Jared's | Q3E6 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepidium latipes var. heckardii | Heckard's Dwarf Pepper-grass | Pepper-grass, Heckard's Dwarf | Q3J1 | P01 | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Lepidium montanum neeseae | No common name | No common name | Q2C8 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lepidium montanum stellae | Kodachrome peppergrass | Peppergrass, kodachrome | Q2C9 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lepidium nanum | No common name | No common name | Q131 | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lepidium orbiculare | No common name | No common name | Q3OM | P01 | HI; Currently, there is one small occurrence of Lepidium orbiculare on the Kipu side of a gap on the ridge up to Mt. Haupu, on the island of Kauai (Wagner et al. 2012, p. 19; PEPP 2014, in litt.: Smithsonian Institute 2014−Online Herbarium Database). | Brassicaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lepidium ostleri | Ostler's peppergrass | Peppergrass, Ostler's | Q2UC | P01 | UT; ; Lepidium ostleri is known from four distinct populations on private lands in the southern San Francisco Mountains in Beaver County, Utah—the Grampian Hill, Cupric Mine, Copper Gulch, and Indian Queen populations (Miller 2010g, p. 6; Roth 2010a, pp. 1–2). We are not aware of any additional populations. Surveys were conducted on BLM lands adjacent to the known populations in 2010, and no plants or habitat were found (Miller 2010g, Appendix B and p. 6; Roth 2010a, pp. 1–3); these adjacent areas do not contain Ordovician Limestone, the substrate that supports L. ostleri (Miller 2010g, p. 6). Similarly, no additional populations were found during surveys of the San Francisco Mountains and surrounding ranges (including the Wah Wah Mountains, Crystal Peak, the Confusion Range, and the Mountain Home Range) (Kass 1992a, p. 5; Kass 1992b, p. 4; Evenden 1998, p. 5; Robinson 2004, p. 16; Miller 2010c, entire; Roth 2010a, pp. 2–3). | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lepidium papilliferum | Slickspot peppergrass | Peppergrass, Slickspot | Q34X | P01 | ID; U.S.A. (ID) | Brassicaceae | Sep 16, 2016 | Flowering Plants | 1 | Threatened | 1 | US | P | Entire |
| Lepidium serra | `Anaunau | `Anaunau | Q132 | P01 | HI; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| lepidium virginicum var. robinsonii | Robinson's pepper-grass | pepper-grass, Robinson's | Q3KG | P01 | brassicaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Lepidochelys kempii | Kemp's ridley sea turtle | Sea turtle, Kemp's ridley | C00O | V01 | AL, FL, GA, LA, MS, NC, SC, TX, VA; Mexico-Atlantic Coast,tropical and temperate waters in Atlantic Basin; Mexico-Atlantic Coast,tropical and temperate waters in Atlantic Basin USA - The range of the Kemp's ridley includes the Gulf coasts of Mexico and the U.S., and the Atlantic coast of North America as far north as Nova Scotia and Newfoundland. Most Kemp's ridleys nest on the coastal beaches of the Mexican states of Tamaulipas and Veracruz, although a very small number of Kemp's ridleys nest consistently at Padre Island National Seashore, Texas. Hatchlings, after leaving the nesting beach, are believed to become entrained in eddies within the Gulf of Mexico, where they are dispersed within the Gulf and Atlantic by oceanic surface currents until they reach about 20 cm in length, at which size they enter coastal shallow water habitats. (http://www.fws.gov/northflorida/SeaTurtles/Turtle%20Factsheets/Kemps-Ridley-Sea-Turtle.htm) | Cheloniidae | Dec 02, 1970 | Reptiles | 2 | Endangered | 2, 4, 5 | US/Foreign | V | Wherever found |
| Lepidochelys olivacea | Olive ridley sea turtle | Sea turtle, olive ridley | C00V | V01 | CA, HI, OR; Pacific Ocean,except breeding pops on Pacific Coast of Mexico; Tropical regions of the Pacific, Atlantic, and Indian Oceans (excluding breeding populations on the Pacific Coast of Mexico). | Cheloniidae | Jul 28, 1978 | Reptiles | 4 | Threatened | 1, 8 | US/Foreign | V | Wherever found, except when listed as endangered under 50 CFR 224.101 |
| Lepidochelys olivacea | Olive ridley sea turtle | Sea turtle, olive ridley | C00V | V02 | Mexico (Pacific Coast breeding pop only); Mexico (Pacific Coast breeding population only). | Cheloniidae | Jul 28, 1978 | Reptiles | Foreign | Endangered | NA | Foreign | V | Breeding colony populations on Pacific coast of Mexico |
| Lepidomeda albivallis | White River spinedace | Spinedace, White River | E04P | V01 | NV; U.S.A. (NV) | Cyprinidae | Sep 12, 1985 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Lepidomeda altivelis | Pahranagat spinedace | Spinedace, Pahranagat | E04N | V01 | NV; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Lepidomeda copei | Northern leatherside Chub | Chub, Northern leatherside | E0B9 | V01 | ID, UT; | Cyprinidae | NA | Fishes | 6 | Not Listed | 1, 6 | US | V | Wherever found |
| Lepidomeda mollispinis mollispinis | Virgin River spinedace | Spinedace, Virgin River | E04O | V01 | AZ, NV, UT; | Cyprinidae | NA | Fishes | 6 | Under Review in the Candidate or Petition Process | 2, 6, 8 | US | V | Wherever found |
| Lepidomeda mollispinis pratensis | Big Spring spinedace | Spinedace, Big Spring | E04L | V01 | NV; U.S.A. (NV) | Cyprinidae | Mar 28, 1985 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Lepidomeda vittata | Little Colorado spinedace | Spinedace, Little Colorado | E04M | V01 | AZ; U.S.A. (AZ) | Cyprinidae | Mar 11, 1967 | Fishes | 2 | Threatened | 2 | US | V | Wherever found |
| Lepidospartum burgessii | Gypsum scalebroom | Scalebroom, gypsum | Q2PD | P01 | NM, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lepidostoma astaneum | Goeden's lepidostoman caddisfly | Caddisfly, Goeden's lepidostoman | I03S | I01 | OR; | Lepidostomatidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Lepidostoma ermanae | Cold Spring caddisfly | Caddisfly, Cold Spring | I0N2 | I01 | CA; | Lepidostomatidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lepidostoma etnieri | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0PK | I01 | TN; | Lepidostomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Lepidostoma fischeri | Fischer's lelpidostoman caddisfly | Caddisfly, Fischer's lelpidostoman | I03O | I01 | OR; | Lepidostomatidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Lepidostoma morsei | Morse's Little Plain Brown sedge | sedge, Morse's Little Plain Brown | I0WQ | I01 | DE, FL, MS, NJ, TX; | Lepidostomatidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 2, 4, 5 | US | I | Wherever found |
| Lepidurus packardi | Vernal pool tadpole shrimp | Tadpole shrimp, vernal pool | K048 | I01 | CA, OR; U.S.A. (CA) | Caenestheriidae | Sep 19, 1994 | Crustaceans | 8 | Endangered | 1, 8 | US | I | Wherever found |
| Lepismadora algodones | Algondones sand jewel beetle | Jewel beetle, Algondones sand | I0S9 | I01 | Buprestidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Leporillus conditor | Stick-nest rat | Rat, stick-nest | A04C | V01 | Wherever found | Muridae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lepraria lanata | Appalachian dust bunnies | dust bunnies, Appalachian | U011 | P01 | NC; | Stereocaulaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Leptachatina lepida | [Unnamed] snail | Snail, [unnamed] | G09K | I01 | HI; | Amastridae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Leptailurus (=Felis) serval constantina | Barbary serval | Serval, Barbary | A02A | V01 | Algeria | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leptasthenura xenothorax | White-browed tit-spinetail | Tit-spinetail, white-browed | B0BL | V01 | Peru | Furnariidae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leptocereus grantianus | No common name | No common name | Q34Y | P01 | PR; Endemic to the Culebra island; U.S.A. (PR) | Cactaceae | Feb 26, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Leptocereus quadricostatus | [Unnamed] sebucan | Sebucan, [unnamed] | Q0DV | P01 | PR, VI; | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leptodactylon glabrum | No common name | No common name | Q34Z | P01 | ID, NV; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Leptodactylon jaegeri | San Jacinto prickly-phlox | Prickly-phlox, San Jacinto | Q2CA | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Leptodactylon pungens hazeliae | No common name | No common name | Q350 | P01 | ID, OR; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Leptodactylon sp. | Sp. nov. ined. leptodactylon | Leptodactylon, sp. nov. ined. | Q3E7 | P01 | CO; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Leptodea leptodon | Scaleshell mussel | Mussel, scaleshell | F00W | I01 | AR, IL, MO, NE, OK, SD; U.S.A. (WI, TN, SD, OK, OH, MO, MN, KY, IN, IL, IA, AR, AL) | Unionidae | Oct 09, 2001 | Clams | 3 | Endangered | 2, 3, 4, 6 | US | I | Wherever found |
| Leptogryllus deceptor | Oahu deceptor bush cricket | Cricket, Oahu deceptor bush | I05N | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Leptonycteris curasoae yerbabuenae | Lesser long-nosed bat | Bat, lesser long-nosed | A0AD | V01 | AZ, NM; Entire; Mexico,Central America | Phyllostomidae | Sep 30, 1988 | Mammals | 2 | Recovery | 2 | US/Foreign | V | Wherever found |
| Leptonycteris nivalis | Mexican long-nosed bat | Bat, Mexican long-nosed | A0AE | V01 | NM, TX; Entire; Mexico,Central America | Phyllostomidae | Sep 30, 1988 | Mammals | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Leptophlebia konza | Konza Prairie Mayfly | Mayfly Konza Prairie | I0V8 | I01 | Leptophlebiidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Leptoptilos dubius | Greater adjutant | Adjutant, greater | B0C3 | V01 | India, Cambodia, Nepal, Bangladesh, Vietnam, Thailand. Malaysia, Myanmar, Pakistan, Indonesia, Brunei | Ciconiidae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leptotes cassius theonus | Cassius Blue Butterfly | Butterfly, cassius blue | I0W4 | I01 | U.S.A. (FL), Bahamas, Greater Antilles, Cayman Islands | Lycaenidae | Apr 06, 2012 | Insects | 4 | Similarity of Appearance to a Threatened Taxon | NA | US | I | Wherever found |
| Leptothymenium sharpii | Mt. Leconte moss | Moss, Mt. Leconte | Q3E8 | P01 | NC, TN; | Leskeaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Leptotila rufaxilla wellsi | Grenada gray-fronted dove | Dove, Grenada gray-fronted | B01C | V01 | West Indies-Grenada | Columbidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leptoxis ampla | Round rocksnail | Rocksnail, round | G08D | I01 | AL; U.S.A. (AL) | Pleuroceridae | Oct 28, 1998 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Leptoxis arkansensis | Arkansas mudalia | mudalia, Arkansas | G0GD | I01 | AR, MO; | Pleuroceridae | May 04, 2019 | Snails | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Leptoxis clipeata | Agate rocksnail | Rocksnail, agate | G083 | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis compacta | Oblong rocksnail | Rocksnail, oblong | G08A | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Leptoxis crassa | Boulder snail | Snail, boulder | G01G | I01 | AL, GA, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis foremani | Interrupted (=Georgia) Rocksnail | Rocksnail, interrupted (=Georgia) | G0C2 | I01 | AL, GA; U.S.A. (GA, AL) | Pleuroceridae | Dec 02, 2010 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Leptoxis formosa | Maiden rocksnail | Rocksnail, maiden | G089 | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis ligata | Rotund rocksnail | Rocksnail, rotund | G08E | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis lirata | Lyrate rocksnail | Rocksnail, lyrate | G088 | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis melanoides | Black mudalia | Mudalia, black | G079 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis minor | Knob mudalia | Mudalia, knob | G07A | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis occultata | Bigmouth rocksnail | Rocksnail, bigmouth | G084 | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis picta | Spotted rocksnail | Rocksnail, spotted | G08G | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Leptoxis plicata | Plicate rocksnail | Rocksnail, plicate | G08C | I01 | AL; U.S.A. (AL) | Pleuroceridae | Oct 28, 1998 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Leptoxis praerosa | Onyx rocksnail | Rocksnail, onyx | G01B | I01 | KY, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis showalterii | Coosa rocksnail | Rocksnail, Coosa | G085 | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis subglubosa umbilicata | Umbilicate river snail | Snail, umbilicate river | G01I | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis taeniata | Painted rocksnail | Rocksnail, painted | G08B | I01 | AL; U.S.A. (AL) | Pleuroceridae | Oct 28, 1998 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Leptoxis virgata | Smooth rocksnail | Rocksnail, smooth | G08F | I01 | AL, NC, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Leptoxis vittata | Striped rocksnail | Rocksnail, striped | G08H | I01 | AL; Believed to be extinct | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lepus americanus tahoensis | Sierra Nevada snowshoe hare | Hare, Sierra Nevada snowshoe | A0B1 | V01 | CA, NV; | Leporidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Lepus californicus bennettii | San Diego black-tailed jackrabbit | Jackrabbit, San Diego black-tailed | A0G7 | V01 | CA; | Leporidae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Lepus callotis | White-sided jackrabbit | Jackrabbit, white-sided | A09C | V01 | NM; | Leporidae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Lepyrium showalteri | Flat pebblesnail | Pebblesnail, flat | G07F | I01 | AL; U.S.A. (AL) | Hydrobiidae | Oct 28, 1998 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Lespedeza leptostachya | Prairie bush-clover | Bush-clover, prairie | Q2CB | P01 | IA, IL, MN, WI; U.S.A. (WI, MN, IL, IA) | Fabaceae | Jan 09, 1987 | Flowering Plants | 3 | Threatened | 3 | US | P | Wherever found |
| Lesquerella angustifolia | Thread-leaved bladder-pod | Bladder-pod, thread-leaved | Q133 | P01 | OK, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lesquerella arctica scammanae | No common name | No common name | Q134 | P01 | AK; | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Lesquerella aurea | Golden bladder-pod | Bladder-pod, golden | Q135 | P01 | CO, NM; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Lesquerella carinata | Keeled bladderpod | Bladderpod, keeled | Q2UD | P01 | ID, MT, WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 1, 6 | US | P | Wherever found |
| Lesquerella condensata | No common name | No common name | Q2UE | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella congesta | Dudley Bluffs bladderpod | Bladderpod, Dudley Bluffs | Q351 | P01 | CO; U.S.A. (CO) | Brassicaceae | Feb 06, 1990 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Lesquerella densipila | Duck River bladder-pod | Bladder-pod, Duck River | Q136 | P01 | AL, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lesquerella fremontii | Fremont's bladder-pod | Bladder-pod, Fremont's | Q137 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella garrettii | Garrett bladder-pod | Bladder-pod, Garrett | Q138 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella gooddingii | Gooddings bladder-pod | Bladder-pod, Gooddings | Q13A | P01 | AZ, NM; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lesquerella hitchcockii | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q13B | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lesquerella humilis | [Unnamed] bladderpod | Bladderpod, [unnamed] | Q352 | P01 | MT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella kaibabensis | Kaibab bladderpod | Bladderpod, Kaibab | Q2UF | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Lesquerella kingii diversifolia | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q13C | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lesquerella kingii ssp. bernardina | San Bernardino Mountains bladderpod | Bladderpod, San Bernardino Mountains | Q2CD | P01 | CA; San Bernardino Mountains. San Bernardino County, California. U.S.A. | Brassicaceae | Aug 24, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lesquerella lata | Lincoln County bladder-pod | Bladder-pod, Lincoln County | Q13D | P01 | NM; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lesquerella lescurii | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q13E | P01 | KY, TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lesquerella lesicii | Pryor Mountains Bladderpod | Bladderpod Pryor Mountains | Q3M6 | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Lesquerella lyrata | Lyrate bladderpod | Bladderpod, lyrate | Q1XX | P01 | AL; U.S.A. (AL) | Brassicaceae | Sep 28, 1990 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Lesquerella macrocarpa | Large-fruited bladder-pod | Bladder-pod, large-fruited | Q13F | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella mcvaughiana | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q13G | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| lesquerella navajoensis | No common name | No common name | Q3LM | P01 | brassicaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Lesquerella pallida | White bladderpod | Bladderpod, white | Q2PE | P01 | TX; U.S.A. (TX) | Brassicaceae | Mar 11, 1987 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Lesquerella parviflora | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q2PF | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella paysonii | [Unnamed] bladderpod | Bladderpod, [unnamed] | Q3E9 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella perforata | Spring Creek bladderpod | Bladderpod, Spring Creek | Q13H | P01 | TN; U.S.A. (TN) | Brassicaceae | Dec 23, 1996 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Lesquerella pruinosa | [Unnamed] bladder-pod | Bladder-pod, [unnamed] | Q13I | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella rubicundula | Bryce bladder-pod | Bladder-pod, Bryce | Q13J | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lesquerella thamnophila | Zapata bladderpod | Bladderpod, Zapata | Q13L | P01 | TX; U.S.A. (TX), Mexico | Brassicaceae | Nov 22, 1999 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Lesquerella tumulosa | Kodachrome bladderpod | Bladderpod, kodachrome | Q1XY | P01 | UT; U.S.A. (UT) | Brassicaceae | Oct 06, 1993 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Lesquerella valida | Strong bladder-pod | Bladder-pod, strong | Q13M | P01 | NM, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lessingia arachnoidea | No common name | No common name | Q3EA | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lessingia germanorum (=L.g. var. germanorum) | San Francisco lessingia | Lessingia, San Francisco | Q3AI | P01 | CA; U.S.A. (CA) | Asteraceae | Jun 19, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lessingia glandulifera tomentosa | Warner Springs lessingia | Lessingia, Warner Springs | Q2UG | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lessingia micradenia glabrata | No common name | No common name | Q3EB | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lessingia micradenia micradenia | No common name | No common name | Q3EC | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Leucopeza semperi | Semper's warbler (=wood) | Warbler (=wood), Semper's | B03K | V01 | West Indies-Saint Lucia | Emberizidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leucopsar rothschildi | Rothschild's starling (myna) | Starling, Rothschild's (myna) | B03B | V01 | Indonesia (Bali) | Sturnidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Leucosticte atrata | Black Rosy-Finch | Rosy-Finch, Black | B0J4 | V01 | Fringillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Leuctra szczytkoi | Schoolhouse Springs leuctran stonefly | Stonefly, Schoolhouse Springs leuctran | I0EG | I01 | LA; | Leuctridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Lewisia cantelowii | Cantelow's lewisia | Lewisia, Cantelow's | Q2CE | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia columbiana wallowensis | No common name | No common name | Q13N | P01 | ID, MT, OR; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Lewisia congdonii | Congdon's lewisia | Lewisia, Congdon's | Q2CF | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia cotyledon heckneri | Heckner's lewisia | Lewisia, Heckner's | Q2PG | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia cotyledon howellii | Howell's lewisia | Lewisia, Howell's | Q2PH | P01 | CA, OR; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lewisia cotyledon purdyi | No common name | No common name | Q2PI | P01 | OR; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lewisia cotyledon ssp. | Fringed (unnamed ssp.) lewisia | Lewisia, fringed (unnamed ssp.) | Q2CG | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia disepala | Yosemite bitterroot | Bitterroot, Yosemite | Q13O | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia longipetala | Long-petaled lewisia | Lewisia, long-petaled | Q13P | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia maguirei | No common name | No common name | Q13Q | P01 | NV; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia oppositifolia | Opposite-leaved lewisia | Lewisia, opposite-leaved | Q2CH | P01 | CA, OR; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lewisia serrata | Saw-toothed lewisia | Lewisia, saw-toothed | Q13R | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lewisia stebbinsii | Stebbins lewisia | Lewisia, Stebbins | Q13S | P01 | CA; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Liatris borealis | [Unnamed] blazingstar | Blazingstar, [unnamed] | Q353 | P01 | CT, DE, MA, ME, NH, NJ, NY, PA, RI; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Liatris cymosa | No common name | No common name | Q13U | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Liatris helleri | Heller's blazingstar | Blazingstar, Heller's | Q2CI | P01 | NC; U.S.A. (NC) | Asteraceae | Nov 19, 1987 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Liatris ohlingerae | Scrub blazingstar | Blazingstar, scrub | Q1XZ | P01 | FL; U.S.A. (FL) | Asteraceae | Jul 27, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Liatris provincialis | Godfrey's blazingstar | Blazingstar, Godfrey's | Q2PJ | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Liatris tenuis | Slender gay-feather | Gay-feather, slender | Q13V | P01 | LA, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Libellula jesseana | Purple skimmer | skimmer, Purple | I0WZ | I01 | FL; | Libellulidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Lichenostomus melanops cassidix (=Meliphaga c.) | Helmeted honeyeater | Honeyeater, helmeted | B041 | V01 | Australia | Meliphagidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lichnanthe albopilosa | White sand bear scarab | Scarab, white sand bear | I0D2 | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lichnanthe ursina | Bumblebee scarab | Scarab, bumblebee | I0D3 | I01 | CA; | Glaphyridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ligusticum porteri brevilobum | No common name | No common name | Q13W | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Liguus fasciatus | Florida tree snail | Snail, Florida tree | G01H | I01 | FL; | Bulimulidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lilaeopsis carolinensis | No common name | No common name | Q13X | P01 | AL, FL, GA, LA, MS, NC, SC, VA; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Lilaeopsis masonii | Mason's lilaeopsis | Lilaeopsis, Mason's | Q13Y | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lilaeopsis schaffneriana var. recurva | Huachuca water-umbel | Water-umbel, Huachuca | Q2PK | P01 | AZ; U.S.A. (AZ), Mexico | Apiaceae | Jan 06, 1997 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Lilium bolanderi | Bolander's lily | Lily, Bolander's | Q2CJ | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lilium fairchildii | Fairchild's lily | Lily, Fairchild's | Q2CK | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lilium grayi | Gray's lily | Lily, Gray's | Q13Z | P01 | NC; | Liliaceae | NA | Flowering Plants | 5 | Not Listed | 4 | US | P | Wherever found |
| Lilium humboldtii ocellatum | Humboldt lily | Lily, Humboldt | Q3ED | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lilium iridollae | Panhandle lily | Lily, panhandle | Q140 | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Lilium maritimum | Coast lily | Lily, coast | Q354 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lilium occidentale | Western lily | Lily, Western | Q1Y0 | P01 | CA, OR; U.S.A. (OR, CA) | Liliaceae | Aug 17, 1994 | Flowering Plants | 8 | Endangered | 1, 8 | US | P | Wherever found |
| Lilium pardalinum ssp. pitkinense | Pitkin Marsh lily | Lily, Pitkin Marsh | Q141 | P01 | CA; U.S.A. (CA) | Liliaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lilium pardalinum ssp. vollmeri | Vollmer's lily | Lily, Vollmer's | Q142 | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lilium pardalinum ssp. wigginsii | Wiggins' lily | Lily, Wiggins' | Q144 | P01 | CA, OR; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lilium parryi | Lemon lily | Lily, lemon | Q2PL | P01 | AZ, CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Lilium washingtonianum minus | Small Shasta lily | Lily, small Shasta | Q143 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Limbella fryei | No common name | No common name | Q3EE | P01 | OR; | Amblystegiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Limenitis archippus obsoletus | Obsolete viceroy butterfly | Butterfly, obsolete viceroy | I00O | I01 | AZ, CA, NM, NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 2, 8 | US/Foreign | I | Wherever found |
| Limenitus archippus lahontani | Nevada viceroy | Viceroy, Nevada | I0OQ | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Limenitus weidemeyerii nevadae | Nevada admiral | Admiral, Nevada | I0MN | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Limnadia lenticularis | American clam shrimp | Clam shrimp, American | K04C | I01 | FL, MA; Greenland,Northern Europe | Limnadiidae | NA | Crustaceans | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Limnanthes bakeri | Baker's meadowfoam | Meadowfoam, Baker's | Q145 | P01 | CA; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Limnanthes douglasii sulphurea | Point Reyes meadowfoam | Meadowfoam, Point Reyes | Q146 | P01 | CA; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Limnanthes floccosa bellingeriana | Bellinger's meadowfoam | Meadowfoam, Bellinger's | Q147 | P01 | CA, OR; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Limnanthes floccosa ssp. californica | Butte County meadowfoam | Meadowfoam, Butte County | Q2YE | P01 | CA; U.S.A. (CA) | Limnanthaceae | Jun 08, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Limnanthes floccosa ssp. pumila | Dwarf meadowfoam | Meadowfoam, dwarf | Q149 | P01 | OR; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Limnanthes gracilis parishii | Parish's meadowfoam | Meadowfoam, Parish's | Q14A | P01 | CA; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Limnanthes gracilis ssp. gracilis | slender meadowfoam | meadowfoam, slender | Q14B | P01 | OR; | Limnanthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Limnanthes pumila ssp. grandiflora | Large-flowered woolly meadowfoam | meadowfoam, large-flowered woolly | Q2CL | P01 | OR; U.S.A. (OR) | Limnanthaceae | Nov 07, 2002 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Limnanthes vinculans | Sebastopol meadowfoam | Meadowfoam, Sebastopol | Q1Y1 | P01 | CA; U.S.A. (CA) | Limnanthaceae | Dec 02, 1991 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Limnebius aridus | Animas minute moss beetle | Minute moss beetle, animas | I0AC | I01 | NM; | Hydraenidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Limnebius texanus | Texas minute moss beetle | Minute moss beetle, Texas | I0AD | I01 | TX; | Hydraenidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Limnebius utahensis | Utah minute moss beetle | Minute moss beetle, Utah | I0AE | I01 | UT; | Hydraenidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Limnephilus alconura | Klamath limnephilan caddisfly | Caddisfly, Klamath limnephilan | I03Z | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Limnephilus atercus | Fort Dick limnephilus caddisfly | Caddisfly, Fort Dick limnephilus | I03R | I01 | CA, OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1, 8 | US | I | Wherever found |
| Limnodromus griseus | Short-billed Dowitcher | Dowitcher Short-billed | B0JK | V01 | Scolopacidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Limonium carolinianum angustatum | [Unnamed] sea-lavender | Sea-lavender, [unnamed] | Q14C | P01 | FL; | Plumbaginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Limonium limbatum | No common name | No common name | Q2CM | P01 | AZ, NM, TX; | Plumbaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Limosa fedoa | Marbled Godwit | Godwit, Marbled | B0JL | V01 | Scolopacidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Limosella pubiflora | Chiricahua mudwort | Mudwort, Chiricahua | Q14D | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Limotettix sp. | Barrens sedge leafhopper | Leafhopper, Barrens sedge | I0LB | I01 | MD; | Cicadellidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Linanthus arenicola | Sand linanthus | Linanthus, sand | Q2CN | P01 | CA, NV; Mexico (Baja California) | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus bellus | Desert beauty | Desert beauty | Q14E | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus concinnus | [Unnamed] linanthus | Linanthus, [unnamed] | Q3EF | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus harknessii condensatus | Plaskett Meadows linanthus | Linanthus, Plaskett Meadows | Q2UH | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus killipii | Baldwin Lake linanthus | Linanthus, Baldwin Lake | Q2UI | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus maculates | Little San Bernardino Mountains gilia | Gilia, Little San Bernardino Mountains | Q3IR | P01 | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Linanthus nuttallii howellii | Mt. Tedoc linanthus | Linanthus, Mt. Tedoc | Q355 | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Linanthus orcuttii | Orcutt's linanthus | Linanthus, Orcutt's | Q14F | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lindera melissifolia | Pondberry | Pondberry | Q2CO | P01 | AL, AR, GA, MO, MS, NC, SC; U.S.A. (SC, NC, MS, MO, LA, GA, FL, AR, AL) | Lauraceae | Jul 31, 1986 | Flowering Plants | 4 | Endangered | 3, 4 | US | P | Wherever found |
| Lindera subcoriacea | Bog spicebush | spicebush, Bog | Q2UJ | P01 | FL, GA, NC, SC; | Lauraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Linderiella occidentalis | California linderiella | Linderiella, California | K044 | I01 | CA; | Linderiellidae | NA | Crustaceans | 1 | Not Listed | 8 | US | I | Wherever found |
| Linderiella santarosae | Santa Rosa linderiella | linderiella, Santa Rosa | K05Q | I01 | Chirocephalidae | NA | Crustaceans | 1 | Not Listed | NA | US | I | Wherever found | |
| Lindernia monticola | piedmont false pimpernel | False pimpernel, piedmont | Q14G | P01 | AL, GA, NC; | Linderniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Linum arenicola | Sand flax | Flax, sand | Q14H | P01 | FL; and Miami-Dade, FL | Linaceae | Oct 31, 2016 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Linum carteri carteri | Carter's small-flowered flax | Flax, Carter's small-flowered | Q14I | P01 | FL; | Linaceae | Oct 06, 2014 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Linum carteri smallii | [Unnamed] flax | Flax, [unnamed] | Q14J | P01 | FL; | Linaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Linum hudsonioides | Mouse-ear chickweed | Chickweed, mouse-ear | Q0DO | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Linum macrocarpum | [Unnamed] flax | Flax, [unnamed] | Q1Y2 | P01 | AL, MS; | Linaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Linum sulcatum harperi | No common name | No common name | Q14K | P01 | FL; | Linaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Linum westii | West's flax | Flax, West's | Q14L | P01 | FL; | Linaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Liophus ornatus | Maria Island snake | Snake, Maria Island | C056 | V01 | St Lucia (Maria Islands) | Colubridae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lioplax cyclostomaformis | Cylindrical lioplax (snail) | Lioplax, cylindrical (snail) | G072 | I01 | AL; U.S.A. (GA, AL) | Viviparidae | Oct 28, 1998 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Lipochaeta alata alata | [Unnamed] nehe | Nehe, [unnamed] | Q1Y3 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta bryanii | Bryan's nehe | Nehe, Bryan's | Q14M | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta degeneri | Small-leaved nehe | Nehe, small-leaved | Q14N | P01 | HI; Possibly extinct,last observed in 1928. | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta fauriei | Nehe | Nehe | Q1Y4 | P01 | HI; U.S.A. (HI) | Asteraceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lipochaeta heterophylla heterophylla | No common name | No common name | Q2CP | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta integrifolia argentea | No common name | No common name | Q2CQ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta integrifolia gracilis | Nehe | Nehe | Q1Y6 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta integrifolia major | Nehe | Nehe | Q1Y7 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta integrifolia megacephala | Nehe | Nehe | Q1Y8 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum conferta | No common name | No common name | Q2CT | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum hillebrandiana | No common name | No common name | Q2CU | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum longifolia | Nehe | Nehe | Q1Y9 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum maneleana | No common name | No common name | Q2CV | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum ovata | No common name | No common name | Q2CW | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum salicifolia | Nehe | Nehe | Q1YA | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum skottsbergii | Nehe | Nehe | Q1YB | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lavarum stearnsii | No common name | No common name | Q2CX | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lobata lobata | Nehe | Nehe | Q1YD | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta lobata var. leptophylla | Nehe | Nehe | Q1YC | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lipochaeta micrantha | Nehe | Nehe | Q2CY | P01 | HI; U.S.A. (HI) | Asteraceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lipochaeta ovata | No common name | No common name | Q14O | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta perdita | Nehe | Nehe | Q14P | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta profusa profusa | Many-flowered nehe | Nehe, many-flowered | Q1YE | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta profusa robustior | Nehe | Nehe | Q1YF | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta remyi | Remy's nehe | Nehe, Remy's | Q1YG | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta rockii | Rock's nehe | Nehe, Rock's | Q1YH | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta subcordata membranacea | Nehe | Nehe | Q14R | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta succulenta succulenta | Nehe | Nehe | Q1YI | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta tenuis | Nehe | Nehe | Q14S | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lipochaeta venosa | No common name | No common name | Q1YJ | P01 | HI; U.S.A. (HI) | Asteraceae | Nov 29, 1979 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lipochaeta waimeaensis | Nehe | Nehe | Q2D1 | P01 | HI; U.S.A. (HI) | Asteraceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lipotes vexillifer | Chinese River Dolphin | Dolphin, Chinese River | A0FQ | V01 | China | Platanistidae | May 30, 1989 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lirceolus smithii | Texas Troglobitic Water Slater | Slater, Texas Troglobitic Water | K084 | I01 | Asellidae | NA | Crustaceans | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Lirceus culveri | Rye Cove Cave isopod | Isopod, Rye Cove Cave | K02E | I01 | VA; | Asellidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Lirceus usdagalun | Lee County cave isopod | Isopod, Lee County cave | K02C | I01 | VA; U.S.A. (VA) | Asellidae | Nov 20, 1992 | Crustaceans | 5 | Endangered | 5 | US | I | Wherever found |
| Lissemys punctata punctata | Indian flap-shelled turtle | Turtle, Indian flap-shelled | C01N | V01 | Trionychidae | Jun 14, 1976 | Reptiles | Foreign | Original Data in Error - Erroneous Data | NA | Foreign | V | Wherever found | |
| Listera auriculata | Auricled twayblade | Twayblade, auricled | Q14T | P01 | ME, MI, MN, NH, NY, VT, WI; Canada (Lab,N.B,Nfld,Ont,Que.) | Orchidaceae | NA | Flowering Plants | 5 | Not Listed | 3, 5 | US | P | Wherever found |
| Lithasia armigera | Armored rocksnail | Rocksnail, armored | G018 | I01 | AL, IN, KY, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Lithasia curta | Knobby rocksnail | Rocksnail, knobby | G087 | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia duttoniana | Helmet rocksnail | Rocksnail, helmet | G019 | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Lithasia geniculata | Ornate rocksnail | Rocksnail, ornate | G01C | I01 | AL, KY, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia jayana | Rugose rocksnail | Rocksnail, rugose | G01D | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia lima | Warty rocksnail | Rocksnail, warty | G01F | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia pinguis | Small geniculate river snail | Snail, small geniculate river | G03O | I01 | TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia salebrosa | Muddy rocksnail | Rocksnail, muddy | G01A | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Lithasia verrucosa | Varicose rocksnail | Rocksnail, varicose | G01E | I01 | AL, KY, OH, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Lithobates capito | Gopher Frog | Frog, gopher | D046 | V01 | FL, GA, SC; | Ranidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Lithobates onca | Relict leopard Frog | Frog, relict leopard | D00E | V01 | AZ, NV; | Ranidae | NA | Amphibians | 8 | Not Listed | 2, 8 | US | V | Wherever found |
| Lithophane lemmeri | Lemmer's pinnion moth | Moth, Lemmer's pinnion | I0B3 | I01 | CT, DE, FL, MD, NC, NJ, SC, VA; | Noctuidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Lithophragma maximum | San Clemente Island woodland-star | Woodland-star, San Clemente Island | Q14U | P01 | CA; U.S.A. (CA) | Saxifragaceae | Aug 08, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| litodonta alpina | A Notodontid moth | moth, A Notodontid | I0UU | I01 | notodontidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Litsea aestivalis | Pondspice | Pondspice | Q14V | P01 | FL; | Lauraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lobelia appendiculata gattingeri | No common name | No common name | Q14W | P01 | KY, TN; | Campanulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lobelia boykinii | Boykin's lobelia | Lobelia, Boykin's | Q2PM | P01 | FL, GA, SC; | Campanulaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Lobelia dunbariae | No common name | No common name | Q14X | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lobelia hypoleuca rockii | No common name | No common name | Q14Z | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lobelia koolauensis | No common name | No common name | Q14Y | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lobelia monostachya | No common name | No common name | Q2D2 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lobelia niihauensis | No common name | No common name | Q1YK | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lobelia oahuensis | No common name | No common name | Q1YL | P01 | HI; U.S.A. (HI) | Campanulaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lobelia remyi | No common name | No common name | Q1YM | P01 | HI; Believed to be extinct | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| lobelia yuccoides | panaunau | panaunau | Q3JJ | P01 | campanulaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Loeflingia squarrosa artemisiarum | Sage-like loeflingia | Loeflingia, sage-like | Q2D3 | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium attenuatum | No common name | No common name | Q2PN | P01 | WY; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lomatium bradshawii | Bradshaw's desert-parsley | Desert-parsley, Bradshaw's | Q1YN | P01 | OR, WA; U.S.A. (WA, OR) | Apiaceae | Sep 30, 1988 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lomatium concinnum | Adobe desert-parsley | Desert-parsley, adobe | Q2PO | P01 | CO; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lomatium congdonii | Congdon's lomatium | Lomatium, Congdon's | Q150 | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium cookii | Cook's lomatium | Lomatium, Cook's | Q356 | P01 | OR; U.S.A. (OR) | Apiaceae | Nov 07, 2002 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lomatium cuspidatum | No common name | No common name | Q151 | P01 | WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium erythrocarpum | Red-fruited desert-parsley | Desert-parsley, red-fruited | Q357 | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium foeniculaceum inyoense | Inyo lomatium | Lomatium, Inyo | Q152 | P01 | CA, ID; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lomatium graveolens clarkii | [Unnamed] desert-parsley | Desert-parsley, [unnamed] | Q3EG | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lomatium greenmanii | Greenman's desert-parsley | Desert-parsley, Greenman's | Q153 | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium hallii | No common name | No common name | Q2D4 | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium hendersonii | No common name | No common name | Q154 | P01 | OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium howellii | Howell's lomatium | Lomatium, Howell's | Q155 | P01 | CA, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lomatium insulare | San Nicolas Island lomatium | Lomatium, San Nicolas Island | Q3EH | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium laevigatum | No common name | No common name | Q156 | P01 | OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium latilobum | Slickrock desert-parsley | Desert-parsley, Slickrock | Q157 | P01 | CO, UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lomatium minimum | No common name | No common name | Q158 | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lomatium minus | Day Valley desert-parsley | Desert-parsley, Day Valley | Q159 | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium oreganum | No common name | No common name | Q15A | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium peckianum | Peck's lomatium | Lomatium, Peck's | Q15B | P01 | CA, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lomatium quintuplex | No common name | No common name | Q2D5 | P01 | WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium ravenii | Lassen desert-parsley | Desert-parsley, Lassen | Q15C | P01 | CA, ID, NV, OR, UT; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Lomatium rigidum | Big Pine lomatium | Lomatium, Big Pine | Q15D | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium rollinsii | No common name | No common name | Q15E | P01 | ID, OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium serpentinum | No common name | No common name | Q15F | P01 | ID, OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium shevockii | Owens Peak lomatium | Lomatium, Owens Peak | Q358 | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium stebbinsii | Stebbins' lomatium | Lomatium, Stebbins' | Q2PP | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lomatium suksdorfii | Suksdorf's desert-parsley | Desert-parsley, Suksdorf's | Q15G | P01 | OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium thompsonii | No common name | No common name | Q15H | P01 | WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lomatium tuberosum | Hoover's desert-parsley | Desert-parsley, Hoover's | Q15I | P01 | WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lontra (=Lutra) felina | Marine otter | Otter, marine | A05Y | V01 | Peru south to Straits of Magellan; Wherever found | Mustelidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lontra (=Lutra) longicaudis (incl. platensis) | Long-tailed otter | Otter, long-tailed | A05X | V01 | Wherever found | Mustelidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lontra (=Lutra) provocax | Southern river otter | Otter, southern river | A05Z | V01 | Wherever found | Mustelidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lontra canadensis | River otter | Otter, river | A0HY | V01 | Mustelidae | NA | Mammals | 9 | Not Listed | NA | US | V | Wherever found | |
| Lophocolea appalachiana | No common name | No common name | Q359 | P01 | NC, TN; | Geocalycaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lophophorus lhuysii | Chinese monal pheasant | Pheasant, Chinese monal | B03W | V01 | China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lophophorus sclateri | Sclater's monal pheasant | Pheasant, Sclater's monal | B02V | V01 | Myanmar (Burma), India, China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lophura edwardsi | Edward's pheasant | Pheasant, Edward's | B02R | V01 | Vietnam | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lophura imperialis | Imperial pheasant | Pheasant, imperial | B02S | V01 | Vietnam | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lophura swinhoii | Swinhoe's pheasant | Pheasant, Swinhoe's | B02W | V01 | Taiwan | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lorandersonia microcephala | Small-headed goldenweed | Goldenweed, small-headed | Q33V | P01 | CO, NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Lorandersonia salicina | [Unnamed] goldenweed | Goldenweed, [unnamed] | Q0XJ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lordithon niger | Black lordithon rove beetle | Rove beetle, black lordithon | I0CO | I01 | AR, CT, DC, GA, IL, KY, MI, MO, NC, NY, OH, PA, TX, VA, WV; Possibly extinct,not reported since 1965 | Staphylinidae | NA | Insects | 5 | Not Listed | 2, 3, 4, 5 | US/Foreign | I | Wherever found |
| Lorita abornana | Lora Aborn's moth | Moth, Lora Aborn's | I0ID | I01 | CA; | Cochylidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lota lota | Kootenai River burbot | Burbot, Kootenai River | E0A1 | V01 | Gadidae | NA | Fishes | 1 | Not Listed | NA | US | V | Wherever found | |
| Lotus argophyllus adsurgens | Silver, San Clemente Island hosackia | Hosackia, silver, San Clemente Island | Q15J | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lotus argophyllus niveus | Silver, Santa Cruz Island hosackia | Hosackia, silver, Santa Cruz Island | Q15K | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Lotus crassifolius otayensis | Otay lotus | Lotus, Otay | Q35A | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lotus nuttallianus | Prostrate hosackia | Hosackia, prostrate | Q15L | P01 | CA; Mexico (Baja California) | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Lotus purshianus helleri | No common name | No common name | Q35B | P01 | GA, NC, SC, VA; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Lotus rubriflorus | Red-flowered lotus | Lotus, red-flowered | Q35C | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lotus unifoliolatus var. helleri | Heller's bird's-foot trefoil | Trefoil, Heller's bird's-foot | Q3MI | P01 | NC; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Loxia curvirostra | Red crossbill | crossbill, Red | B0FS | V01 | NC; | Fringillidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Loxioides bailleui | Palila (honeycreeper) | Palila (honeycreeper) | B00K | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Loxodonta africana | African elephant | Elephant, African | A07U | V01 | ; Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Congo, Congo (Zaire), Ivory Coast, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Malawi, Mali, Mauritania, Mozambique, Namibia, Niger, Nigeria, Rwanda, Senegal, Sierra Leone, Somalia, South Africa, South Sudan, Swaziland,Tanzania, Togo, Uganda, Zambia, Zimbabwe | Elephantidae | Jun 11, 1978 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Loxops caeruleirostris | Akekee | Akekee | B0AF | V01 | HI; U.S.A. (HI) | Fringillidae | May 13, 2010 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Loxops coccineus | Hawaii akepa | akepa, Hawaii | B044 | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Loxops ochraceus | Maui akepa | akepa, Maui | B045 | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Ludwigia brevipes | Long Beach seedbox | seedbox, Long Beach | Q3PD | P01 | AR, DE, GA, MD, NC, NJ, SC, VA; | Onagraceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Entire |
| Ludwigia ravenii | Raven's seedbox | seedbox, Raven's | Q3PF | P01 | FL, NC, SC, VA; | Onagraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | P | Wherever found |
| Ludwigia spathulata | Spathulate seedbox | seedbox, Spathulate | Q3PE | P01 | AL, FL, GA, SC; | Onagraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Luina serpentina | No common name | No common name | Q15M | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lunania ekmanii | No common name | No common name | Q35D | P01 | PR, VI; | Flacourtiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Luperina trigona | [Unnamed] noctuid moth | Noctuid moth, [unnamed] | I0LD | I01 | TN; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Lupinus antoninus | Anthony Peak lupine | Lupine, Anthony Peak | Q2UK | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus arboreus eximius | Lupine, San Mateo tre | Tre, lupine, San Mateo | Q2PQ | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus aridorum | Scrub lupine | Lupine, scrub | Q2PR | P01 | FL; U.S.A. (FL); Xeric sandy ridges of central Florida | Fabaceae | Apr 07, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Lupinus aridus ssp. ashlandensis | Ashland Lupine | Lupine, Ashland | Q15N | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus burkei caeruleomontanus | No common name | No common name | Q15P | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus caudatus ssp. cutleri | Cutler's spurred lupine | Lupine, Cutler's spurred | Q15T | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lupinus cervinus | Santa Lucia lupine | Lupine, Santa Lucia | Q15Q | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus citrinus | Orange lupine | Lupine, orange | Q15R | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus citrinus deflexus | Mariposa lupine | Lupine, Mariposa | Q15S | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus constancei | The Lassics lupine | Lupine, The Lassics | Q2PS | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Under Review in the Candidate or Petition Process | 8 | US | P | Wherever found |
| Lupinus crassus | No common name | No common name | Q2PT | P01 | CO; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lupinus culbertsonii culbertsonii | Hoskett Meadows lupine | Lupine, Hoskett Meadows | Q2D6 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus cusickii | Cusick's lupine | Lupine, Cusick's | Q2PU | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus dalesiae | Quincy lupine | Lupine, Quincy | Q2D7 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus duranii | Mono Lake lupine | Lupine, Mono Lake | Q15U | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus excubitus medius | Mountains Springs bush lupine | Bush lupine, Mountains Springs | Q2UL | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus guadalupensis | Guadalupe Island lupine | Lupine, Guadalupe Island | Q15V | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Lupinus holmgrenianus | Holmgren's lupine | Lupine, Holmgren's | Q15W | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus inyoensis | Inyo lupine | Lupine, Inyo | Q2D8 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus jonesii | No common name | No common name | Q15X | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lupinus ludovicianus | San Luis lupine | Lupine, San Luis | Q15Y | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus luteolus | Pale yellow lupine | Lupine, Pale yellow | Q15Z | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus magnificus magnificus | Panamint Mountains lupine | Lupine, Panamint Mountains | Q2PV | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus malacophyllus | No common name | No common name | Q2D9 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus montigenus montigenus | No common name | No common name | Q2DA | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus nipomensis | Nipomo Mesa lupine | Lupine, Nipomo Mesa | Q161 | P01 | CA; U.S.A. (CA) | Fabaceae | Mar 20, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lupinus onustus | Plumas lupine | Lupine, Plumas | Q160 | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus oreganus var. oreganus | Biddle's lupine | Lupine, Biddle's | Q15O | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus padre-crowleyi | DeDecker's lupine | Lupine, DeDecker's | Q162 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus peirsonii | Peirson's lupine | Lupine, Peirson's | Q2DB | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus sabinii | No common name | No common name | Q2DC | P01 | OR, WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lupinus sericatus | Cobb Mountain lupine | Lupine, Cobb Mountain | Q163 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus sericeus marianus | No common name | No common name | Q164 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lupinus spectabilis | Shaggy-hair lupine | Lupine, shaggy-hair | Q165 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lupinus sulphureus ssp. kincaidii | Kincaid's Lupine | Lupine, Kincaid's | Q35E | P01 | OR, WA; U.S.A. (WA, OR) | Fabaceae | Jan 25, 2000 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Lupinus tidestromii | Clover lupine | Lupine, clover | Q2DD | P01 | CA; U.S.A. (CA) | Fabaceae | Jun 22, 1992 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Lupinus tracyi | Tracy's lupine | Lupine, Tracy's | Q166 | P01 | CA, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Lupinus westianus | Gulfcoast lupine | Lupine, Gulfcoast | Q167 | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Lutra canadensis sonora | Southwestern otter | Otter, southwestern | A074 | V01 | CO; | Mustelidae | NA | Mammals | 2 | Not Listed | 6 | US | V | Wherever found |
| Luzula hawaiiensis oahuensis | No common name | No common name | Q2DE | P01 | HI; | Juncaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lycaeides argyrognomon lotis | Lotis blue butterfly | Butterfly, lotis blue | I00I | I01 | CA; U.S.A. (CA) | Lycaenidae | Jun 08, 1976 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Lycaeides melissa samuelis | Karner blue butterfly | Butterfly, Karner blue | I00F | I01 | IL, IN, MI, MN, NH, NY, OH, WI; Canada (Ont.); U.S.A. (WI, PA, OH, NY, NH, MN, MI, MA, IN, IL), Canada (Ont.) | Lycaenidae | Dec 14, 1992 | Insects | 3 | Endangered | 3, 5 | US/Foreign | I | Wherever found |
| Lycaena arota nubila | Clouded tailed copper butterfly | Butterfly, clouded tailed copper | I009 | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lycaena dorcas claytoni | Clayton's copper | Copper, Clayton's | I05B | I01 | ME; | Lycaenidae | NA | Insects | 5 | Not Listed | 5 | US/Foreign | I | Wherever found |
| lycaena ferrisi | ferris's copper | No common name | I0UQ | I01 | lycaenidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Lycaena hermes | Hermes copper butterfly | Butterfly, Hermes copper | I05C | I01 | CA; | Lycaenidae | NA | Insects | 8 | Candidate | 8 | US/Foreign | I | Wherever found |
| Lycaena rubicus ssp. | White Mountains copper | Copper, White Mountains | I0N9 | I01 | CA, NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lycaon pictus | African wild dog | Dog, African wild | A0A1 | V01 | Canidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Lycium hassei | Santa Catalina Island desert-thorn | Desert-thorn, Santa Catalina Island | Q168 | P01 | CA; Believed to be extinct | Solanaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lycium puberulum berberioides | Silver wolfberry | Wolfberry, silver | Q169 | P01 | TX; | Solanaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lycium texanum | Texas wolfberry | Wolfberry, Texas | Q16A | P01 | TX; | Solanaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lycium verrucosum | San Nicolas Island desert-thorn | Desert-thorn, San Nicolas Island | Q16B | P01 | CA; Believed to be extinct | Solanaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| lycopodium phlegmaria var. | disciplina | disciplina | Q3JB | P01 | lycopodiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Lycosa ericeticola | Rosemary wolf spider | Spider, Rosemary wolf | J004 | I01 | FL; | Lycosidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Lygodesmia doloresensis | Dolores desert pink | Desert pink, Dolores | Q2PW | P01 | CO, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lygodesmia entrada | Entrada skeletonplant | Skeletonplant, Entrada | Q2UM | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lygodesmia grandiflora stricta | No common name | No common name | Q16E | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Lynx (=Felis) rufus escuinapae | Mexican bobcat | Bobcat, Mexican | A04S | V01 | Central Mexico; Entire | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Lynx canadensis | Canada Lynx | Lynx, Canada | A073 | V01 | CO, ID, ME, MI, MN, MT, NH, NM, OR, UT, VT, WA, WI, WY; U.S.A. (CO, ID, ME, MI, MN, MT, NH, NY, OR, UT, VT, WA, WI, WY) | Felidae | Mar 24, 2000 | Mammals | 6 | Threatened | 1, 2, 3, 5, 6 | US | V | Wherever Found in Contiguous U.S. |
| Lynx rufus | Bobcat | Bobcat | A0HX | V01 | Felidae | NA | Mammals | NA | Not Listed | NA | V | Wherever found | ||
| Lyogyrus sp | Columbia Duskysnail | Duskysnail, Columbia | G0EM | I01 | Hydrobiidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Lyogyrus spb | Masked duskysnail | Duskysnail, masked | G0EY | I01 | WA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Lyogyrus spc | Canary duskysnail | Duskysnail, canary | G0EZ | I01 | CA; | Hydorbiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Lyonia truncata var. proctorii | No common name | No common name | Q35F | P01 | PR; Endemic to Sierra Bermeja, Puerto Rico; U.S.A. (PR). Endemic to Sierra Bermeja, located in the southwest corner of Puerto Rico. | Ericaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Lyonothamnus floribundus asplenifolius | Fern-leaved ironwood | Ironwood, fern-leaved | Q2PX | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lyonothamnus floribundus floribundus | Catalina ironwood | Ironwood, Catalina | Q2PY | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Lysiloma microphylla thornberi | No common name | No common name | Q2UN | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lysimachia asperulaefolia | Rough-leaved loosestrife | Loosestrife, rough-leaved | Q2DF | P01 | NC, SC; U.S.A. (SC, NC) | Primulaceae | Jun 12, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Lysimachia daphnoides | lehua makanoe | lehua makanoe | Q35G | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia filifolia | No common name | No common name | Q2DG | P01 | HI; U.S.A. (HI) | Primulaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia forbesii | No common name | No common name | Q35H | P01 | HI; Believed to be extinct | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lysimachia fraseri | Fraser's yellow loosestrife | Loosestrife, Fraser's yellow | Q35I | P01 | CO, NC; | Primulaceae | NA | Flowering Plants | 4 | Not Listed | 4, 6 | US | P | Wherever found |
| Lysimachia hillebrandii | Pua-hekili | Pua-hekili | Q16F | P01 | HI; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lysimachia hybrida | Fringed loosestrife | Loosestrife, fringed | Q21Y | P01 | AL, AZ, CO, CT, FL, ID, KS, MA, ME, MT, NH, NM, OR, RI, TX, VT, WA; | Primulaceae | NA | Flowering Plants | 5 | Not Listed | 1, 2, 4, 5, 6 | US | P | Wherever found |
| Lysimachia iniki | No common name | No common name | Q3MX | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia kalalauensis | No common name | No common name | Q16G | P01 | HI; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lysimachia lydgatei | No common name | No common name | Q35J | P01 | HI; U.S.A. (HI) | Primulaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia maxima | No common name | No common name | Q35K | P01 | HI; U.S.A. (HI) | Primulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia pendens | No common name | No common name | Q3MY | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia scopulensis | No common name | No common name | Q3MZ | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lysimachia sp. | Sp. nov. ined. lysimachia | Lysimachia, sp. nov. ined. | Q35L | P01 | HI; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Lysimachia sp. nov. ined. | Sp. nov. ined. (Waihoi Valley) lysimachia | Lysimachia, sp. nov. ined. (Waihoi Valley) | Q16H | P01 | HI; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Waihoi Valley |
| Lysimachia venosa | No common name | No common name | Q3H4 | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Lythrum curtissii | Curtiss' loosestrife | loosestrife, Curtiss' | Q2UO | P01 | FL, GA; | Lythraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Lythrum flagellare | Florida loosestrife | loosestrife, Florida | Q2UP | P01 | FL; | Lythraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Lythrum ovalifolium | No common name | No common name | Q16I | P01 | TX; | Lythraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Lythrurus snelsoni | Ouachita Mountain shiner | Shiner, Ouachita Mountain | E06S | V01 | AR, OK; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2, 4 | US | V | Wherever found |
| Lytrosis permagnaria | [Unnamed] looper moth | Looper moth, [unnamed] | I0LE | I01 | GA, KY, MO, MS, TN; | Geometridae | NA | Insects | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Lytta hoppingi | Hopping's blister beetle | Blister beetle, Hopping's | I02G | I01 | CA; | Meloidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lytta inseparata | Mojave Desert blister beetle | Blister beetle, Mojave Desert | I02H | I01 | CA; Possibly extinct,not reported since 1965 | Meloidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lytta mirifica | Anthony blister beetle | Blister beetle, Anthony | I02I | I01 | NM; | Meloidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Lytta moesta | Moestan blister beetle | Blister beetle, moestan | I02J | I01 | CA; Possibly extinct,not reported since 1965 | Meloidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lytta molesta | Molestan blister beetle | Blister beetle, molestan | I02K | I01 | CA; | Meloidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Lytta morrisoni | Morrison's blister beetle | Blister beetle, Morrison's | I02L | I01 | CA; | Meloidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Macaca arctoides | Stump-tailed macaque | Macaque, stump-tailed | A06M | V01 | India (Assam) to southern China | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Macaca cyclopis | Formosan rock macaque | Macaque, Formosan rock | A06K | V01 | Entire | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Macaca fuscata | Japanese macaque | Macaque, Japanese | A06L | V01 | Japan (Shikoku,Kyushu and Honshu Islands) | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Macaca silenus | Lion-tailed macaque | Macaque, lion-tailed | A01N | V01 | India | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macaca sinica | Toque macaque | Macaque, Toque | A06N | V01 | Sri Lanka | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Macbridea alba | White birds-in-a-nest | Birds-in-a-nest, white | Q1YP | P01 | FL; U.S.A. (FL) | Lamiaceae | May 08, 1992 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Macbridea caroliniana | Carolina birds-in-a-nest | Birds-in-a-nest, Carolina | Q35M | P01 | AL, FL, GA, NC, SC; | Lamiaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Machaeranthera asteroides lagunensis | Laguna Mountains aster | Aster, Laguna Mountains | Q16J | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Machaeranthera canescens ziegleri | Ziegler's aster | Aster, Ziegler's | Q2DH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Machaeranthera grindelioides depressa | No common name | No common name | Q2DI | P01 | AZ, NV, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Machaeranthera gypsitherma | No common name | No common name | Q16L | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Machaeranthera laetevirens | No common name | No common name | Q35O | P01 | ID, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Machiloides perkinsi | Perkin's club-palp bristletail | Bristletail, Perkin's club-palp | I02R | I01 | HI; | Machilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Macrhybopsis australis | prairie chub | Chub, prairie | E0BE | V01 | OK, TX; U.S.A. (OK, TX) | Cyprinidae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Macrhybopsis gelida | Sturgeon chub | Chub, sturgeon | E05O | V01 | AR, IA, IL, KS, KY, LA, MO, MS, MT, ND, NE, SD, TN, WY; | Cyprinidae | NA | Fishes | 6 | Under Review in the Candidate or Petition Process | 3, 4, 6 | US | V | Wherever found |
| Macrhybopsis meeki | Sicklefin chub | Chub, sicklefin | E05N | V01 | AR, IA, IL, KS, KY, LA, MO, MS, MT, ND, NE, SD, TN; | Cyprinidae | NA | Fishes | 6 | Under Review in the Candidate or Petition Process | 3, 4, 6 | US | V | Wherever found |
| Macrhybopsis tetranema | Peppered chub | chub, Peppered | E072 | V01 | CO, KS, NM, OK, TX; | Cyprinidae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2, 6 | US | V | Wherever found |
| Macrobaenetes kelsoensis | Kelso giant sand treader cricket | Cricket, Kelso giant sand treader | I05K | I01 | CA; | Rhaphidophoridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Macrobaenetes valgum | Coachella giant sand treader cricket | Cricket, Coachella giant sand treader | I05G | I01 | CA; | Rhaphidophoridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Macrocephalon maleo | Maleo megapode | Megapode, Maleo | B023 | V01 | Indonesia (Celebes) | Megapodiidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macrochelys temminckii | Alligator snapping turtle | Turtle, alligator snapping | C045 | V01 | FL, GA; | Chelydridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Macromia margarita | Margarita River skimmer | Skimmer, Margarita River | I0OA | I01 | GA, NC, SC, TN, VA; | Macromiidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Macromia taeniolata | Wabash belted skimmer | Skimmer, Wabash belted | I0DP | I01 | IN, OH, TX; Possibly extinct,not reported since 1965 | Macromiidae | NA | Insects | 3 | Not Listed | 2, 3 | US | I | Wherever found |
| Macropus fuliginosus | Western gray kangaroo | Kangaroo, western gray | A04I | V01 | Macropodidae | Dec 30, 1974 | Mammals | Foreign | Recovery | NA | Foreign | V | Wherever found | |
| Macropus giganteus | Eastern gray kangaroo | Kangaroo, eastern gray | A04G | V01 | Macropodidae | Dec 30, 1974 | Mammals | Foreign | Recovery | NA | Foreign | V | Wherever found | |
| Macropus giganteus tasmaniensis | Tasmanian forester kangaroo | Kangaroo, Tasmanian forester | A047 | V01 | Australia (Tasmania) | Macropodidae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macropus parma | Parma wallaby | Wallaby, Parma | A03S | V01 | Australia | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macropus rufus | Red kangaroo | Kangaroo, red | A04H | V01 | Macropodidae | Dec 30, 1974 | Mammals | Foreign | Recovery | NA | Foreign | V | Wherever found | |
| Macrotis lagotis | Rabbit bandicoot | Bandicoot, rabbit | A031 | V01 | Entire | Peramelidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macrotis leucura | Lesser rabbit bandicoot | Bandicoot, lesser rabbit | A02Z | V01 | Entire | Peramelidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Macrotus californicus | California leaf-nosed bat | Bat, California leaf-nosed | A0FU | V01 | AZ, CA; | Phyllostomidae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Madia hallii | Hall's madia | Madia, Hall's | Q2PZ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| madia radiata | Showy madia | madia, Showy | Q3K6 | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Madia stebbinsii | Stebbins' madia | Madia, Stebbins' | Q2UQ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Maesa walkeri | No common name | No common name | Q3OY | P01 | GU, MP; | Myrsinaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Magnolia ashei | Ashe's magnolia | Magnolia, Ashe's | Q16P | P01 | FL; | Magnoliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Malaclemys terrapin littoralis | Texas diamondback terrapin | Terrapin, Texas diamondback | C05L | V01 | LA, TX; | Emydidae | NA | Reptiles | 2 | Not Listed | 2, 4 | US | V | Wherever found |
| Malaclemys terrapin pileata | Mississippi diamondback terrapin | Terrapin, Mississippi diamondback | C063 | V01 | AL, FL, GA, LA, MS; | Emydidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Malaclemys terrapin terrapin | Northern diamondback terrapin | Terrapin, northern diamondback | C054 | V01 | CT, DE, MA, MD, NC, NJ, NY, RI, VA; | Emydidae | NA | Reptiles | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Malaconotus alius | Ulugura bush-shrike | Bush-shrike, Ulugura | B09L | V01 | Tanzania | Laniidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Malacothamnus abbottii | Abbott's bush-mallow | Bush-mallow, Abbott's | Q16Q | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| malacothamnus arcuatus | Arcuate bush mallow | bush mallow, Arcuate | Q3KA | P01 | malvaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Malacothamnus clementinus | San Clemente Island bush-mallow | Bush-mallow, San Clemente Island | Q1YR | P01 | CA; U.S.A. (CA) | Malvaceae | Sep 12, 1977 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Malacothamnus davidsonii | Davidson's bush-mallow | Bush-mallow, Davidson's | Q35P | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothamnus fasciculatus var. nesioticus | Santa Cruz Island bush-mallow | Bush-mallow, Santa Cruz Island | Q16R | P01 | CA; U.S.A. (CA) | Malvaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Malacothamnus mendocinensis | Mendocino bush-mallow | Bush-mallow, Mendocino | Q16S | P01 | CA; Possibly extinct | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothamnus palmeri involucratus | Carmel Valley bush-mallow | Bush-mallow, Carmel Valley | Q16T | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothamnus palmeri lucianus | Arroyo Seco bush-mallow | Bush-mallow, Arroyo Seco | Q16U | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothamnus palmeri palmeri | Palmer's bush-mallow | Bush-mallow, Palmer's | Q16W | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothamnus parishii | Parish's bush-mallow | Bush-mallow, Parish's | Q16V | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothrix crispifolia | No common name | No common name | Q3EI | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothrix indecora | Santa Cruz Island malacothrix | Malacothrix, Santa Cruz Island | Q35Q | P01 | CA; U.S.A. (CA) | Asteraceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Malacothrix intermedia | No common name | No common name | Q3EJ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothrix saxatilis arachnoidea | Carmel Valley malacothrix | Malacothrix, Carmel Valley | Q16X | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malacothrix squalida | Island malacothrix | Malacothrix, island | Q3EK | P01 | CA; U.S.A. (CA) | Asteraceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Malaxis bayardii | Appalachian Adder's-mouth | Adder's-mouth, Appalachian | Q3SJ | P01 | NC; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Malaxis brachypoda | Adder's-mouth | Adder's-mouth | Q3EL | P01 | CA; | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Malimbus ibadanensis | Ibadan malimbe | Malimbe, Ibadan | B09U | V01 | Nigeria | Ploceidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Malpighia infestissima | Stingingbush | Stingingbush | Q2UR | P01 | VI; | Malpighiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Malvastrum hispidum | No common name | No common name | Q3EM | P01 | AL, IL, KS, KY, MO, NE, TN; | Malvaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 6 | US | P | Wherever found |
| Mammillaria thornberi | No common name | No common name | Q16Z | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Mammillaria viridiflora | Greenflower nipple cactus | Cactus, Greenflower nipple | Q16Y | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Mandrillus (=Papio) leucophaeus | Drill | Drill | A06F | V01 | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Mandrillus (=Papio) sphinx | Mandrill | Mandrill | A06O | V01 | Equatorial West Africa | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Manduca blackburni | Blackburn's sphinx moth | Moth, Blackburn's sphinx | I0AL | I01 | HI; U.S.A. (HI) | Sphingidae | Feb 01, 2000 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Manfreda longiflora | Runyon huaco | Huaco, Runyon | Q170 | P01 | TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Manfreda maculosa | No common name | No common name | Q171 | P01 | TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Manihot davisiae | No common name | No common name | Q172 | P01 | AZ; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Manihot walkerae | Walker's manioc | Manioc, Walker's | Q1YS | P01 | TX; U.S.A. (TX), Mexico | Euphorbiaceae | Oct 02, 1991 | Flowering Plants | 2 | Endangered | 2 | US/Foreign | P | Wherever found |
| Manis crassicaudata | Indian pangolin | pangolin, Indian | A0L3 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis culionensis | Philippine pangolin | pangolin, Philippine | A0L5 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis gigantea | Giant pangolin | pangolin, Giant | A0L2 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis javanica | Sunda pangolin | pangolin, Sunda | A0L6 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis pentadactyla | Chinese pangolin | pangolin, Chinese | A0L1 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis temminckii | Temnick''s ground Pangolin | Pangolin, Temnick''s ground | A060 | V01 | Wherever found | Manidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Manis tetradactyla | Long-tailed pangolin | pangolin, Long-tailed | A0L4 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Manis tricuspis | Tree pangolin | pangolin, Tree | A0L7 | V01 | Manidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Mappia racemosa | No common name | No common name | Q3EN | P01 | PR, VI; Greater Antilles,Guatemala,Panama | Icacinaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Margaritifera hembeli | Louisiana pearlshell | Pearlshell, Louisiana | F02C | I01 | AR, LA; Current range known within head water streams on the Catahoula Ranger District and the Evangeline Unit, Calcasieu Ranger District of Kisatchie National Forest and adjacent private lands/in-holdings in Grant and Rapides Parishes, Louisiana. ; U.S.A. (LA) | Unionidae | Feb 05, 1988 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Margaritifera marrianae | Alabama pearlshell | Pearlshell, Alabama | F01W | I01 | AL; U.S.A. (AL) | Margaritiferidae | Oct 10, 2012 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Marina orcuttii orcuttii | California marina | Marina, California | Q2UT | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Marlierea sintenisii | Murta | Murta | Q174 | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Marmota flaviventris notioros | Wet Mountains yellow-bellied marmot | Marmot, Wet Mountains yellow-bellied | A0BB | V01 | CO; | Sciuridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Marmota vancouverensis | Vancouver Island marmot | Marmot, Vancouver Island | A0A3 | V01 | Canada (Vancouver Island) | Sciuridae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Marsdenia elliptica | No common name | No common name | Q175 | P01 | PR, VI; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Marshallia grandiflora | Large-flowered Barbara's buttons | Barbara's buttons, large-flowered | Q2Q1 | P01 | NC; | Asteraceae | NA | Flowering Plants | 5 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Marshallia mohrii | Mohr's Barbara's buttons | Barbara's Buttons, Mohr's | Q1YT | P01 | AL, GA; U.S.A. (GA, AL) | Asteraceae | Sep 07, 1988 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Marshallia ramosa | No common name | No common name | Q176 | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Marsilea villosa | Ihi`ihi | Ihi`ihi | S00U | P01 | HI; U.S.A. (HI) | Marsileaceae | Jun 22, 1992 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Marstonia agarhecta | Ocmulgee marstonia | marstonia, Ocmulgee | G0GE | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Marstonia castor | Beaverpond marstonia | marstonia, Beaverpond | G0GF | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| marstonia comalensis | comal siltsnail | No common name | F04C | I01 | hydrobiidae | NA | Clams | 2 | Not Listed | NA | US | I | Wherever found | |
| Martes americana americana | Eastern marten | Marten, eastern | A072 | V01 | MA, ME, MI, ND, NH, NY, OH, PA, VT, WI; | Mustelidae | NA | Mammals | 5 | Not Listed | 3, 5, 6 | US/Foreign | V | Wherever found |
| Martes caurina ssp. humboldtensis | Humboldt Marten | Marten, Humboldt | A0JI | V01 | CA; | Mustelidae | NA | Mammals | 8 | Proposed Threatened | 8 | US | V | Wherever found |
| Martes flavigula chrysospila | Formosan yellow-throated marten | Marten, Formosan yellow-throated | A01R | V01 | Entire | Mustelidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Masticophis flagellum ruddocki | San Joaquin whipsnake | Whipsnake, San Joaquin | C066 | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| masticophis flagellum ssp. piceus | Red coachwhip | coachwhip, Red | C070 | V01 | colubridae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Masticophis lateralis euryxanthus | Alameda whipsnake (=striped racer) | Whipsnake (=striped racer), Alameda | C04A | V01 | CA; U.S.A. (CA) | Colubridae | Dec 05, 1997 | Reptiles | 8 | Threatened | 8 | US | V | Wherever found |
| Matelea alabamensis | [Unnamed] anglepod | Anglepod, [unnamed] | Q177 | P01 | FL; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Matelea baldwyniana | [Unnamed] anglepod | Anglepod, [unnamed] | Q35U | P01 | FL; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Matelea brevicoronata | No common name | No common name | Q178 | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Matelea edwardsensis | Plateau milkvine | Milkvine, plateau | Q179 | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Matelea floridana | No common name | No common name | Q17A | P01 | FL; | Asclepiadaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Matelea parviflora | No common name | No common name | Q17B | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Matelea radiata | Falfurrias anglepod | Anglepod, Falfurrias | Q17C | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Matelea texensis | Texas milkvine | Milkvine, Texas | Q17D | P01 | TX; | Asclepiadaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Maytenus cymosa | No common name | No common name | Q17E | P01 | PR, VI; | Celastraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Maytenus elongata | Cuero de sapo | Cuero de sapo | Q17F | P01 | PR, VI; | Celastraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Maytenus ponceana | Cuero de sapo | Cuero de sapo | Q17G | P01 | PR, VI; | Celastraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Meconella oregana | White fairypoppy | Fairypoppy, White | Q3EO | P01 | WA; | Fumariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Meda fulgida | Spikedace | Spikedace | E05J | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Cyprinidae | Jul 01, 1986 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Medionidus acutissimus | Alabama moccasinshell | Moccasinshell, Alabama | F038 | I01 | AL, GA, MS, TN; U.S.A. (MS, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Medionidus conradicus | Cumberland moccasinshell | moccasinshell, Cumberland | F04W | I01 | AL, GA, KY, NC, TN, VA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Medionidus parvulus | Coosa moccasinshell | Moccasinshell, Coosa | F039 | I01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Medionidus penicillatus | Gulf moccasinshell | Moccasinshell, Gulf | F03M | I01 | AL, FL, GA; U.S.A. (GA, FL, AL) | Unionidae | Mar 16, 1998 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Medionidus simpsonianus | Ochlockonee moccasinshell | Moccasinshell, Ochlockonee | F03N | I01 | FL, GA; U.S.A. (GA, FL) | Unionidae | Mar 16, 1998 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Medionidus walkeri | Suwannee moccasinshell | Moccasinshell, Suwannee | F03T | I01 | FL, GA; | Unionidae | Nov 07, 2016 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Megaceros aenigmaticus | Hornwort | Hornwort | S02V | P01 | GA, NC, TN; | Fissidentaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Entire |
| Megadyptes antipodes | yellow-eyed penguin | penguin, yellow-eyed | B0FL | V01 | New Zealand, South Island and offshore Islands | Spheniscidae | Sep 02, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Megalagrion adytum | Adytum megalagrion damselfly | Damselfly, adytum megalagrion | I05S | I01 | HI; | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion amaurodytum fallax | Fallax megalagrion damselfly | Damselfly, fallax megalagrion | I05W | I01 | HI; | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion amaurodytum peles | Pele megalagrion damselfly | Damselfly, Pele megalagrion | I065 | I01 | HI; Possibly extinct,not reported since 1965 | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion amaurodytum waianaeanum | Waianae megalagrion damselfly | Damselfly, Waianae megalagrion | I067 | I01 | HI; Possibly extinct,not reported since 1965 | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion jugorum | Jugorum megalagrion damselfly | Damselfly, jugorum megalagrion | I05Y | I01 | HI; Believed to be extinct | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion leptodemas | Crimson Hawaiian damselfly | Damselfly, crimson Hawaiian | I05V | I01 | HI; U.S.A. (HI) | Coenagrionidae | Oct 18, 2012 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megalagrion molokaiense | Molokai megalagrion damselfly | Damselfly, Molokai megalagrion | I05Z | I01 | HI; | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion nesiotes | Flying earwig Hawaiian damselfly | Damselfly, flying earwig Hawaiian | I05X | I01 | HI; U.S.A. (HI) | Coenagrionidae | Jul 26, 2010 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megalagrion nigrohamatum nigrohamatum | Nigrohamatum megalagrion damselfly | Damselfly, nigrohamatum megalagrion | I060 | I01 | HI; | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion nigrohamatum nigrolineatum | Blackline Hawaiian damselfly | Damselfly, blackline Hawaiian | I05U | I01 | HI; U.S.A. (HI) | Coenagrionidae | Oct 18, 2012 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megalagrion oahuense | Oahu megalagrion damselfly | Damselfly, Oahu megalagrion | I061 | I01 | HI; | Coenagrionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Megalagrion oceanicum | Oceanic Hawaiian damselfly | Damselfly, oceanic Hawaiian | I062 | I01 | HI; U.S.A. (HI) | Coenagrionidae | Oct 18, 2012 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megalagrion pacificum | Pacific Hawaiian damselfly | Damselfly, Pacific Hawaiian | I064 | I01 | HI; U.S.A. (HI) | Coenagrionidae | Jul 26, 2010 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megalagrion xanthomelas | Orangeblack Hawaiian damselfly | Damselfly, orangeblack Hawaiian | I063 | I01 | HI; | Coenagrionidae | Oct 31, 2016 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Megaleuctra sierra | Shirttail Creek stonefly | Stonefly, Shirttail Creek | I0M6 | I01 | CA; | Leuctridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Megaleuctra williamsae | Smokies needlefly | needlefly, Smokies | I0X7 | I01 | NC, SC, TN, VA; | Leuctridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Megalonaias nicklineana | Nicklin's pearlymussel | Pearlymussel, Nicklin's | F00Y | I01 | Mexico | Unionidae | Jun 14, 1976 | Clams | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Megapodius laperouse | Micronesian megapode | Megapode, Micronesian | B00T | V01 | GU, MP, PW; West Pacific Ocean—Palau Islands, U.S.A. (Mariana Islands) | Megapodiidae | Jun 02, 1970 | Birds | 1 | Endangered | 1 | US/Foreign | V | Wherever found |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V01 | AL, CA, GA, MS, WA; Wherever found | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Not Listed | 1, 4, 8 | US/Foreign | V | Wherever found |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V02 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | US/Foreign | V | West Indies DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V03 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Cape Verde Island/Northwest Africa | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V04 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Western North Pacific | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V05 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | US/Foreign | V | Hawaii DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V06 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Threatened | NA | US/Foreign | V | Mexico DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V07 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Central America DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V08 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | Brazil DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V09 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | Gabon/Southwest Africa DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V10 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | Southeast Africa/Madagascar DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V11 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | West Australia DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V12 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | East Australia DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V13 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | US/Foreign | V | Oceania DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V14 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Recovery | NA | Foreign | V | Southeastern Pacific DPS | |
| Megaptera novaeangliae | Humpback whale | Whale, humpback | A02Q | V15 | Balaenopteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Arabian Sea DPS | |
| Megascolides macelfreshi | Oregon giant earthworm | Earthworm, Oregon giant | L000 | I01 | OR; | Megascolecidae | NA | Annelid Worms | 1 | Not Listed | 1 | US | I | Wherever found |
| Megathymus coloradensis kendalli | Kendall's yucca skipper butterfly | Butterfly, Kendall's yucca skipper | I00G | I01 | TX; | Megathymidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| megomphix hemphilli | Oregon megomphix | megomphix, Oregon | G0CD | I01 | megophicidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Melamprosops phaeosoma | Po`ouli (honeycreeper) | Po`ouli (honeycreeper) | B04N | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 28, 1975 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Melanerpes lewis | Lewis's Woodpecker | Woodpecker, Lewis's | B0HQ | V01 | Picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Melanerpes uropygialis | Gila Woodpecker | Woodpecker, Gila | B0EH | V01 | Piciadae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Melanochelys tricarinata | Three-keeled Asian turtle | Turtle, three-keeled Asian | C01L | V01 | Central India; Central India to Bangladesh and Burma (Myanmar) | Emydidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Melanoplus missoulae | No common name | No common name | I0V9 | I01 | Acrididae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| melanoplus species | No common name | No common name | I0UZ | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciesfiftytwo | No common name | No common name | I0VH | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciesforty-eight | No common name | No common name | I0VG | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciessixtytwo | No common name | No common name | I0VI | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciesthirtysix | No common name | No common name | I0VF | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciestwentysix | No common name | No common name | I0VE | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| melanoplus speciestwentytwo | No common name | No common name | I0VD | I01 | acrididae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Melanosuchus niger | Black caiman | Caiman, black | C00Y | V01 | Amazon Basin | Alligatoridae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Melanthera integrifolia | No common name | No common name | Q2CZ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melanthera kamolensis | nehe | nehe | Q2CS | P01 | HI; U.S.A. (HI) | Asteraceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melanthera parvifolia | No common name | No common name | Q17H | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Melanthera populifolia | No common name | No common name | Q2CR | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melanthera populifolia | Flexuous nehe | Nehe, flexuous | Q1Y5 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melanthera subcordata | Nehe | Nehe | Q14Q | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melanthera tenuifolia | Nehe | Nehe | Q2D0 | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope adscendens | Alani | Alani | Q35V | P01 | HI; U.S.A. (HI) | Rutaceae | Dec 05, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope balloui | Alani | Alani | Q1YU | P01 | HI; U.S.A. (HI) | Rutaceae | Dec 05, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope christophersenii | Alani | Alani | Q1YV | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope cinerea | Manena | Manena | Q1YW | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope clusiifolia | No common name | No common name | Q36R | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope cruciata | Alani | Alani | Q35W | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope degeneri | Alani | Alani | Q1YX | P01 | HI; U.S.A. (HI) | Rutaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope haleakalae | Alani | Alani | Q35X | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope haupuensis | Alani | Alani | Q1YY | P01 | HI; U.S.A. (HI) | Rutaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope hawaiensis | Alani | Alani | Q17I | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope hiiakae | Koolau Range melicope | Melicope, Koolau Range | Q1CG | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope hiiakae | Alani | Alani | Q2DJ | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope hosakae | Honolulu melicope | Melicope, Honolulu | Q1CH | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope kavaiensis | Alani | Alani | Q17J | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope knudsenii | Alani | Alani | Q1YZ | P01 | HI; U.S.A. (HI) | Rutaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope lydgatei | Alani | Alani | Q1Z0 | P01 | HI; U.S.A. (HI) | Rutaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope macropus | Alani | Alani | Q1Z1 | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope makahae | Alani | Alani | Q1Z2 | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope mucronulata | Alani | Alani | Q1Z3 | P01 | HI; U.S.A. (HI) | Rutaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope munroi | Alani | Alani | Q1Z4 | P01 | HI; U.S.A. (HI) | Rutaceae | Sep 03, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope nealae | Alani | Alani | Q1Z5 | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope obovata | Alani | Alani | Q1Z6 | P01 | HI; Believed to be extinct | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope orbicularis | Alani | Alani | Q17K | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope ovalis | Alani | Alani | Q1Z7 | P01 | HI; U.S.A. (HI) | Rutaceae | Dec 05, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope ovata | Alani | Alani | Q17L | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope pallida | Alani | Alani | Q1Z8 | P01 | HI; U.S.A. (HI) | Rutaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope paniculata | Alani | Alani | Q1Z9 | P01 | HI; U.S.A. (HI) | Rutaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope peduncularis | Boxfruit alani | Alani, Boxfruit | Q1CT | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope pseudoanisata | No common name | No common name | Q36S | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope puberula | Alani | Alani | Q35Y | P01 | HI; U.S.A. (HI) | Rutaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope quadrangularis | Alani | Alani | Q1ZA | P01 | HI; U.S.A. (HI) | Rutaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope radiata | Kapu melicope | Melicope, Kapu | Q1CJ | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope reflexa | Alani | Alani | Q1ZB | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope saint-johnii | Alani | Alani | Q17M | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melicope sandwicensis | Alani | Alani | Q17N | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope volcanica | Volcanic melicope | Melicope, Volcanic | Q1CK | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope wailauensis | Alani | Alani | Q35Z | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope wawraeana | No common name | No common name | Q1CS | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope wawraeana | No common name | No common name | Q1CI | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Melicope zahlbruckneri | Alani | Alani | Q1ZC | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Melongena sprucecreekensis | Spruce Creek snail | Snail, Spruce Creek | G046 | I01 | FL; | Melongenidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Melospiza lincolnii | Lincoln's Sparrow | Sparrow, Lincoln's | B0G1 | V01 | Fringillidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Melospiza melodia amaka | Amak song sparrow | Sparrow, Amak song | B06L | V01 | AK; | Emberizidae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Melospiza melodia graminea | Santa Barbara song sparrow | Sparrow, Santa Barbara song | B089 | V01 | CA; Believed to be extinct | Emberizidae | Jun 04, 1973 | Birds | 8 | Extinction | 8 | US | V | Wherever found |
| Melospiza melodia maxillaris | Song Sparrow | Sparrow, Song | B08R | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Melospiza melodia pusillula | Song Sparrow | Sparrow, Song | B08P | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Melospiza melodia samuelis | Song Sparrow | Sparrow, Song | B08Q | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Menidia extensa | Waccamaw silverside | Silverside, Waccamaw | E01P | V01 | NC; U.S.A. (NC) | Atherinidae | Apr 08, 1987 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Mentzelia albicaulis | White-stemmed evening-star | Evening-star, White-stemmed | Q3IG | P01 | Loasaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Mentzelia argillosa | Clay blazing-star | Blazing-star, clay | Q17O | P01 | CO, UT; | Loasaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mentzelia densa | Royal Gorge stickleaf | Stickleaf, Royal Gorge | Q2Q2 | P01 | CO; | Loasaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mentzelia goodrichii | Goodrich's Blazingstar | Blazingstar Goodrich's | Q3M7 | P01 | Loasaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Mentzelia hirsutissima stenophylla | Hairy stickleaf | Stickleaf, hairy | Q17P | P01 | CA; | Loasaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mentzelia leucophylla | Ash Meadows blazingstar | Blazingstar, Ash Meadows | Q1ZD | P01 | NV; U.S.A. (NV) | Loasaceae | May 20, 1985 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| mentzelia memorabalis | september 11 stickleaf | No common name | Q3LH | P01 | loasaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Mentzelia mollis | Smooth stickleaf | Stickleaf, smooth | Q17Q | P01 | ID, NV, OR; | Loasaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Mentzelia multicaulis labrina | No common name | No common name | Q360 | P01 | UT; | Loasaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mentzelia nitens leptocaulis | [Unnamed] stickleaf | Stickleaf, [unnamed] | Q17R | P01 | AZ; Believed to be extinct | Loasaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Mentzelia packardiae | Packard's stickleaf | Stickleaf, Packard's | Q17S | P01 | NV, OR; | Loasaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Mentzelia shultziorum | No common name | No common name | Q361 | P01 | UT; | Loasaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mergus octosetaceus | Brazillian merganser | Merganser, Brazillian | B0BZ | V01 | Paraguay, Brazil, Argentina | Anatidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Merolonche dolli | Doll's merolonche | Merolonche, Doll's | I0PP | I01 | DE, MI, MN, NJ, NY, PA; | Noctuidae | NA | Insects | 5 | Not Listed | 3, 5 | US | I | Wherever found |
| Mertensia drummondii | Drummond bluebell | Bluebell, Drummond | Q2DK | P01 | AK; Canada (N.W.T,Yukon) | Boraginaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Mertensia toyabensis | [Unnamed] bluebells | Bluebells, [unnamed] | Q17T | P01 | NV; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mertensia viridis cana | Canescent bluebells | Bluebells, canescent | Q2DL | P01 | CO, UT; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mertensia viridis dilatata | Smooth-leaf bluebells | Bluebells, smooth-leaf | Q2DM | P01 | CO, UT, WY; | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Merulaxis stresemanni | Stresemann's bristlefront | Bristlefront, Stresemann's | B0BJ | V01 | Rhinocryptidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Merycomyia brunnea | Brown merycomyian tabanid fly | Tabanid fly, brown merycomyian | I0EK | I01 | FL; | Tabanidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Mesadenus polyanthus | [Unnamed] ladies'-tresses | Ladies'-tresses, [unnamed] | Q1QB | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US/Foreign | P | Wherever found |
| Mesadenus portoricensis | No common name | No common name | Q2Q3 | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Mesodon clarki nantahala | noonday snail | snail, noonday | G00V | I01 | NC; U.S.A. (NC) | Polygyridae | Aug 02, 1978 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Mesodon clausus trossulus | [Unnamed] snail | Snail, [unnamed] | G01R | I01 | AL; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Mesodon clingmanicus | Clingman covert | Covert, Clingman | G05W | I01 | NC, TN; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Meta dollof | Dolloff Cave spider | Spider, Dolloff Cave | J001 | I01 | CA; | Araneidae | NA | Arachnids | 8 | Not Listed | 8 | US | I | Wherever found |
| Metabetaeus lohena | Anchialine pool shrimp | Shrimp, anchialine pool | K037 | I01 | HI; ; During Brock’s (2004, pp. 30-57) most recent survey of Ahihi-Kinau Natural Area Reserve (NAR), located on the island of Maui, Metabetaeus lohena was observed in 9 pool groups. On the island of Hawaii, the State has been conducting surveys of Manuka NAR since 2008 and found M. lohena in 13 pools (T. Sakihara, DAR, in litt. 2010). In addition, M. lohena was found in one pool at Halape in Hawaii Volcanoes National Park (T. Jones, National Park Service, in litt. 2010). On the island of Oahu, M. lohena has been found in one pool in Waianae on State owned property, one pool at Malaekahana State Park, and, due to recent restoration efforts, this species now occurs in one pool at the Kalaeloa Unit of the Pearl Harbor National Wildlife Refuge . | Alpheidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Metabolus rugensis | Truk monarch | Monarch, Truk | B06C | V01 | Caroline Islands | Corvidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found |
| Metapogon hurdi | Hurd's metapogon robberfly | Robberfly, Hurd's metapogon | I0CN | I01 | CA; | Asilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Metrarga obscura | Mauna Loa metrargan seed bug | Seed bug, Mauna Loa metrargan | I0DG | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Metrichia volada | Page Spring micro caddisfly | Micro caddisfly, Page Spring | I0PQ | I01 | AZ; | Hydroptilidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Metromenus bardus | Heavy metromenus ground beetle | Ground beetle, heavy metromenus | I0PE | I01 | HI; | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Metromenus cuneipennis | Wedge-winged metromenus ground beetle | Ground beetle, wedge-winged metromenus | I0PF | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Metromenus oceanicus | Oceanic metromenus ground beetle | Ground beetle, oceanic metromenus | I0PG | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Metrosideros collina newellii | No common name | No common name | Q17U | P01 | HI; | Myrtaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| mexichthonius exoticus | No common name | No common name | J02U | I01 | chthoniidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Mezoneuron kavaiense | Uhi uhi | Uhi uhi | Q09U | P01 | HI; U.S.A. (HI) | Fabaceae | Jul 08, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Micranthemum micranthemoides | Nuttall's micranthemum | Micranthemum, Nuttall's | Q17V | P01 | DC, DE, MD, NJ, NY, PA, VA; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Micranthes hitchcockiana | Saddle Mountain saxifrage | Saxifrage, Saddle Mountain | Q1MO | P01 | OR; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Micranthes pensylvanica | Forbes saxifrage | Saxifrage, Forbes | Q008 | P01 | IA, IL, IN, MN, MO, WI; | Saxifragaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Micrarionta facta | Santa Barbara islandsnail | Islandsnail, Santa Barbara | G014 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta feralis | San Nicolas islandsnail | Islandsnail, San Nicolas | G004 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta gabbii | San Clemente islandsnail | Islandsnail, San Clemente | G022 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta indioensis cathedralis | Cathedral snail | Snail, cathedral | G00C | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta intercisa | Horseshoe snail | Snail, horseshoe | G03F | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta opuntia | Pricklypear islandsnail | Islandsnail, pricklypear | G015 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta rowelli bakerensis | [Unnamed] islandsnail | Islandsnail, [unnamed] | G023 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrarionta rowelli mccoiana | California McCoy snail islandsnail | Islandsnail, California McCoy snail | G005 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Micrathene whitneyi | Elf owl | Owl, elf | B0GV | V01 | Strigidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Microbembex elegans | Sand wasp | Wasp, sand | I0TH | I01 | Sphecidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Microcina edgewoodensis | Edgewood Park micro-blind harvestman | Harvestman, Edgewood Park micro-blind | J00X | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcina homi | Hom's micro-blind harvestman | Harvestman, Hom's micro-blind | J00Y | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcina jungi | Jung's micro-blind harvestman | Harvestman, Jung's micro-blind | J00Z | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Microcina leei | Lee's micro-blind harvestman | Harvestman, Lee's micro-blind | J010 | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcina lumi | Lum's micro-blind harvestman | Harvestman, Lum's micro-blind | J011 | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcina sp | Ross micro-blind harvestman | Harvestman, Ross micro-blind | J01J | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Microcina tiburona | Tiburon micro-blind harvestman | Harvestman, Tiburon micro-blind | J012 | I01 | CA; | Phalangodidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcreagris imperialis | Empire Cave pseudoscorpion | Pseudoscorpion, Empire Cave | J002 | I01 | CA; | Neobisiidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcylleopus fomicoideus | [Unnamed] riffle beetle | Riffle beetle, [unnamed] | I0PR | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcylleopus similis | [Unnamed] riffle beetle | Riffle beetle, [unnamed] | I0PS | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Microcylloepus browni | Brown's microcylloepus riffle beetle | Riffle beetle, Brown's microcylloepus | I0CD | I01 | MT; | Elmidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Microcylloepus sp | Riffle beetle | Beetle, riffle | I0SC | I01 | Gammaridae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Microdipodops megacephalus albiventer | Desert Valley kangaroo mouse | Mouse, Desert Valley kangaroo | A0BS | V01 | NV; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microdipodops megacephalus nasutus | Fletcher dark kangaroo mouse | Mouse, Fletcher dark kangaroo | A0BT | V01 | NV; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microdynerus arenicolus | Antioch potter wasp | Wasp, Antioch potter | I01Y | I01 | AZ, CA, NV; | Eumenidae | NA | Insects | 1 | Not Listed | 2, 8 | US | I | Wherever found |
| Microhexura montivaga | Spruce-fir moss spider | Spider, spruce-fir moss | J014 | I01 | NC, TN, VA; U.S.A. (TN, NC, VA) | Dipluridae | Feb 06, 1995 | Arachnids | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Microlepia strigosa var. mauiensis | No common name | No common name | S02A | P01 | HI; | Dennstaedtiaceae | Oct 31, 2016 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Micromus cookeorum | Cookes' brown lacewing | Lacewing, Cookes' brown | I07V | I01 | HI; | Hemerobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Micromus haleakalae | Haleakala micromus brown lacewing | Lacewing, Haleakala micromus brown | I07W | I01 | HI; | Hemerobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Micromus lobipennis | Lobe-wing brown lacewing | Lacewing, lobe-wing brown | I07X | I01 | HI; | Hemerobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Micromus swezeyi | Swezey's brown lacewing | Lacewing, Swezey's brown | I07Y | I01 | HI; | Hemerobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Micronaspis floridana | Florida intertidal firefly | Firefly, Florida intertidal | I071 | I01 | FL; | Lampyridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Micropterus treculii | Guadalupe bass | Bass, Guadalupe | E02D | V01 | TX; | Centrarchidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| microseris douglasii ssp. platycarpha | Small-flowered microseris | microseris, Small-flowered | Q3JP | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Microseris howellii | No common name | No common name | Q17X | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Microseris laciniata detlingii | No common name | No common name | Q17Y | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Microseris nutans siskiyouensis | No common name | No common name | Q1ZE | P01 | CA, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Microsorex hoyi thompsoni | Northeastern pygmy shrew | Shrew, northeastern pygmy | A0E5 | V01 | MA, ME, MI, NH, NY, OH, PA, VT, WI, WV; | Soricidae | NA | Mammals | 5 | Not Listed | 3, 5 | US | V | Wherever found |
| Microtus abbreviatus | St. Mathew vole | Vole, St. Mathew | A0I0 | V01 | AK; St. Mathew Island | Muridae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Microtus breweri | Beach vole | Vole, beach | A0ER | V01 | MA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Microtus californicus mohavensis | Mojave river vole | Vole, Mojave river | A0GK | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus californicus sanpabloensis | San Pablo California vole | Vole, San Pablo California | A0F3 | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus californicus scirpensis | Amargosa vole | Vole, Amargosa | A082 | V01 | CA; U.S.A. (CA) | Cricetidae | Nov 15, 1984 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Microtus californicus stephensi | Stephens' California vole | Vole, Stephens' California | A0GJ | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus californicus vallicola | Owens Valley California vole | Vole, Owens Valley California | A09V | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus chrotorrhinus carolinensis | Southern rock vole | Vole, southern rock | A0F5 | V01 | NC, TN, VA, WV; | Muridae | NA | Mammals | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Microtus longicaudus leucophaeus | Graham Mountains long-tailed vole | Vole, Graham Mountains long-tailed | A09T | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Microtus mexicanus hualpaiensis | Hualapai Mexican vole | Vole, Hualapai Mexican | A0EU | V01 | AZ; U.S.A. (AZ) | Cricetidae | Oct 01, 1987 | Mammals | 2 | Original Data in Error - Not a listable entity | 2 | US | V | Wherever found |
| Microtus mexicanus navaho | Navaho Mountain Mexican vole | Vole, Navaho Mountain Mexican | A0EY | V01 | AZ, UT; | Muridae | NA | Mammals | 2 | Not Listed | 2, 6 | US | V | Wherever found |
| Microtus montanus arizonensis | Arizona montane vole | Vole, Arizona montane | A0EQ | V01 | AZ, NM; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Microtus montanus fucosus | Pahranagat Valley montane vole | Vole, Pahranagat Valley montane | A0EZ | V01 | NV; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus montanus nevadensis | Ash Meadows montane vole | Vole, Ash Meadows montane | A09S | V01 | NV; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Microtus montanus rivularis | Virgin River montane vole | Vole, Virgin River montane | A0F6 | V01 | UT; | Muridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Microtus ochrogaster ludovicianus | Louisiana prairie vole | Vole, Louisiana prairie | A09U | V01 | LA, TX; Believed to be extinct | Muridae | NA | Mammals | 4 | Not Listed | 2, 4 | US | V | Wherever found |
| Microtus oeconomus amakensis | Amak tundra vole | Vole, Amak tundra | A0EP | V01 | AK; | Muridae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Microtus oeconomus elymocetes | Montague tundra vole | Vole, Montague tundra | A0EX | V01 | AK; | Muridae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Microtus pennsylvanicus dukecampbelli | Florida salt marsh vole | Vole, Florida salt marsh | A0ET | V01 | FL; The Florida Salt Marsh Vole is an endemic to the coastal salt marsh of the central Gulf coast of Florida. Until 2004, it was known to occur only from the type locality along the shore of Waccasassa Bay, east of Cedar Key, Levy County, Florida. In 2004, Lower Suwannee NWR staff documented the presence of the Florida Salt Marsh Vole five miles northwest of the type locality on the southern section of the refuge.; U.S.A. (FL) | Cricetidae | Jan 14, 1991 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Microtus pennsylvanicus kincaidi | Potholes meadow vole | Vole, potholes meadow | A0F1 | V01 | WA; | Muridae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Microtus pennsylvanicus provectus | Block Island meadow vole | Vole, Block Island meadow | A0ES | V01 | RI; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Microtus pennsylvanicus shattucki | Penobscot meadow vole | Vole, Penobscot meadow | A0F0 | V01 | ME; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Microtus pinetorum | Woodland vole | Vole, Woodland | A0HW | V01 | Muridae | NA | Mammals | NA | Not Listed | NA | V | Wherever found | ||
| Microtus townsendii pugeti | Shaw Island Townsend's vole | Vole, Shaw Island Townsend's | A0F4 | V01 | WA; | Muridae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Mikania stevensiana | Guaco | Guaco | Q17Z | P01 | PR, VI; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| miktoniscus | (Miktoniscus) isopod | isopod, (Miktoniscus) | K05N | I01 | trichoniscidae | NA | Crustaceans | 6 | Not Listed | NA | US | I | Wherever found | |
| Miloderes nelsoni | Nelson's miloderes weevil | Weevil, Nelson's miloderes | I0G2 | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Miloderes rulieni | Rulien's miloderes weevil | Weevil, Rulien's miloderes | I0GB | I01 | NV; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Mimizuku (=Otus) gurneyi | Giant scops owl | Owl, giant scops | B05A | V01 | Philippines: Marinduque and Mindanao Island | Strigidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Mimosa quadrivalvis var. urbaniana | Zarzarilla | Zarzarilla | Q1NB | P01 | PR, VI; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Mimulus brandegeei | Santa Cruz Island monkey-flower | Monkey-flower, Santa Cruz Island | Q180 | P01 | CA; Possibly extinct | Phrymaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus clivicola | Bank monkeyflower | Monkeyflower, bank | Q3AA | P01 | ID, OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| mimulus diffusus | Palomar monkeyflower | monkeyflower, Palomar | Q3JZ | P01 | scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Mimulus exiguus | San Bernardino Mountains monkey-flower | Monkey-flower, San Bernardino Mountains | Q181 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus filicaulis | Hetch Hetchy monkey-flower | Monkey-flower, Hetch Hetchy | Q362 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus gemmiparus | Rocky Mountain monkeyflower | Monkeyflower, Rocky Mountain | Q182 | P01 | CO; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mimulus guttatus arenicola | [Unnamed] monkeyflower | Monkeyflower, [unnamed] | Q183 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus hymenophyllus | No common name | No common name | Q363 | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Mimulus jungermannioides | No common name | No common name | Q184 | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Mimulus michiganensis | Michigan monkey-flower | monkey-flower, Michigan | Q2DN | P01 | MI; U.S.A. (MI) | Scrophulariaceae | Jun 21, 1990 | Flowering Plants | 3 | Endangered | 3 | US | P | Wherever found |
| Mimulus mohavensis | Mojave monkey-flower | Monkey-flower, Mojave | Q364 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus norrisii | Kaweah monkeyflower | Monkeyflower, Kaweah | Q365 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus patulus | Stalk-leaved monkey-flower | Monkey-flower, stalk-leaved | Q366 | P01 | ID, OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Mimulus pictus | Calico monkeyflower | Monkeyflower, calico | Q185 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus purpureus purpureus | Purple monkey-flower | Monkey-flower, purple | Q186 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus pygmaeus | Egg Lake monkey-flower | Monkey-flower, Egg Lake | Q187 | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Mimulus ringens colpophilus | Square-stemmed monkey-flower | Monkey-flower, square-stemmed | Q188 | P01 | ME; | Scrophulariaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| Mimulus rupicola | Death Valley monkeyflower | Monkeyflower, Death Valley | Q189 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus shevockii | Kelso Creek monkey-flower | Monkey-flower, Kelso Creek | Q367 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus traskiae | Santa Catalina monkey-flower | Monkey-flower, Santa Catalina | Q18A | P01 | CA; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus washingtonensis washingtonensis | Washington monkey-flower | Monkey-flower, Washington | Q368 | P01 | OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Mimulus washoensis | No common name | No common name | Q2DO | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimulus whipplei | Whipple's monkey-flower | Monkey-flower, Whipple's | Q18B | P01 | CA; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mimus graysoni | Socorro mockingbird | Mockingbird, Socorro | B0BA | V01 | Mexico | Mimidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Minuartia decumbens | The Lassics sandwort | Sandwort, The Lassics | Q2Q4 | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Minuartia godfreyi | Godfry’s stitchwort | stitchwort, Godfry's | Q18C | P01 | AL, AR, FL, GA, NC, SC, TN; | Caryophyllaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Minuartia howellii | Howell's sandwort | Sandwort, Howell's | Q03V | P01 | CA, OR; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Minuartia marcescens | No common name | No common name | Q2DP | P01 | VT; | Caryophyllaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| Minuartia rosei | Peanut sandwort | Sandwort, peanut | Q18D | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Minuartia uniflora | No common name | No common name | Q18E | P01 | AL, GA, NC, SC; | Caryophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Mirabilis macfarlanei | MacFarlane's four-o'clock | Four-o'clock, MacFarlane's | Q1ZF | P01 | ID, OR; U.S.A. (OR, ID) | Nyctaginaceae | Nov 29, 1979 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Mirabilis nyctaginea | Sandhill four-o'clock | Four-o'clock, sandhill | Q369 | P01 | TX; | Nyctaginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Mirabilis pudica | [Unnamed] four-o'clock | Four-o'clock, [unnamed] | Q18F | P01 | NV; | Nyctaginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Mirabilis rotundifolia | Roundleaf four-o'clock | Four-o'clock, roundleaf | Q2Q5 | P01 | CO; | Nyctaginaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Mitoura gryneus sweadneri | Sweadner's olive hairstreak | Hairstreak, Sweadner's olive | I0L4 | I01 | FL; | Lycaenidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Mitoura hesseli | Hessel's hairstreak butterfly | Butterfly, Hessel's hairstreak | I00E | I01 | DE, FL, GA, MA, MD, NC, NH, NJ, VA; | Lycaenidae | NA | Insects | 5 | Not Listed | 4, 5 | US | I | Wherever found |
| Mitoura thornei | Thorne's hairstreak | Hairstreak, Thorne's | I0L5 | I01 | CA; | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Mitracarpus maxwelliae | No common name | No common name | Q2DQ | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Rubiaceae | Sep 09, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Mitracarpus polycladus | No common name | No common name | Q2DR | P01 | PR; Netherlands Antilles (Saba); Puerto Rico and Netherlands Antilles (Saba); U.S.A. (PR), Saba, Anegada Island | Rubiaceae | Sep 09, 1994 | Flowering Plants | 4 | Endangered | 4 | US/Foreign | P | Wherever found |
| Mitu mitu mitu | Razor-billed curassow | Curassow, razor-billed | B04W | V01 | Brazil (Eastern) | Cracidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Mixogaster delongi | Delong's mixogaster flower fly | Flower fly, Delong's mixogaster | I073 | I01 | FL; | Syrphidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Moapa coriacea | Moapa dace | Dace, Moapa | E002 | V01 | NV; U.S.A. (NV) | Cyprinidae | Mar 11, 1967 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Moho bishopi | Bishop's `o`o | `O`o, Bishop's | B075 | V01 | HI; | Melephagidae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| Moho braccatus | Kauai `o`o (honeyeater) | `O`o, Kauai (honeyeater) | B00I | V01 | HI; U.S.A. (HI) | Meliphagidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Monachus monachus | Mediterranean monk seal | Seal, Mediterranean monk | A028 | V01 | Mediterranean, Northwest African Coast and Black Sea | Phocidae | Jun 02, 1970 | Mammals | NMFS | Endangered | NA | Foreign | V | Wherever found |
| Monachus schauinslandi | Hawaiian monk seal | Seal, Hawaiian monk | A071 | V01 | U.S.A. (HI) | Phocidae | Dec 23, 1976 | Mammals | NMFS | Endangered | NA | US | V | Wherever found |
| Monachus tropicalis | Caribbean monk seal | Seal, Caribbean monk | A00A | V01 | FL, PR, VI; No known populations in the wild;presumed extinct | Phocidae | Apr 10, 1979 | Mammals | NMFS | Extinction | 4 | US/Foreign | V | Wherever found |
| Monadenia chaceana | Siskiyou sideband | sideband, Siskiyou | G0E8 | I01 | CA, OR; | Bradybaenidae | NA | Snails | 8 | Not Listed | 1, 8 | US | I | Wherever found |
| Monadenia circumcarinata | Keeled sideband | Sideband, keeled | G02Z | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia fidelis minor | Dalles sideband | Sideband, Dalles | G030 | I01 | OR; | Helminthoglyptida | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US | I | Wherever found |
| Monadenia fidelis pronotis | Rocky coast Pacific sideband | Sideband, Rocky coast Pacific | G008 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia hillebrandi yosemitensis | Yosemite mariposa sideband | Sideband, Yosemite mariposa | G009 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia mormonum buttoni | Button's Sierra sideband | Sideband, Button's Sierra | G031 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia mormonum hirsuta | Hirsute sierra sideband | Sideband, hirsute sierra | G032 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia setosa | Trinity bristlesnail | Bristlesnail, Trinity | G002 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Monadenia troglodytes ssp. wintu | Wintu sideband | sideband, Wintu | G0E9 | I01 | CA; | Bradybaenidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Monadenia troglodytes troglodytes | Shasta sideband | sideband, Shasta | G033 | I01 | CA; | Helminthoglyptida | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Monarcha takatsukasae | Tinian Monarch (old world flycatcher) | Monarch, Tinian (old world flycatcher) | B00V | V01 | MP; | Corvidae | Jun 02, 1970 | Birds | 1 | Recovery | 1 | US | V | Wherever found |
| Monarda fistulosa brevis | [Unnamed] horse-mint | Horse-mint, [unnamed] | Q36B | P01 | WV; | Lamiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Monarda stipitatoglandulosa | [Unnamed] horse-mint | Horse-mint, [unnamed] | Q2DS | P01 | AR, OK; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Monardella antonina | San Antonio Hills monardella | Monardella, San Antonio Hills | Q2DT | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella antonina ssp. benitensis | San Benito monardella | Monardella, San Benito | Q18G | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella crispa | Crisp monardella | Monardella, crisp | Q18H | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella diaboli | No common name | No common name | Q2DU | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella douglasii venosa | Veiny monardella | Monardella, veiny | Q2DV | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella frutescens | San Luis Obispo monardella | Monardella, San Luis Obispo | Q18I | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella hypoleuca lanata | Felt leaf rock-mint | Rock-mint, felt leaf | Q18J | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella leucocephala | Merced monardella | Monardella, Merced | Q18K | P01 | CA; Possibly extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella linoides oblonga | Flax-like monardella | Monardella, flax-like | Q18L | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella macrantha hallii | Hall's monardella | Monardella, Hall's | Q18N | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella nana leptosiphon | San Felipe monardella | Monardella, San Felipe | Q2DW | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella palmeri | Palmer's monardella | Monardella, Palmer's | Q2DX | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella pringlei | Pringle monardella | Monardella, Pringle | Q18O | P01 | CA; Possibly extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella purpurea | Siskiyou monardella | Monardella, Siskiyou | Q2DY | P01 | CA, OR; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Monardella robisonii | Robison's monardella | Monardella, Robison's | Q18P | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella scelerata | Stone Corral Canyon monardella | Monardella, Stone Corral Canyon | Q2DZ | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monardella stebbinsii | Feather River monardella | Monardella, Feather River | Q2E0 | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| monardella villosa ssp. globosa | Robust monardella | monardella, Robust | Q3KH | P01 | lamiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Monardella viminea | Willowy monardella | Monardella, willowy | Q18M | P01 | CA; U.S.A. (CA), Mexico | Lamiaceae | Oct 13, 1998 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Monardella viridis saxicola | Rock monardella | Monardella, rock | Q2E1 | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Monolopia (=Lembertia) congdonii | San Joaquin wooly-threads | Wooly-threads, San Joaquin | Q34W | P01 | CA; U.S.A. (CA) | Asteraceae | Jul 19, 1990 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Monophylus plethodon frater | Insular long-tongued bat | Bat, insular long-tongued | A0AC | V01 | PR, VI; Believed to be extinct | Phyllostomidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Monotropa uniflora | Indian pipe | Pipe, Indian | Q18Q | P01 | FL; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Monotropsis odorata | Pygmypipes | Pygmypipes | Q3EP | P01 | NC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Monotropsis odorata | Sweet pinesap | Pinesap, sweet | Q18R | P01 | FL; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Montastraea franksi | Star coral | coral, Star | P005 | I01 | Faviidae | NA | Corals | NMFS | Not Listed | NA | US/Foreign | I | Wherever found | |
| Montia bostockii | No common name | No common name | Q2E2 | P01 | AK; Canada (Yukon) | Portulacaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Montia howellii | Howell's montia | Montia, Howell's | Q36C | P01 | CA, WA; Canada (B.C.) | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US/Foreign | P | Wherever found |
| Montipora australiensis | No common name | No common name | P017 | I01 | Acroporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Morenia ocellata | Burmese peacock turtle | Turtle, Burmese peacock | C01E | V01 | Burma (Myanmar) | Emydidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Morinda trimera | Noni kuahiwi | Noni kuahiwi | Q18S | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Moschus spp. (all species) | Musk deer | Deer, musk | A056 | V01 | Central and East Afghanistan,Asia,Bhutan,Myanmar,China (Tibet,Yunnan),India,Nepa l,Pakistan,India (Sikkim); Central and East Afghanistan,Asia,Bhutan,Myanmar,China (Tibet,Yunnan),India,Nepal,Pakistan,India (Sikkim) | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Afghanistan, Bhutan, Burma, China (Tibet, Yunnan), India, Nepal, Pakistan, Sikkim |
| moxostoma congestum | Gray redhorse | redhorse, Gray | E0BB | V01 | Catostomidae | NA | Fishes | 2 | Not Listed | NA | US | V | Wherever found | |
| Moxostoma lacerum | Harelip sucker | Sucker, harelip | E09S | V01 | AL, GA, IN, KY, OH, TN, VA; Believed to be extinct | Catostomidae | NA | Fishes | 4 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Moxostoma robustum | Robust redhorse | Redhorse, robust | E06O | V01 | GA, NC, SC; | Catostomidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Moxostoma sp. | Sicklefin redhorse | Redhorse, Sicklefin | E0AF | V01 | GA, NC; | Catostomidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Moxostoma valenciennesi | Greater redhorse | Redhorse, greater | E09D | V01 | IL, IN, KY, MI, MN, ND, NY, OH, WI; Canada (Que.) | Catostomidae | NA | Fishes | 6 | Not Listed | 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Mucuna sloanei var. persericea | sea bean | bean, sea | Q3NZ | P01 | HI; | Fabaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Muhlenbergia californica | California muhly | muhly, California | Q3L4 | P01 | Poaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Muhlenbergia curtisetosa | [Unnamed] muhly | Muhly, [unnamed] | Q2E3 | P01 | IL, MO, OH, PA; | Poaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Muhlenbergia pilosa | No common name | No common name | Q2UU | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Muhlenbergia torreyana | Torrey's muhly | Muhly, Torrey's | Q18T | P01 | DE, GA, MD, NC, NJ, NY, TN; | Poaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Muhlenbergia villiflora var. villosa | Villous muhly | Muhly, villous | Q18U | P01 | NM, TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Muilla clevelandii | San Diego goldenstar | Goldenstar, San Diego | Q18V | P01 | CA; Mexico (Baja California) | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Muilla coronata | Crowned muilla | Muilla, crowned | Q18W | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Muntiacus feae | Fea's muntjac | Muntjac, Fea's | A07Q | V01 | Northern Thailand,Myanmar; Wherever found | Cervidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Musineon lineare | No common name | No common name | Q18X | P01 | ID, UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 1, 6 | US | P | Wherever found |
| Mustela frenata peninsulae | Florida long-tailed weasel | Weasel, Florida long-tailed | A0F8 | V01 | FL; | Mustelidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Mustela nigripes | Black-footed ferret | Ferret, black-footed | A004 | V01 | AZ, CO, KS, MT, NM, SD; Chihuahua,Mexico. Potentially extirpated in other States of range and Canada; Chihuahua,Mexico. Presumed to be extirpated in other States of range and Canada; Western U.S.A.,Western Canada | Mustelidae | Mar 11, 1967 | Mammals | 6 | Endangered | 2, 6 | US/Foreign | V | Wherever found, except where listed as an experimental population |
| Mustela nigripes | Black-footed ferret | Ferret, black-footed | A004 | V02 | AZ, CO, MT, SD, UT, WY; Chihuahua, Mexico; Chihuahua, Mexico; Shirley Basin in Wyoming; Uinta Basin in Utah; Western U.S.A.,Western Canada | Mustelidae | Aug 21, 1991 | Mammals | 6 | Experimental Population, Non-Essential | 2, 6 | US/Foreign | V | U.S.A. (WY and specified portions of AZ, CO, MT, SD, and UT, see 17.84(g)(9)) |
| Mustela vison evergladensis | Everglades mink | Mink, Everglades | A08W | V01 | FL; | Mustelidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Mustela vison lutensis | Florida mink | Mink, Florida | A0BE | V01 | FL; | Mustelidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Myadestes lanaiensis rutha | Molokai thrush | Thrush, Molokai | B04E | V01 | HI; | Muscicapidae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Myadestes myadestinus | Large Kauai (=kamao) Thrush | Thrush, large Kauai (=kamao) | B04D | V01 | HI; | Muscicapidae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Myadestes palmeri | Small Kauai (=puaiohi) Thrush | Thrush, small Kauai (=puaiohi) | B00S | V01 | HI; | Muscicapidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Mycetophyllia ferox | Rough Cactus Coral | Coral, Rough Cactus | P006 | I01 | Mussidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | US/Foreign | I | Wherever found | |
| Mycoporum biseptatum | Charred volcanoes | volcanoes, Charred | U012 | P01 | Mycoporaceae | NA | Lichens | 4 | Not Listed | NA | US | P | ||
| Mycotrupes pedester | Scrub Island burrowing scarab | Scarab, Scrub Island burrowing | I0D4 | I01 | FL; | Geotrupidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Mycteria americana | Wood stork | Stork, wood | B06O | V01 | AL, FL, GA, MS, NC, SC; The non-breeding season range includes peninsular Florida; the coastal plain and large river systems of the panhandle of Florida, Alabama, Georgia, South Carolina; and southern North Carolina and eastern Mississippi. Most wood storks observed in eastern Mississippi are likely from the Southeast U.S. breeding population.; (U.S.A.) AL, FL, GA, MS, NC, SC | Ciconiidae | Feb 28, 1984 | Birds | 4 | Threatened | 4 | US | V | U.S.A. (AL, FL, GA, MS, NC, SC) |
| Myiagra freycineti | Guam broadbill | Broadbill, Guam | B05W | V01 | GU; Possibly extinct | Muscicapidae | Aug 27, 1984 | Birds | 1 | Extinction | 1 | US | V | Wherever found |
| myiarchus tyrannulus | Brown-crested flycatcher | flycatcher, Brown-crested | B0EI | V01 | tyrannidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Myoporum sandwicense stellatum | Naio | Naio | Q2UV | P01 | HI; | Myoporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Myosurus minimus | tiny mousetail | mousetail, tiny | Q3L5 | P01 | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Myosurus minimus apus | Little mousetail | Mousetail, little | Q2E4 | P01 | CA, OR; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Myotis austroriparius | Southeastern myotis | Myotis, southeastern | A0CF | V01 | AL, AR, FL, GA, IL, IN, KY, LA, MO, MS, NC, OK, SC, TN, TX; | Vespertilionidae | NA | Mammals | 4 | Not Listed | 2, 3, 4 | US | V | Wherever found |
| myotis californicus | California myotis | myotis, California | A0IO | V01 | vespertilionidae | NA | Mammals | 8 | Not Listed | NA | US | V | Wherever found | |
| Myotis evotis | Long-eared myotis | Myotis, long-eared | A0H6 | V01 | CO, WA; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 1, 6 | US/Foreign | V | Wherever found |
| Myotis grisescens | Gray bat | Bat, gray | A04J | V01 | AL, AR, FL, GA, IL, IN, KS, KY, MO, MS, NC, OK, TN, VA, WV; Entire | Vespertilionidae | Apr 28, 1976 | Mammals | 3 | Endangered | 2, 3, 4, 5, 6 | US | V | Wherever found |
| Myotis hajastanicus | Armenian Whiskered Bat | Bat, Armenian Whiskered | A0JJ | V01 | Vespertilionidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| myotis keenii | Keen's myotis | myotis, Keen's | A0IQ | V01 | vespertilionidae | NA | Mammals | 7 | Not Listed | NA | US | V | Wherever found | |
| Myotis leibii | Small-footed myotis | Myotis, small-footed | A0H5 | V01 | GA; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 4 | US/Foreign | V | Wherever found |
| Myotis leibii | Eastern small-footed bat | Bat, Eastern small-footed | A0AB | V01 | GA; | Vespertilionidae | NA | Mammals | 4 | Not Listed | 4 | US/Foreign | V | Wherever found |
| Myotis lucifugus | Little brown bat | Bat, little brown | A0JF | V01 | CO, GA, MS, NC, OH, SC; | Vespertilionidae | NA | Mammals | 5 | Not Listed | 3, 4, 6 | US/Foreign | V | Wherever found |
| Myotis lucifugus occultus | Occult little brown bat | Bat, occult little brown | A0AF | V01 | AZ, CA, NM, TX; | Vespertilionidae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Myotis septentrionalis | Northern Long-Eared Bat | Bat, Northern long-eared | A0JE | V01 | AL, AR, CT, DC, DE, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TN, VA, VT, WI, WV, WY; | Vespertilionidae | May 04, 2015 | Mammals | 3 | Threatened | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Myotis sodalis | Indiana bat | Bat, Indiana | A000 | V01 | AL, AR, CT, GA, IA, IL, IN, KY, MD, MI, MO, MS, NC, NJ, NY, OH, OK, PA, TN, VA, VT, WV; ; Entire | Vespertilionidae | Mar 11, 1967 | Mammals | 3 | Endangered | 2, 3, 4, 5 | US | V | Wherever found |
| Myotis thysanodes | Fringed myotis | Myotis, fringed | A0H7 | V01 | CO; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Myotis thysanodes pahasapensis | Fringed-tailed myotis | Myotis, fringed-tailed | A0GF | V01 | CO, NE, SD, WY; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Myotis velifer | Cave myotis | Myotis, cave | A0H8 | V01 | AZ, CA, NE, NM, NV, TX; | Vespertilionidae | NA | Mammals | 2 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Myotis volans | Long-legged myotis | Myotis, long-legged | A0H9 | V01 | CO; | Vespertilionidae | NA | Mammals | 6 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Myotis yumanensis | Yuma myotis | Myotis, Yuma | A0HA | V01 | CO; | Vespertilionidae | NA | Mammals | 1 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Myrcia paganii | No common name | No common name | Q2Q6 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Myrtaceae | Feb 18, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Myrcianthes fragrans simpsonii | Simpson stopper | Stopper, Simpson | Q18Y | P01 | FL; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Myrica hartwegii | Sierra sweet-bay | Sweet-bay, Sierra | Q18Z | P01 | CA; | Myricaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Myriophyllum laxum | No common name | No common name | Q190 | P01 | AL, FL, GA, NC, SC; | Haloragaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Myrmecobius fasciatus | Numbat | Numbat | A044 | V01 | Wherever found | Myrmecobidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Myrmosula pacifica | Antioch mutillid wasp | Wasp, Antioch mutillid | I01W | I01 | CA; | Mutillidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Myrsine fernseei | Kolea | Kolea | Q191 | P01 | HI; | Myrsinaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Myrsine fosbergii | Kolea | Kolea | Q3HS | P01 | HI; | Myrsinaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Myrsine juddii | Kolea | Kolea | Q36D | P01 | HI; U.S.A. (HI) | Primulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Myrsine knudsenii | Kolea | Kolea | Q3N0 | P01 | HI; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Myrsine lanaiensis | Kolea | Kolea | Q192 | P01 | HI; | Myrsinaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Myrsine linearifolia | Kolea | Kolea | Q193 | P01 | HI; U.S.A. (HI) | Primulaceae | Oct 10, 1996 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Myrsine mezii | Kolea | Kolea | Q2E5 | P01 | HI; Believed to be extinct; U.S.A. (HI) | Primulaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Myrsine petiolata | Kolea | Kolea | Q195 | P01 | HI; | Myrsinaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Myrsine vaccinioides | Kolea | Kolea | Q36E | P01 | HI; | Primulaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Myrsine wawraea | Kolea | Kolea | Q196 | P01 | HI; | Myrsinaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Mystacina robusta | New Zealand Greater Short-Tailed Bat | Bat, New Zealand Greater Short-Tailed | A0JW | V01 | Mystacinidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Myzomela cardinalis saffordi | Cardinal honey-eater | Honey-eater, cardinal | B060 | V01 | FL, GA; | Melephagidae | NA | Birds | 1 | Not Listed | 4 | US | V | Wherever found |
| Naemorhedus (=Capricornis) sumatraensis | Serow | Serow | A064 | V01 | East Asia,Sumatra | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Naemorhedus goral | Goral | Goral | A05C | V01 | Wherever found | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Naesiotus christenseni | Santa Rita rabdotus | rabdotus, Santa Rita | G0DN | I01 | Bulimulidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Najas filifolia | Needleleaf waternymph | waternymph, Needleleaf | Q36F | P01 | FL, GA; | Najadaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Najas flexilis | Fish Lake naiad | Naiad, Fish Lake | Q197 | P01 | UT; Possibly extinct | Najadaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Nama retrorsum | No common name | No common name | Q198 | P01 | AZ, UT; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| nama stenocarpum | Nama nama | nama, Nama | Q3K0 | P01 | hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Nama xylopodum | No common name | No common name | Q199 | P01 | NM, TX; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Napaea dioica | No common name | No common name | Q2UW | P01 | IA, IL, IN, MN, OH, WI; | Malvaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Narthecium americanum | Bog Asphodel | Asphodel, bog | Q2E6 | P01 | NJ, SC; | Liliaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Nasalis concolor | Pagi Island langur | Langur, Pagi Island | A01I | V01 | Indonesia | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Nasalis larvatus | Proboscis monkey | Monkey, proboscis | A05U | V01 | Borneo | Cercopithecidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Nassella cernua | Nodding needlegrass | Needlegrass, nodding | Q3J3 | P01 | Poaceae | NA | Flowering Plants | 8 | Not Listed | NA | US/Foreign | P | Wherever found | |
| Natalus jamaicensis | Jamaican Greater Funnel-Eared Bat | Bat, Jamaican Greater Funnel-Eared | A0JQ | V01 | Phyllostomidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Natalus primus | Cuban Greater Funnel-Eared Bat | Bat, Cuban Greater Funnel-Eared | A0JY | V01 | Natalidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Navarretia fossalis | Spreading navarretia | Navarretia, spreading | Q2E7 | P01 | CA; Mexico (Baja California); U.S.A. (CA), Mexico (Baja California) | Polemoniaceae | Oct 13, 1998 | Flowering Plants | 8 | Threatened | 8 | US/Foreign | P | Wherever found |
| Navarretia heterandra | Tehama pincushionplant | pincushionplant, Tehama | Q3J7 | P01 | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | Few-flowered navarretia | Navarretia, few-flowered | Q19A | P01 | CA; U.S.A. (CA) | Polemoniaceae | Jun 18, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Navarretia leucocephala ssp. plieantha | Many-flowered navarretia | Navarretia, many-flowered | Q19B | P01 | CA; U.S.A. (CA) | Polemoniaceae | Jun 18, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Navarretia myersii ssp. deminuta | Myers' pincushionplant | pincushionplant, Myers' | Q3N4 | P01 | polemoniaceae | NA | Flowering Plants | 8 | Not Listed | NA | US | P | Wherever found | |
| navarretia nigelliformis ssp. nigelliformis | Adobe navarretia | navarretia, Adobe | Q3K7 | P01 | polemoniaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Navarretia prolifera lutea | Yellow-bur navarretia | Navarretia, yellow-bur | Q19C | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Navarretia prostrata | prostrate pincushionplant | pincushionplant, prostrate | Q3L2 | P01 | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Navarretia setiloba | Piute Mountains navarretia | Navarretia, Piute Mountains | Q19D | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Nebria darlingtoni | South Forks ground beetle | Ground beetle, South Forks | I0NG | I01 | CA; | Carabidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Nebria gebleri siskiyouensis | Siskiyou ground beetle | Ground beetle, Siskiyou | I0NH | I01 | CA; | Carabidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| nebria gebleri ssp. cascadensis | (Nebria gebleri cascadensis) ground beetle | ground beetle, (Nebria gebleri cascadensis) | I0U6 | I01 | carabidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| nebria kincaidi ssp. balli | (Nebria kincaidi balli) ground beetle | ground beetle, (Nebria kincaidi balli) | I0U2 | I01 | carabidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| nebria paradisi | (Nebria paradisi) ground beetle | ground beetle, (Nebria paradisi) | I0U3 | I01 | carabidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Nebria sahlbergii triad | Trinity Alps ground beetle | Ground beetle, Trinity Alps | I0NI | I01 | CA; | Carabidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Nectarinia prigoginei | Marungu sunbird | Sunbird, Marungu | B0A4 | V01 | Nectariniidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Nectophrynoides spp. | African viviparous toads | Toads, African viviparous | D00B | V01 | Tanzania, Liberia, Ivory Coast, Guinea, Ethiopia, Cameroon | Bufonidae | Jun 14, 1976 | Amphibians | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Necturus alabamensis | Black warrior (=Sipsey Fork) Waterdog | Waterdog, black warrior (=Sipsey Fork) | D030 | V01 | AL; | Proteidae | Feb 02, 2018 | Amphibians | 4 | Endangered | 4 | US | V | Wherever found |
| Necturus lewisi | Neuse River waterdog | Waterdog, Neuse River | D00O | V01 | NC; Neuse and Tar-Pamlico River Basins in eastern North Carolina | Proteidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Necydalis rudei | Rude's long-horned beetle | Long-horned beetle, Rude's | I08A | I01 | CA; | Cerambycidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Neduba extincta | Antioch Dunes shieldback katydid | Katydid, Antioch Dunes shieldback | I07O | I01 | CA; Believed to be extinct | Tettigoniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Neduba longipennis | Santa Monica shieldback katydid | Katydid, Santa Monica shieldback | I07T | I01 | CA; | Tettigoniidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Nemacladus twisselmannii | Twisselmann's nemacladus | Nemacladus, Twisselmann's | Q19E | P01 | CA; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Nemastylis floridana | Fall-flowering ixia | Ixia, fall-flowering | Q19F | P01 | FL; | Iridaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Nemopalpus nearcticus | Sugarfoot moth fly | Moth fly, sugarfoot | I0AJ | I01 | FL; | Psychodidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Nemosia rourei | Cherry-throated tanager | Tanager, cherry-throated | B0DD | V01 | Brazil | Emberizidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| neoallochernes incertus | No common name | No common name | J02V | I01 | chernetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Neofelis nebulosa | Clouded leopard | Leopard, clouded | A04L | V01 | Southeast and south-central Asia,Taiwan; Wherever found | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Neofiber alleni | Round-tailed muskrat | Muskrat, round-tailed | A0CE | V01 | FL; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| neoleptoneta anopica | No common name | No common name | J02W | I01 | leptonetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| neoleptoneta concinna | No common name | No common name | J02X | I01 | leptonetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| neoleptoneta devia | No common name | No common name | J02Y | I01 | leptonetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Neoleptoneta microps | Government Canyon Bat Cave Spider | Spider, Government Canyon Bat Cave | J018 | I01 | TX; U.S.A. (TX) | Leptonetidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| Neoleptoneta myopica | Tooth Cave Spider | Spider, Tooth Cave | J00B | I01 | TX; U.S.A. (TX) | Leptonetidae | Sep 16, 1988 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| neoleptoneta valverde | No common name | No common name | J02Z | I01 | leptonetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Neomachiloides heteropus | Hawaiian long-palp bristletail | Bristletail, Hawaiian long-palp | I02S | I01 | HI; | Machilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Neomorphus geoffroyi dulcis | Southeastern rufous-vented ground cuckoo | Cuckoo, southeastern rufous-vented ground | B0CW | V01 | Brazil | Cuculidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Neonemobius eurynotus | Berkeley Ground cricket | Cricket, Berkeley Ground | I0SY | I01 | Gryllidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Neonympha mitchellii francisci | Saint Francis' satyr butterfly | Butterfly, Saint Francis' satyr | I0MZ | I01 | NC; ; U.S.A. (NC) | Nymphalidae | Apr 18, 1994 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Neonympha mitchellii mitchellii | Mitchell's satyr Butterfly | Butterfly, Mitchell's satyr | I00K | I01 | AL, IN, MI, MS, OH, VA; U.S.A. (OH, NJ, MI, IN) | Nymphalidae | Jun 25, 1991 | Insects | 3 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Neoparrya lithophila | No common name | No common name | Q19H | P01 | CO; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Neophema chrysogaster | Orange-bellied parakeet | Parakeet, orange-bellied | B02C | V01 | Australia | Psittacidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Neophema pulchella | Turquoise parakeet | Parakeet, turquoise | B02F | V01 | Australia | Psittacidae | Jun 02, 1970 | Birds | Foreign | Recovery | NA | Foreign | V | Wherever found |
| Neophema splendida | Scarlet-chested parakeet | Parakeet, scarlet-chested | B02E | V01 | Australia | Psittacidae | Dec 02, 1970 | Birds | Foreign | Recovery | NA | Foreign | V | Wherever found |
| Neoplanorbis carinatus | [Unnamed] snail | Snail, [unnamed] | G07B | I01 | AL; | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Neoplanorbis smithi | [Unnamed] snail | Snail, [unnamed] | G07C | I01 | AL; | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Neoplanorbis tantillus | [Unnamed] snail | Snail, [unnamed] | G07D | I01 | AL; | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Neoplanorbis umbilicatus | [Unnamed] snail | Snail, [unnamed] | G07E | I01 | AL; | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Neoseps reynoldsi | Sand skink | Skink, sand | C03V | V01 | FL; U.S.A. (FL) | Scincidae | Nov 06, 1987 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Neostapfia colusana | Colusa grass | Grass, Colusa | Q19I | P01 | CA; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Neothremma andersoni | Columbia Gorge neothremman caddisfly | Caddisfly, Columbia Gorge neothremman | I03L | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Neothremma genella | Golden-horned caddisfly | Caddisfly, golden-horned | I0IX | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Neothremma siskiyou | Siskiyou caddisfly | Caddisfly, Siskiyou | I0J1 | I01 | CA; | Limnephilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Neotoma floridana haematoreia | Southern Appalachian eastern woodrat | Woodrat, Southern Appalachian eastern | A0FE | V01 | GA, NC, SC; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Neotoma floridana smalli | Key Largo woodrat | Woodrat, Key Largo | A087 | V01 | FL; U.S.A. (FL) | Cricetidae | Sep 21, 1983 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Neotoma fuscipes annectens | San Francisco dusky-footed woodrat | Woodrat, San Francisco dusky-footed | A0GM | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Neotoma fuscipes luciana | Monterey dusky-footed woodrat | Woodrat, Monterey dusky-footed | A0GL | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Neotoma fuscipes riparia | Riparian woodrat (=San Joaquin Valley) | Woodrat, riparian (=San Joaquin Valley) | A0FC | V01 | CA; U.S.A. (CA) | Muridae | Feb 23, 2000 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Neotoma lepida intermedia | San Diego desert woodrat | Woodrat, San Diego desert | A0GN | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Neotoma magister | Alleghany woodrat | Woodrat, Alleghany | A0FB | V01 | VA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Neotoma mexicana bullata | Santa Catalina Mountains woodrat | Woodrat, Santa Catalina Mountains | A0FD | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Neotoma micropus leucophaea | White Sands woodrat | Woodrat, White Sands | A0FF | V01 | NM; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Neotragus moschatus moschatus | Zanzibar suni | Suni, Zanzibar | A07S | V01 | Tanzania (Zanzibar and adjacent islands) | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Neotrichia downsi | No common name | No common name | I0VA | I01 | Hydroptilidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Neotrichia kitae | Kite's neotrichian micro caddisfly | Micro caddisfly, Kite's neotrichian | I0A2 | I01 | MO; | Hydroptilidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Neraudia angulata | No common name | No common name | Q1ZH | P01 | HI; U.S.A. (HI) | Urticaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Neraudia kauaiensis | No common name | No common name | Q19J | P01 | HI; | Urticaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Neraudia melastomifolia | Ma`oloa | Ma`oloa | Q19K | P01 | HI; | Urticaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Neraudia ovata | No common name | No common name | Q19L | P01 | HI; U.S.A. (HI) | Urticaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Neraudia sericea | No common name | No common name | Q1ZI | P01 | HI; U.S.A. (HI) | Urticaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Neritilia hawaiiensis | Anchialine Pool Snail | Snail, Anchialine Pool | G04L | I01 | HI; | Neritidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Nerodia clarkii | Gulf salt marsh snake | Snake, Gulf salt marsh | C05G | V01 | FL; | Colubridae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Nerodia clarkii taeniata | Atlantic salt marsh snake | Snake, Atlantic salt marsh | C01T | V01 | FL; The Atlantic Salt Marsh Snake Recovery Plan (1993) and the South Florida Multi Species Recovery Plan (1999) indicate the Atlantic Salt Marsh Snake’s range may be more restricted than thought at the time of listing (1977). The zone of intergradation appears to coincide with the increasing dominance of mangroves swamps in Brevard County. Thus, the brackish, coastal marshes of Volusia County, from the Halifax River south to the northern portions of the Indian River are where the ASMS likely occurs (Service 1993 and 1999). ; U.S.A. (FL) | Colubridae | Dec 29, 1977 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Nerodia erythrogaster neglecta | Copperbelly water snake | Snake, copperbelly water | C03X | V01 | IN, MI, OH; U.S.A. (OH, MI, KY, IL, IN) | Colubridae | Jan 29, 1997 | Reptiles | 3 | Threatened | 3 | US | V | Indiana north of 40 degrees north latitude, Michigan, Ohio |
| Nerodia harteri harteri | Brazos water snake | Snake, Brazos water | C03W | V01 | TX; | Colubridae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Nerodia paucimaculata | Concho water snake | Snake, Concho water | C04E | V01 | TX; | Colubridae | Sep 03, 1986 | Reptiles | 2 | Recovery | 2 | US | V | Wherever found |
| Nerodia sipedon | Northern water snake | snake, Northern water | C071 | V01 | Colubridae | NA | Reptiles | 5 | Not Listed | NA | US | V | Upper Tidal Potomac River population | |
| Nerodia sipedon insularum | Lake Erie water snake | Snake, Lake Erie water | C04P | V01 | OH; | Colubridae | Aug 30, 1999 | Reptiles | 3 | Recovery | 3 | US/Foreign | V | Lake Erie offshore islands and their adjacent waters (located more than 1 mile from mainland)_U.S.A. (OH), Canada (Ont.) |
| Nervilia jacksoniae | No common name | No common name | Q3P2 | P01 | GU, MP; | Orchidaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Neseis alternata | Kauai band-legged seed bug | Seed bug, Kauai band-legged | I0DF | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Neseis haleakalae | Mt. Haleakala seed bug | Seed bug, Mt. Haleakala | I0DH | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesidiolestes ana | Ana wingless thread bug | Thread bug, ana wingless | I0EN | I01 | HI; | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesidiolestes insularis | Mt. Tantalus wingless thread bug | Thread bug, Mt. Tantalus wingless | I0EO | I01 | HI; | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesidiolestes roberti | Robert's wingless thread bug | Thread bug, Robert's wingless | I0EQ | I01 | HI; | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesidiolestes selium | Selium wingless thread bug | Thread bug, Selium wingless | I0ER | I01 | HI; | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesillas aldabranus | Aldabra Warbler (old world warbler) | Warbler, Aldabra (old world warbler) | B0AA | V01 | Indian Ocean-Seychelles (Aldabra Island); Seychelles (Aldabra Island) | Muscicapidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Nesocryptias villosa | Villosan flightless seed bug | Seed bug, Villosan flightless | I0DN | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesogenes rotensis | No common name | No common name | Q3GY | P01 | MP; Western Pacific Ocean-U.S.A. (Commonwealth of the Northern Mariana Islands) | Verbenaceae | Apr 08, 2004 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Nesomimesa kauaiensis | Kauai nesomimesan sphecid wasp | Wasp, Kauai nesomimesan sphecid | I0F3 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesomimesa perkinsi | Perkins' nesomimesan sphecid wasp | Wasp, Perkins' nesomimesan sphecid | I0M9 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesomimesa sciopteryx | Shade-winged nesomimesan sphecid wasp | Wasp, shade-winged nesomimesan sphecid | I0F7 | I01 | HI; | Sphecidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis homeochroma | Monocolor yellow-faced bee | Yellow-faced bee, monocolor | I0HX | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis mauiensis | Maui yellow-faced bee | Yellow-faced bee, Maui | I0HY | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis melanothrix | Melanothrix yellow-faced bee | Yellow-faced bee, melanothrix | I0HZ | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis mutata | Mutatan yellow-faced bee | Yellow-faced bee, mutatan | I0I0 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis neglecta | Molokai yellow-faced bee | Yellow-faced bee, Molokai | I0I1 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis nivalis | Snowy yellow-faced bee | Yellow-faced bee, snowy | I0I2 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis pele | Pele yellow-faced bee | Yellow-faced bee, pele | I0I3 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis rugulosa | Rugulose yellow-faced bee | Yellow-faced bee, rugulose | I0I4 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesoprosopis setosifrons | Bristlefront yellow-faced bee | Yellow-faced bee, bristlefront | I0I5 | I01 | HI; Believed to be extinct | Hylaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesorestias filicicola | Mt. Tantalus short-wing fern planthopper | Planthopper, Mt. Tantalus short-wing fern | I0BM | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne acuta | Iao Valley nesosydne planthopper | Planthopper, Iao Valley nesosydne | I0BN | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne bridwelli | Bridewell's nesosydne planthopper | Planthopper, Bridewell's nesosydne | I0BO | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne cyrtandrae | Nahiku nesosydne planthopper | Planthopper, Nahiku nesosydne | I0BP | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne cyrtandricola | Glenwood nesosydne planthopper | Planthopper, Glenwood nesosydne | I0BQ | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne kuschei | Kusche's nesosydne planthopper | Planthopper, Kusche's nesosydne | I0BR | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne leahi | Diamond Head nesosydne planthopper | Planthopper, Diamond Head nesosydne | I0BS | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne longipes | Long-footed nesosydne planthopper | Planthopper, long-footed nesosydne | I0BT | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesosydne sulcata | Keanae nesosydne planthopper | Planthopper, Keanae nesosydne | I0BU | I01 | HI; | Delphacidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesotocus giffordi | Gifford's nesotocus weevil | Weevil, Gifford's nesotocus | I0FN | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesotocus kauaiensis | Kauai nesotocus weevil | Weevil, Kauai nesotocus | I0FO | I01 | HI; Possibly extinct,not reported since 1965 | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesotocus munroi | Munro's nesotocus weevil | Weevil, Munro's nesotocus | I0FY | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nesticus cooperi | Lost Nantahala Cave spider | Spider, Lost Nantahala Cave | J00V | I01 | NC; | Nesticidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Nesticus dilutus | Grassy Creek Cave spider | Spider, Grassy Creek Cave | J00U | I01 | TN; | Nesticidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Nesticus furtivus | Crystal Caverns cave spider | Spider, Crystal Caverns cave | J00T | I01 | TN; | Nesticidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Nesticus jonesi | Cave Spring Cave spider | Spider, Cave Spring Cave | J00R | I01 | AL; | Nesticidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Nesticus valentinei | Valentine's cave spider | Spider, Valentine's cave | J00W | I01 | TN; | Nesticidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Nestronia umbellula | No common name | No common name | Q19M | P01 | AL, GA, MS, NC, SC, TN, VA; | Santalaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Neurocordulia clara | Apalachicola twilight skimmer | Skimmer, Apalachicola twilight | I0DQ | I01 | AL, FL; | Corduliidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Neviusia alabamensis | No common name | No common name | Q19N | P01 | AL, AR, GA, MO, MS, TN; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Newcombia canaliculata | Newcomb's tree snail | Tree snail, Newcomb's | G09T | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Newcombia cumingi | Newcomb's Tree snail | Tree snail, Newcomb's | G09U | I01 | HI; | Achatinellidae | Jun 27, 2013 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Newcombia perkinsi | Newcomb's tree snail | Tree snail, Newcomb's | G09V | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Newcombia pfeifferi | Newcomb's tree snail | Tree snail, Newcomb's | G09W | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Newcombia sulcata | Newcomb's tree snail | Tree snail, Newcomb's | G09Y | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Nicrophorus americanus | American burying beetle | Beetle, American burying | I028 | I01 | AR, KS, MA, MI, NE, OH, OK, RI, SD, TX; Canada (Ont.); U.S.A. (eastern States south to FL, west to SD and TX), eastern Canada | Silphidae | Jul 13, 1989 | Insects | 2 | Endangered | 2, 3, 4, 5, 6 | US/Foreign | I | Wherever found, except where listed as an experimental population |
| Nicrophorus americanus | American burying beetle | Beetle, American burying | I028 | I02 | U.S.A. (eastern States south to FL, west to SD and TX), eastern Canada | Silphidae | Jul 22, 2011 | Insects | 3 | Experimental Population, Non-Essential | NA | US | I | In southwestern Missouri, the counties of Cedar, St. Clair, Bates, and Vernon. |
| Nipponia nippon | Japanese crested ibis | Ibis, Japanese crested | B01U | V01 | China,Japan,U.S.S.R,North Korea,South Korea | Threskiornithidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Nitrophila mohavensis | Amargosa niterwort | Niterwort, Amargosa | Q2E8 | P01 | CA, NV; U.S.A. (NV, CA) | Chenopodiaceae | May 20, 1985 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Nolina arenicola | Sand sacahuista | Sacahuista, sand | Q19O | P01 | TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Nolina atopocarpa | [Unnamed] beargrass | Beargrass, [unnamed] | Q19P | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Nolina brittoniana | Britton's beargrass | Beargrass, Britton's | Q2E9 | P01 | FL; U.S.A. (FL); Xeric, sandy ridges of central Florida | Agavaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Nolina cismontana | Peninsular beargrass | beargrass, Peninsular | Q3KX | P01 | Liliaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Nolina interrata | Dehesa beargrass | Beargrass, Dehesa | Q19Q | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Nolina sp. | Sp. nov. ined. (chaparral) beargrass | Beargrass, sp. nov. ined. (chaparral) | Q3EQ | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Nothocestrum breviflorum | `Aiea | `Aiea | Q1ZJ | P01 | HI; U.S.A. (HI) | Solanaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Nothocestrum latifolium | `Aiea | `Aiea | Q19R | P01 | HI; | Solanaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Nothocestrum longifolium | `Aiea | `Aiea | Q19S | P01 | HI; | Solanaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nothocestrum peltatum | `Aiea | `Aiea | Q1ZK | P01 | HI; U.S.A. (HI) | Solanaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Nothochrysa californica | San Francisco lacewing | Lacewing, San Francisco | I0LA | I01 | CA; | Chrysopidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Notholaena lemmonii | Lemmon fern cloak | Fern cloak, Lemmon | S00E | P01 | AZ; | Polypodiaceae | NA | Ferns and Allies | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Notholaena schaffneri | No common name | No common name | S00F | P01 | TX; | Polypodiaceae | NA | Ferns and Allies | 2 | Not Listed | 2 | US | P | Wherever found |
| Nothoprocta kalinowskii | Kalinowski's tinamou | Tinamou, Kalinowski's | B0C8 | V01 | Tinamidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Notomys aquilo | Australian native mouse | Mouse, Australian native | A05V | V01 | Australia | Muridae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Notophthalmus meridionalis | Black-spotted newt | Newt, black-spotted | D00Z | V01 | TX; | Salamandridae | NA | Amphibians | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | V | Wherever found |
| Notophthalmus perstriatus | Striped newt | Newt, striped | D02P | V01 | FL, GA; US Counties: Florida - Alachua, Clay, Duval, Jefferson, Lake, Leon, Levy, Marion, Orange, Osceola, Putnam, St. Johns, Sumter, Taylor, Volusia Georgia - Baker, Bryan, Camden, Charlton, Emanuel, Evans, Irwin, Long, Taylor | Salamandridae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Nototrichium humile | Kulu`i | Kulu`i | Q1ZL | P01 | HI; U.S.A. (HI) | Amaranthaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Nototrichium sandwicense decipiens | No common name | No common name | Q19V | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense dubium | No common name | No common name | Q19W | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense forbesii | No common name | No common name | Q19X | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense helleri | No common name | No common name | Q19Y | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense kolekolense | No common name | No common name | Q19Z | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense lanaiense | No common name | No common name | Q1A0 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense lanceolatum | No common name | No common name | Q1A1 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense latifolium | No common name | No common name | Q1A2 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense leptopodum | No common name | No common name | Q1A3 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense longespicatum | No common name | No common name | Q1A4 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense macrophyllum | No common name | No common name | Q1A5 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense mauiense | No common name | No common name | Q1A6 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense niihauense | No common name | No common name | Q2EA | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense olokeleanum | No common name | No common name | Q1A7 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense pulchelloides | No common name | No common name | Q1A8 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense pulchellum | No common name | No common name | Q1A9 | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense subcordatum | No common name | No common name | Q1AA | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium sandwicense syringifolium | No common name | No common name | Q1AB | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Nototrichium viride | No common name | No common name | Q1AC | P01 | HI; | Amaranthaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Notropis albizonatus | Palezone shiner | Shiner, palezone | E04E | V01 | AL, KY; Little South Fork river system in south-central Kentucky and Paint Rock River system in Alabama.; U.S.A. (TN, KY, AL) | Cyprinidae | Apr 27, 1993 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Notropis ariommus | Popeye shiner | shiner, Popeye | E0CR | V01 | GA, KY, OH, TN, VA, WV; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | V | Wherever found |
| Notropis asperifrons | Burrhead shiner | Shiner, burrhead | E07N | V01 | AL, GA, TN; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Notropis buccula | Smalleye Shiner | Shiner, smalleye | E05Z | V01 | TX; | Cyprinidae | Aug 04, 2014 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Notropis cahabae | Cahaba shiner | Shiner, Cahaba | E04C | V01 | AL; U.S.A. (AL) | Cyprinidae | Oct 25, 1990 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Notropis chihuahua | Chihuahua shiner | Shiner, Chihuahua | E04D | V01 | TX; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Notropis girardi | Arkansas River shiner | Shiner, Arkansas River | E05X | V01 | AR, KS, NM, OK, TX; U.S.A. (TX, OK, NM, KS, AR) | Cyprinidae | Nov 23, 1998 | Fishes | 2 | Threatened | 2, 4, 6 | US | V | Arkansas River Basin (AR, KS, NM, OK, TX) |
| Notropis hypsilepis | Highscale shiner | Shiner, highscale | E09I | V01 | AL, GA; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Notropis jemezanus | Rio Grande shiner | Shiner, Rio Grande | E04I | V01 | NM, TX; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Notropis mekistocholas | Cape Fear shiner | Shiner, Cape Fear | E01N | V01 | NC; U.S.A. (NC) | Cyprinidae | Sep 25, 1987 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Notropis melanostomus | Blackmouth shiner | Shiner, blackmouth | E07M | V01 | FL; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Notropis orca | Phantom shiner | Shiner, phantom | E04G | V01 | NM, TX; Believed to be extinct | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Notropis oxyrhynchus | Sharpnose Shiner | Shiner, sharpnose | E04K | V01 | TX; | Cyprinidae | Aug 04, 2014 | Fishes | 2 | Endangered | 2 | US | V | Wherever found |
| Notropis ozarcanus | Ozark shiner | Shiner, Ozark | E07P | V01 | AR, MO; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 3, 4 | US | V | Wherever found |
| Notropis perpallidus | Colorless shiner | Shiner, colorless | E01O | V01 | AR, OK; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | V | Wherever found |
| Notropis semperasper | Roughhead shiner | Shiner, roughhead | E07Q | V01 | VA; | Cyprinidae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Notropis simus pecosensis | Pecos bluntnose shiner | Shiner, Pecos bluntnose | E04F | V01 | NM; U.S.A. (NM) | Cyprinidae | Feb 20, 1987 | Fishes | 2 | Threatened | 2 | US | V | Wherever found |
| Notropis simus simus | Rio Grande bluntnose shiner | Shiner, Rio Grande bluntnose | E04J | V01 | NM; Believed to be extinct | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Wherever found |
| Notropis suttkusi | Rocky shiner | shiner, Rocky | E0CS | V01 | AR, OK; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | V | Wherever found |
| Notropis topeka (=tristis) | Topeka shiner | Shiner, Topeka | E07R | V01 | IA, KS, MN, MO, NE, SD; U.S.A. (SD, NE, MO, MN, KS, IA) | Cyprinidae | Dec 15, 1998 | Fishes | 6 | Endangered | 3, 6 | US | V | Wherever found, except where listed as an experimental population |
| Notropis topeka (=tristis) | Topeka shiner | Shiner, Topeka | E07R | V02 | Cyprinidae | Jul 17, 2013 | Fishes | 3 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (MO-specified portions of Little Creek, Big Muddy Creek, and Spring Creek watersheds in Adair, Gentry, Harrison, Putnam, Sullivan, and Worth Counties; see 17.84(d)(1)(i)) | |
| Noturus baileyi | Smoky madtom | Madtom, smoky | E02C | V01 | NC, TN; U.S.A. (TN) | Ictaluridae | Oct 26, 1984 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Noturus baileyi | Smoky madtom | Madtom, smoky | E02C | V02 | TN; U.S.A. (TN) | Ictaluridae | Aug 12, 2002 | Fishes | 4 | Experimental Population, Non-Essential | 4 | US | V | The Tellico River, between the backwaters of the Tellico Reservoir (approximately Tellico River mile 19 (30.4 kilometers) and Tellico River mile 33 (52.8 kilometers), near the Tellico Ranger Station, Monroe County, Tennessee. |
| Noturus crypticus | Chucky Madtom | Madtom, chucky | E07F | V01 | TN; U.S.A. (TN) | Ictaluridae | Sep 08, 2011 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Noturus fasciatus | Saddled madtom | Madtom, saddled | E07G | V01 | TN; | Ictaluridae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | saddled |
| Noturus flavipinnis | Yellowfin madtom | Madtom, yellowfin | E01Y | V01 | TN, VA; U.S.A. (VA, TN) | Ictaluridae | Oct 11, 1977 | Fishes | 4 | Threatened | 4, 5 | US | V | Wherever found, except where listed as an experimental population |
| Noturus flavipinnis | Yellowfin madtom | Madtom, yellowfin | E01Y | V02 | TN, VA; U.S.A. (VA, TN) | Ictaluridae | Aug 04, 1988 | Fishes | 4 | Experimental Population, Non-Essential | 4, 5 | US | V | U.S.A. (TN, VA-specified portions of the Holston River and watershed; see 17.84(e)(1)(i)) |
| Noturus flavipinnis | Yellowfin madtom | Madtom, yellowfin | E01Y | V03 | TN; U.S.A. (VA, TN) | Ictaluridae | Aug 12, 2002 | Fishes | 4 | Experimental Population, Non-Essential | 4 | US | V | U.S.A. (TN-specified portions of the Tellico River; see 17.84(e)(1)(ii)) |
| Noturus flavipinnis | Yellowfin madtom | Madtom, yellowfin | E01Y | V04 | U.S.A. (VA, TN) | Ictaluridae | Oct 15, 2007 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(e)(1)(iii)) |
| Noturus furiosus | Carolina madtom | Madtom, Carolina | E03R | V01 | NC; | Ictaluridae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Noturus gilberti | Orangefin madtom | Madtom, orangefin | E01J | V01 | NC, VA; | Ictaluridae | NA | Fishes | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | V | Wherever found |
| Noturus gladiator | Piebald madtom | madtom, Piebald | E0CT | V01 | MS, TN; | Ictaluridae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Noturus insignis ssp. | Spotted madtom | Madtom, spotted | E07H | V01 | NC, VA; | Ictaluridae | NA | Fishes | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Noturus lachneri | Ouachita madtom | Madtom, Ouachita | E01K | V01 | AR; | Ictaluridae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Noturus munitus | Frecklebelly madtom | Madtom, frecklebelly | E01I | V01 | AL, GA, LA, MS, TN; | Ictaluridae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Noturus placidus | Neosho madtom | Madtom, Neosho | E03S | V01 | KS, MO, OK; U.S.A. (OK, MO, KS) | Ictaluridae | May 22, 1990 | Fishes | 6 | Threatened | 2, 3, 6 | US | V | Wherever found |
| Noturus stanauli | Pygmy madtom | Madtom, pygmy | E03T | V01 | TN; U.S.A. (TN) | Ictaluridae | Apr 27, 1993 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Noturus stanauli | Pygmy madtom | Madtom, pygmy | E03T | V02 | U.S.A. (TN) | Ictaluridae | Oct 15, 2007 | Fishes | 4 | Experimental Population, Non-Essential | NA | US | V | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.84(t)(1)(i)) |
| Noturus taylori | Caddo madtom | Madtom, Caddo | E01H | V01 | AR; | Ictaluridae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Noturus trautmani | Scioto madtom | Madtom, Scioto | E01T | V01 | OH; Possibly extinct; U.S.A. (OH) | Ictaluridae | Oct 28, 1975 | Fishes | 3 | Endangered | 3 | US | V | Wherever found |
| Novumbra hubbsi | Olympic mudminnow | Mudminnow, Olympic | E03Y | V01 | WA; | Umbridae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Nucombia plicata | Newcomb's tree snail | Tree snail, Newcomb's | G09X | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Numenius americanus | Long-billed curlew | Curlew, long-billed | B06S | V01 | AZ, CA, CO, IA, ID, KS, LA, MN, MT, ND, NE, NM, NV, OK, OR, SD, TX, UT, WA, WI, WY; | Scolopacidae | NA | Birds | 6 | Not Listed | 1, 2, 3, 4, 6, 8 | US/Foreign | V | Wherever found |
| Numenius borealis | Eskimo curlew | Curlew, Eskimo | B01A | V01 | AK, NE, TX; Alaska and Northern Canada to Argentina; Canada,Central & South America | Scolopacidae | Mar 11, 1967 | Birds | 7 | Endangered | 2, 6, 7 | US/Foreign | V | Wherever found |
| Numenius phaeopus | Whimbrel | Whimbrel | B0JN | V01 | Scolopacidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Numenius tahitiensis | Bristle-thighed curlew | Curlew, bristle-thighed | B08F | V01 | AS; Central Pacific Islands | Scolopacidae | NA | Birds | 7 | Not Listed | 1 | US/Foreign | V | Wherever found |
| Numenius tenuirostris | Slender-billed curlew | Curlew, slender-billed | B0BT | V01 | Wherever found | Scolopacidae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Nuphar lutea ssp. sagittifolia | Yellow Pond lily | lily, Yellow Pond | Q3PG | P01 | NC, SC, VA; | Nymphaeaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | P | Wherever found |
| Nuphar lutea ssp. ulvacea | West Florida cow-lily | cow-lily, West Florida | Q3PH | P01 | AL, FL; | Nymphaeaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Nuphar luteum ulvaceum | No common name | No common name | Q1AD | P01 | FL; | Nymphaeaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Nycticebus pygmaeus | Lesser slow loris | Loris, lesser slow | A06J | V01 | Lorisidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found | |
| Nycticorax nycticorax | Black-crowned Night-Heron | Night-Heron, Black-crowned | B0EU | V01 | Ardeidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| nyctinomops femorosaccus | Pocketed free-tailed bat | bat, Pocketed free-tailed | A0IW | V01 | molossidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Nyctinomops macrotis | Big free-tailed bat | Bat, big free-tailed | A0GR | V01 | CO; Mexico,South America | Molossidae | NA | Mammals | 2 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Nyctophilus howensis | Lord Howe Long-Eared Bat | Bat, Lord Howe Long-Eared | A0JT | V01 | Vespertilionidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Nyctophilus nebulosus | New Caledonia Long-Eared Bat | Bat, New Caledonia Long-Eared | A0JV | V01 | Vespertilionidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Nysius frigatensis | French Frigate Shoal seed bug | Seed bug, French Frigate Shoal | I0DD | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nysius fullawayi | Fullaway's seed bug | Seed bug, Fullaway's | I0DE | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nysius neckerensis | Necker goosefoot seed bug | Seed bug, Necker goosefoot | I0DI | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nysius nihoae | Nihoa nysius seed bug | Seed bug, Nihoa nysius | I0DK | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nysius suffusus | Necker bunchgrass seed bug | Seed bug, Necker bunchgrass | I0DJ | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nysius wekiuicola | Wekiu bug | Bug, Wekiu | I0RH | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Nyssa ursina | Bear gum | Gum, bear | Q3ER | P01 | FL; | Nyssaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Oarisma poweshiek | Poweshiek skipperling | skipperling, Poweshiek | I0W1 | I01 | IA, MI, MN, ND, SD, WI; | Hesperiidae | Nov 24, 2014 | Insects | 3 | Endangered | 3, 6 | US | I | Wherever found |
| Obovaria jacksoniana | Southern hickorynut | Hickorynut, southern | F04H | I01 | AL, AR, LA, MO, MS, OK, TN, TX; | Unionidae | NA | Clams | 2 | Not Listed | 2, 3, 4 | US | I | Wherever found |
| Obovaria retusa | Ring pink (mussel) | Ring pink (mussel) | F00S | I01 | AL, KY, TN; U.S.A. (WV, TN, PA, OH, KY, IN, IL, AL) | Unionidae | Sep 29, 1989 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Obovaria retusa | Ring pink (mussel) | Ring pink (mussel) | F00S | I02 | U.S.A. (WV, TN, PA, OH, KY, IN, IL, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Obovaria subrotunda | Round hickorynut | hickorynut, Round | F04X | I01 | AL, AR, GA, IL, IN, KY, MI, MS, NY, OH, PA, TN, WV; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | I | Wherever found |
| Obovaria unicolor | Alabama hickorynut | hickorynut, Alabama | F04Y | I01 | AL, LA, MS; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Oceanides bryani | Bryan's oceanides seed bug | Seed bug, Bryan's oceanides | I0DC | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oceanides perkinsi | Perkins' oceanides seed bug | Seed bug, Perkins' oceanides | I0DL | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oceanides rugosiceps | Rough-headed oceanides seed bug | Seed bug, rough-headed oceanides | I0DM | I01 | HI; | Lygaeidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oceanodroma castro | Band-rumped storm-petrel | Storm-petrel, band-rumped | B08V | V01 | HI; ; USA (HI) | Hydrobatidae | Oct 31, 2016 | Birds | 1 | Endangered | 1 | US | V | USA (HI) |
| Oceanodroma homochroa | Ashy Storm-petrel | Storm-petrel, Ashy | B0AV | V01 | CA; | Hydrobatidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Ochotona princeps | American pika | pika, American | A0J6 | V01 | CO; | Ochotonidae | NA | Mammals | 1 | Not Listed | 6 | US | V | Wherever found |
| Ochotona princeps barnesi | Barnes' pika | Pika, Barnes' | A0CG | V01 | UT; | Ochotonidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Ochotona princeps cinnamomea | Cinnamon pika | Pika, Cinnamon | A0CH | V01 | UT; | Ochotonidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Ochotona princeps clamosa | Copenhagen Basin pika | Pika, Copenhagen Basin | A0CI | V01 | ID; | Ochotonidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Ochotona princeps lasalensis | La Sal pika | Pika, La Sal | A0CL | V01 | UT; | Ochotonidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Ochotona princeps moorei | Heliotrope pika | Pika, Heliotrope | A0CK | V01 | UT; | Ochotonidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Ochotona princeps nigrescens | Goat Peak pika | Pika, Goat Peak | A0CJ | V01 | NM; | Ochotonidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Ochotona princeps wasatchensis | Wasatch pika | Pika, Wasatch | A0CM | V01 | UT; | Ochotonidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Ochotrichia elongiralla | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0O0 | I01 | AL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ochrosia compta | No common name | No common name | Q1AE | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ochrosia haleakalae | Holei | Holei | Q3ES | P01 | HI; | Apocynaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Ochrosia kilaueaensis | Holei | Holei | Q2UX | P01 | HI; U.S.A. (HI) | Apocynaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Ochrotrichia alsea | Alsea ochrotrichian micro caddisfly | Micro caddisfly, Alsea ochrotrichian | I0A9 | I01 | OR; | Hydroptilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ochrotrichia contorta | Contorted ochrotrichian micro caddisfly | Micro caddisfly, contorted ochrotrichian | I0A3 | I01 | AR, MO; | Hydroptilidae | NA | Insects | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Ochrotrichia phenosa | Deschutes ochrotrichian micro caddisfly | Micro caddisfly, Deschutes ochrotrichian | I0A4 | I01 | OR; Possibly extinct,not reported since 1965 | Hydroptilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ochrotrichia provosti | Provost's ochrotrichian micro caddisfly | Micro caddisfly, Provost's ochrotrichian | I0A5 | I01 | FL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Ochrotrichia susanae | Susan's purse-making microcaddisfly | Microcaddisfly, Susan's purse-making | I0VJ | I01 | Hydroptilidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Ochrotrichia vertreesi | Vertrees's ochrotrichian micro caddisfly | Micro caddisfly, Vertrees's ochrotrichian | I0A6 | I01 | OR; | Hydroptilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ochthebius crassalus | Wing-shoulder minute moss beetle | Minute moss beetle, wing-shoulder | I0AF | I01 | CA; | Hydraenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Ochthebius putnamensis | Putnam minute moss beetle | Minute moss beetle, Putnam | I0AG | I01 | IN; Possibly extinct,not reported since 1965 | Hydraenidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Ochthebius reticulus | Wilbur Springs minute moss beetle | Minute moss beetle, Wilbur Springs | I0AH | I01 | CA; | Hydraenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Odobenus rosmarus ssp. divergens | Pacific walrus | Walrus, Pacific | A0J8 | V01 | AK; | Odobenidae | NA | Mammals | 7 | Not Listed | 7 | US/Foreign | V | Wherever found |
| Odocoileus hemionus cerrosensis | Cedros Island mule Deer | Deer, Cedros Island mule | A04K | V01 | Mexico; Mexico (Cedros Island) | Cervidae | Oct 28, 1975 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Odocoileus virginianus clavium | Key deer | Deer, key | A003 | V01 | FL; Entire | Cervidae | Mar 11, 1967 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Odocoileus virginianus hiltonensis | Hilton Head white-tailed deer | Deer, Hilton Head white-tailed | A0AW | V01 | SC; | Cervidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Odocoileus virginianus leucurus | Columbian white-tailed deer | Deer, Columbian white-tailed | A002 | V01 | OR, WA; Columbia River (Clark, Cowlitz, Pacific, Skamania, and Wahkiakum Counties, WA, and Clatsop, Columbia, and Multnomah Counties, OR) | Cervidae | Mar 11, 1967 | Mammals | 1 | Threatened | 1 | US | V | Columbia River (Clark, Cowliz, Pacific, Skamania, and Wahkiakum Counties, WA., and Clatsop, Columbia, and Multnomah Counties, OR.) |
| Odocoileus virginianus leucurus | Columbian white-tailed deer | Deer, Columbian white-tailed | A002 | V02 | OR; | Cervidae | Mar 11, 1967 | Mammals | 1 | Recovery | 1 | US | V | Douglas County, Oregon |
| Odocoileus virginianus nigribarbis | Blackbeard Island white-tailed deer | Deer, Blackbeard Island white-tailed | A0AU | V01 | GA; | Cervidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Odocoileus virginianus taurinsulae | Bulls Island white-tailed deer | Deer, Bulls Island white-tailed | A0AV | V01 | SC; | Cervidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Odocoileus virginianus venatoria | Hunting Island white-tailed deer | Deer, Hunting Island white-tailed | A0AX | V01 | SC; | Cervidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Odontophorus strophium | Gorgeted wood-quail | Wood-quail, gorgeted | B0CN | V01 | Colombia | Phasianidae | Nov 29, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Odynerus nigripennis | Black-winged odynerus vespid wasp | Wasp, black-winged odynerus vespid | I0QS | I01 | HI; | Vespidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Odynerus niihauensis | Niihau odynerus vespid wasp | Wasp, Niihau odynerus vespid | I0F6 | I01 | HI; | Vespidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Odynerus radula | Radulan odynerus vespid wasp | Wasp, radulan odynerus vespid | I0QT | I01 | HI; | Vespidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Odynerus soror | Soror odynerus vespid wasp | Wasp, soror odynerus vespid | I0F8 | I01 | HI; | Vespidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oecanthus laricis | Laricis tree cricket | Cricket, laricis tree | I05M | I01 | MI, OH; | Gryllidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Oecetis parva | Little oecetis longhorn caddisfly | Caddisfly, little oecetis longhorn | I040 | I01 | FL; Possibly extinct,not reported since 1965 | Leptoceridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Oechalia grisea | Gray oechalia stink bug | Stink bug, gray oechalia | I0QP | I01 | HI; | Pentatomidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oechalia patruelis | Patruelis oechalia stink bug | Stink bug, patruelis oechalia | I0QQ | I01 | HI; | Pentatomidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oeneis chryxus valerata | Chryxus arctic butterfly | Butterfly, chryxus arctic | I008 | I01 | WA; | Nymphalidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oenothera acutissima | Narrowleaf evening-primrose | Evening-primrose, Narrowleaf | Q2Q7 | P01 | CO, UT; | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Oenothera avita ssp. eurekensis | Eureka Valley evening-primrose | Evening-primrose, Eureka Valley | Q1ZM | P01 | CA; U.S.A. (CA) | Onagraceae | May 27, 1978 | Flowering Plants | 8 | Recovery | 8 | US | P | Entire |
| Oenothera deltoides ssp. howellii | Antioch Dunes evening-primrose | Evening-primrose, Antioch Dunes | Q1ZN | P01 | CA; U.S.A. (CA) | Onagraceae | May 27, 1978 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Oenothera kleinii | Klein's evening-primrose | Evening-primrose, Klein's | Q2UY | P01 | CO; Possibly extinct | Onagraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Oenothera organensis | Organ Mountain evening-primrose | Evening-primrose, Organ Mountain | Q1AF | P01 | NM; | Onagraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Oenothera pilosella sessilis | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q1AG | P01 | AR, LA, TX; | Onagraceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Oenothera psammophila | [Unnamed] evening-primrose | Evening-primrose, [unnamed] | Q1AH | P01 | ID; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Oenothera wolfii | Wolf's evening-primrose | Evening-primrose, Wolf's | Q2EB | P01 | CA, OR; | Onagraceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Oeobia dryadopa | `Ohenaupaka oeobian moth | Moth, `Ohenaupaka oeobian | I0BG | I01 | HI; | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Ogaridiscus subrupicola | Southern Tightcoil | Tightcoil Southern | G0DW | I01 | Zonitidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oliarces clara | Cheese-weed moth lacewing | Lacewing, Cheese-weed moth | I07U | I01 | AZ, CA; | Ithonidae | NA | Insects | 1 | Not Listed | 2, 8 | US | I | Wherever found |
| Oliarus consimilis | Kauai parti-colored oliarus planthopper | Planthopper, Kauai parti-colored oliarus | I0BV | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oliarus discrepans | Oliarus wild cotton planthopper | Planthopper, oliarus wild cotton | I0BW | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oliarus lanaiensis | Lanai oliarus planthopper | Planthopper, Lanai oliarus | I0C0 | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oliarus lihue | Lihue oliarus planthopper | Planthopper, Lihue oliarus | I0BX | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oliarus myoporicola | Barber's Point oliarus planthopper | Planthopper, Barber's Point oliarus | I0BY | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oliarus priola | Priolan oliarus planthopper | Planthopper, priolan oliarus | I0BZ | I01 | HI; | Cixiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oligophlebodes mostbento | Tombstone Prairie oligophlebodes caddisfly | Caddisfly, Tombstone Prairie oligophlebodes | I04F | I01 | OR; | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides anastrepta | Molokai sedge omoides moth | Moth, Molokai sedge omoides | I0BA | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides anastreptoides | Kohala Mountain sedge omoides moth | Moth, Kohala Mountain sedge omoides | I0AZ | I01 | HI; | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides asaphombra | `Ohe omoides moth | Moth, `Ohe omoides | I0BF | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides euryprora | Ola`a banana omoides moth | Moth, Ola`a banana omoides | I0BC | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides fullawayi | Fullaway's banana omoides moth | Moth, Fullaway's banana omoides | I0AQ | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides giffardi | Giffard's `ohe omoides moth | Moth, Giffard's `ohe omoides | I0AR | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides iridias | Kilauea pa`iniu omoides moth | Moth, Kilauea pa`iniu omoides | I0AY | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides meyricki | Meyrick's banana omoides moth | Moth, Meyrick's banana omoides | I0B7 | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides monogona | Hawaiian bean leafroller | Leafroller, Hawaiian bean | I083 | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides musicola | Maui banana omoides moth | Moth, Maui banana omoides | I0B6 | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Omoides pritchardii | Hawaiian lo`ulu omoides moth | Moth, Hawaiian lo`ulu omoides | I0AT | I01 | HI; Possibly extinct,not reported since 1965 | Pyralidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| omus dejeanii | (Omus dejeanii) ground beetle | ground beetle, (Omus dejeanii) | I0U4 | I01 | carabidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Oncidium carthagenense | Coot Bay dancing-lady | Dancing-lady, Coot Bay | Q2EC | P01 | FL; Central America,Mexico,South America | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Oncopodura cruciata | No common name | No common name | I0VB | I01 | Oncopoduridae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | Salmon, coho | E08A | V01 | CA; North Pacific Basin from U.S.A. (CA to AK) to Russia and Japan | Salmonidae | Nov 20, 1996 | Fishes | NMFS | Endangered | 8 | US | V | Central California Coast ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | Salmon, coho | E08A | V02 | CA; North Pacific Basin from U.S.A. (CA to AK) to Russia and Japan | Salmonidae | Jun 18, 1997 | Fishes | NMFS | Threatened | 8 | US | V | Southern Oregon - Northern California Coast ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | Salmon, coho | E08A | V03 | OR; North Pacific Basin from U.S.A. (CA to AK) to Russia and Japan | Salmonidae | Apr 13, 2011 | Fishes | NMFS | Threatened | 1 | US | V | Oregon Coast ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | Salmon, coho | E08A | V04 | North Pacific Basin from U.S.A. (CA to AK) to Russia and Japan | Salmonidae | Jun 28, 2005 | Fishes | NMFS | Threatened | NA | US | V | Lower Columbia River ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V01 | North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | NA | US | V | California Central Valley DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V02 | OR, WA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | 1 | US | V | Snake River Basin DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V03 | CA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | 8 | US | V | Central California Coast DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V04 | OR, WA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | 1 | US | V | Lower Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V05 | North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | NA | US | V | South-Central California Coast DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V06 | CA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Endangered | 8 | US | V | Southern California DPS - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V07 | WA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Jun 17, 1998 | Fishes | NMFS | Threatened | 1 | US | V | Upper Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V08 | OR, WA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Upper Willamette River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V09 | OR; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Middle Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V10 | CA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | Aug 07, 2000 | Fishes | NMFS | Threatened | 8 | US | V | Northern California DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V11 | CA, OR; | Salmonidae | NA | Fishes | NMFS | Under Review in the Candidate or Petition Process | 1, 8 | US | V | Klamath Mountains Province steelhead(Oncorhynchus mykiss).Includes all Naturally spawned populations of Steelhead (and their progeny) in coastal river basins ranging from the Elk River in Curry County, Oregon, to the Klamath River, inclusive, in Del Norte County, California |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V13 | WA; North Pacific Ocean from the Kamchatka Peninsula in Asia to the northern Baja Peninsula | Salmonidae | May 07, 2007 | Fishes | NMFS | Threatened | 1 | US | V | Puget Sound DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead | Steelhead | E08D | V14 | Salmonidae | Jan 15, 2013 | Fishes | NMFS | Experimental Population, Non-Essential | NA | US | V | Middle Columbia River DPS - XN - See 50 CFR 223.102 | |
| Oncorhynchus (=Salmo) nerka | Sockeye salmon | Salmon, sockeye | E06Y | V01 | OR, WA; North Pacific Basin from U.S.A. (CA) to Russia | Salmonidae | Jan 03, 1992 | Fishes | NMFS | Endangered | 1 | US | V | Snake River ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) nerka | Sockeye salmon | Salmon, sockeye | E06Y | V02 | WA; North Pacific Basin from U.S.A. (CA) to Russia | Salmonidae | Mar 25, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Ozette Lake ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) nerka | Sockeye salmon | Salmon, sockeye | E06Y | V03 | Salmonidae | NA | Fishes | 1 | Not Listed | NA | US | V | Lake Sammamish and Lake Washington | |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V01 | OR, WA; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Apr 22, 1992 | Fishes | NMFS | Threatened | 1 | US | V | Snake River fall-run ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V02 | OR, WA; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Apr 22, 1992 | Fishes | NMFS | Threatened | 1 | US | V | Snake River spring/summer-run ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V03 | North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Apr 06, 1990 | Fishes | NMFS | Endangered | NA | US | V | Sacramento River winter-run ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V04 | WA; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Puget Sound ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V05 | OR, WA; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Lower Columbia River ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V06 | OR; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Upper Willamette River ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V07 | WA; North America from Ventura River in California to Point Hope, Alaska, and the Mackenzie River area in Canada; northeast Asia from Hokkaido, Japan, to the Anadyr River, Russia | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Endangered | 1 | US | V | Upper Columbia River spring-run ESU See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V08 | Salmonidae | Dec 29, 1999 | Fishes | NMFS | Threatened | NA | US | V | Central Valley spring-run ESU See 50 CFR 223.102 | |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | Salmon, Chinook | E06D | V09 | CA; | Salmonidae | Dec 29, 1999 | Fishes | NMFS | Threatened | 8 | US | V | California Coastal ESU - See 50 CFR 223.102 |
| Oncorhynchus aguabonita whitei | Little Kern golden trout | Trout, Little Kern golden | E01Z | V01 | CA; U.S.A. (CA) | Salmonidae | May 15, 1978 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Oncorhynchus apache | Apache trout | Trout, Apache | E00D | V01 | AZ; U.S.A. (AZ) | Salmonidae | Mar 11, 1967 | Fishes | 2 | Threatened | 2 | US | V | Wherever found |
| Oncorhynchus clarki ssp. | Alvord cutthroat trout | Trout, Alvord cutthroat | E064 | V01 | NV, OR; Believed to be extinct | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Alvord |
| Oncorhynchus clarkii | Snake River fine-spotted cutthroat trout | Trout, Snake River fine-spotted cutthroat | E082 | V01 | ID, WY; | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 6 | US | V | Snake River |
| Oncorhynchus clarkii | Willow/Whitehorse cutthroat trout | Trout, Willow/Whitehorse cutthroat | E06B | V01 | OR; | Salmonidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Willow/Whitehorse |
| Oncorhynchus clarkii bouvieri | Yellowstone cutthroat trout | Trout, Yellowstone cutthroat | E0A0 | V01 | Salmonidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| Oncorhynchus clarkii clarkii | Coastal cutthroat Trout | Trout, coastal cutthroat | E08C | V01 | OR; | Salmonidae | Sep 13, 1996 | Fishes | 1 | Original Data in Error - Taxonomic Revision | 1 | US | V | Umpqua R. (U.S.A._OR) naturally spawning populations in mainstem and tributaries |
| Oncorhynchus clarkii clarkii | Coastal cutthroat Trout | Trout, coastal cutthroat | E08C | V02 | WA; | Salmonidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Southwestern WA/Columbia R. (U.S.A._OR, WA) naturally spawning populations (and their progeny) below natural barriers in Columbia R. and its tributaries downstream from Klickitat R. (WA) and Fifteenmile Cr. (OR), inclusive, including Willamette R. downstream from Willamette Falls, and in coastal drainages between Columbia R. and Grays Harbor (WA), inclusive |
| Oncorhynchus clarkii henshawi | Lahontan cutthroat trout | Trout, Lahontan cutthroat | E00Y | V01 | CA, NV, OR, UT; U.S.A. (UT, OR, NV, CA) | Salmonidae | Oct 13, 1970 | Fishes | 8 | Threatened | 1, 6, 8 | US | V | Wherever found |
| Oncorhynchus clarkii lewisi | Westslope cutthroat trout | Trout, westslope cutthroat | E09P | V01 | ID, MT, OR, WA, WY; Canada (Alb,B.C.) | Salmonidae | Mar 11, 1967 | Fishes | 6 | Not Listed | 1, 6 | US/Foreign | V | Wherever found |
| Oncorhynchus clarkii macdonaldi | Yellowfin cutthroat trout | Trout, yellowfin cutthroat | E09T | V01 | CO; Believed to be extinct | Salmonidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Wherever found |
| Oncorhynchus clarkii pleuriticus | Colorado River cutthroat trout | Trout, Colorado River cutthroat | E09M | V01 | CO, UT, WY; | Salmonidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Wherever found |
| Oncorhynchus clarkii seleniris | Paiute cutthroat trout | Trout, Paiute cutthroat | E00G | V01 | CA; U.S.A. (CA) | Salmonidae | Mar 11, 1967 | Fishes | 8 | Threatened | 8 | US | V | Wherever found |
| Oncorhynchus clarkii stomias | Greenback Cutthroat trout | trout, Greenback Cutthroat | E00F | V01 | CO, UT; U.S.A. (CO) | Salmonidae | Mar 11, 1967 | Fishes | 6 | Threatened | 6 | US | V | Wherever found |
| Oncorhynchus clarkii utah | Bonneville cutthroat trout | Trout, Bonneville cutthroat | E025 | V01 | ID, NV, UT, WY; | Salmonidae | NA | Fishes | 6 | Not Listed | 1, 6, 8 | US | V | Wherever found |
| Oncorhynchus clarkii virginalis | Rio Grande cutthroat trout | Trout, Rio Grande cutthroat | E05D | V01 | CO, NM; | Salmonidae | NA | Fishes | 2 | Not Listed | 2, 6 | US | V | Wherever found |
| Oncorhynchus gilae | Gila trout | Trout, Gila | E00E | V01 | AZ, NM; U.S.A. (NM, AZ) | Salmonidae | Mar 11, 1967 | Fishes | 2 | Threatened | 2 | US | V | Wherever found |
| Oncorhynchus keta | Chum salmon | Salmon, chum | E09Q | V01 | OR, WA; North Pacific Rim from Korea and the Japanese Island of Honshu east to Monterey Bay, California; Arctic Ocean from the Laptev Sea in Russia to Mackenzie River in Canada | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Columbia River ESU See 50 CFR 223.102 |
| Oncorhynchus keta | Chum salmon | Salmon, chum | E09Q | V02 | WA; North Pacific Rim from Korea and the Japanese Island of Honshu east to Monterey Bay, California; Arctic Ocean from the Laptev Sea in Russia to Mackenzie River in Canada | Salmonidae | Aug 02, 1999 | Fishes | NMFS | Threatened | 1 | US | V | Hood Canal summer-run ESU - See 50 CFR 223.102 |
| Oncorhynchus mykiss aguabonita | California golden trout trout | Trout, California golden trout | E083 | V01 | CA; Kern River Drainage (Golden trout creek, formally known as volcano creek) | Salmonidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Oncorhynchus mykiss aquilarum | Eagle Lake rainbow Trout | Trout, Eagle Lake rainbow | E09N | V01 | CA; | Salmonidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Oncorhynchus mykiss gairdnerii | Columbia River Redband | Trout, Columbia River redband | E0A8 | V01 | Salmonidae | NA | Fishes | 1 | Not Listed | NA | US | V | Wherever found | |
| Oncorhynchus mykiss gibbsi | Interior redband trout | Trout, interior redband | E080 | V01 | ID, MT, NV, OR; | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 6, 8 | US | V | Wherever found |
| Oncorhynchus mykiss gilberti | Kern River rainbow trout | Trout, Kern River rainbow | E06W | V01 | CA; | Salmonidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Oncorhynchus mykiss ssp. | Catlow Valley redband trout | Trout, Catlow Valley redband | E07Y | V01 | OR; | Salmonidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Catlow Valley |
| Oncorhynchus mykiss ssp. | McCloud R. redband trout | Trout, McCloud R. redband | E081 | V01 | CA; | Salmonidae | NA | Fishes | 1 | Not Listed | 8 | US | V | McCloud R. |
| Oncorhynchus mykiss ssp. | Great Basin redband trout | Trout, Great Basin redband | E09Y | V01 | Salmonidae | NA | Fishes | 1 | Not Listed | NA | V | Wherever found | ||
| Oncorhynchus mykiss ssp. | Warner Valley redband trout | Trout, Warner Valley redband | E084 | V01 | CA, NV, OR; | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Oncorhynchus mykiss ssp. | Goose Lake redband trout | Trout, Goose Lake redband | E07Z | V01 | CA, OR; | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 8 | US | V | Goose Lake |
| oncorhynchus mykiss ssp. irideus | Coastal rainbow trout | trout, Coastal rainbow | E0AP | V01 | salmonidae | NA | Fishes | 7 | Not Listed | NA | US | V | Wherever found | |
| Ondatra zibethicus ripensis | Pecos River muskrat | Muskrat, Pecos River | A0H4 | V01 | NM, TX; | Cricetidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Onosmodium helleri | No common name | No common name | Q1AI | P01 | TX; | Boraginaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Onosmodium molle molle | No common name | No common name | Q1AJ | P01 | AL, IL, KY, TN; | Boraginaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Onthophagus polyphemi | Onthophagus tortoise commensal scarab | Scarab, Onthophagus tortoise commensal | I0D5 | I01 | AL, FL, GA, MS, SC; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Onychobaris langei | Lange's El Segundo Dune weevil | Weevil, Lange's El Segundo Dune | I0FT | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Onychogalea fraenata | Brindled nail-tailed wallaby | Wallaby, brindled nail-tailed | A03Q | V01 | Australia | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Onychogalea lunata | Crescent nail-tailed wallaby | Wallaby, crescent nail-tailed | A03R | V01 | Australia | Macropodidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Onychomys torridus ramona | Southern grasshopper mouse | Mouse, southern grasshopper | A0GE | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Onychomys torridus tularensis | Tulare grasshopper mouse | Mouse, Tulare grasshopper | A0H3 | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Oodemas breviscapum | Nihoa oodemas weevil | Weevil, Nihoa oodemas | I0G3 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oodemas erro | Wandering oodemas weevil | Weevil, wandering oodemas | I0GI | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oodemas laysanensis | Laysan oodemas weevil | Weevil, Laysan oodemas | I0FU | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oodemas neckeri | Necker oodemas weevil | Weevil, Necker oodemas | I0G0 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Oonopsis engelmannii | Engelmann's goldenrod | Goldenrod, Engelmann's | Q3DE | P01 | CO, KS; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Operculina turpethum var. turpethum | St. Thomas lidpod | No common name | Q1AK | P01 | VI; | Convolvulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ophioglossum concinnum | [Unnamed] adder's-tongue | Adder's-tongue, [unnamed] | S00G | P01 | HI; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Ophioglossum lusitanicum | California adder's-tongue | Adder's-tongue, California | S00H | P01 | CA; | Ophioglossaceae | NA | Ferns and Allies | 1 | Not Listed | 8 | US | P | Wherever found |
| Ophioglossum nudicaule | No common name | No common name | S01A | P01 | FL; Cuba,Mexico,Philippines,Africa,South America | Ophioglossaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Ophiogomphus anomalus | Extra-striped snaketail | Snaketail, extra-striped | I0LZ | I01 | DE, ME, NJ, NY, PA, WI; | Gomphidae | NA | Insects | 3 | Not Listed | 3, 5 | US/Foreign | I | Wherever found |
| Ophiogomphus australis | Southern snaketail | snaketail, Southern | I0WU | I01 | FL, LA, MS; | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Ophiogomphus edmundo | Edmund's snaketail | Snaketail, Edmund's | I0DU | I01 | GA, NC, SC; Possibly extinct,not reported since 1965 | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Ophiogomphus howei | Midget snaketail | Snaketail, midget | I0DV | I01 | KY, MA, ME, NC, NY, PA, TN, VA, WI; | Gomphidae | NA | Insects | 4 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Ophiogomphus incurvatus | Appalachian snaketail | snaketail, Appalachian | I0X9 | I01 | AL, GA, KY, MD, NC, PA, VA, WV; | Gomphidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Ophiogomphus incurvatus alleghaniensis | Alleghany snaketail | Snaketail, Alleghany | I0DW | I01 | AL, GA, TN, VA, WV; | Gomphidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Ophiogomphus sp. | St. Croix snaketail | Snaketail, St. Croix | I0OK | I01 | MN, WI; | Gomphidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Ophiogomphus westfalli | Ozark snaketail | Snaketail, Ozark | I0M0 | I01 | AR, KS, MO; | Gomphiidae | NA | Insects | 4 | Not Listed | 3, 4, 6 | US | I | Wherever found |
| Ophisaurus compressus | Island glass lizard | Lizard, island glass | C04Y | V01 | FL, GA, SC; | Anguidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Ophisaurus mimicus | Mimic glass lizard | Lizard, mimic glass | C05T | V01 | AL, FL, GA, LA, MS, NC, SC; | Anguidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| oporornis tolmiei | Macgillivray's warbler | warbler, Macgillivray's | B0F4 | V01 | fringillidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Optioservus browni | Brown's optioservus riffle beetle | Riffle beetle, Brown's optioservus | I0CE | I01 | AR; | Elmidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Optioservus canus | Pinnacles optioservus riffle beetle | Riffle beetle, Pinnacles optioservus | I0CF | I01 | CA; | Elmidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Optioservus phaeus | Scott optioservus riffle beetle | Riffle beetle, Scott optioservus | I0CG | I01 | KS; | Elmidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Opuntia arenaria | Sand prickly-pear | Prickly-pear, sand | Q1AL | P01 | NM, TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Opuntia aureispina | Golden-spined prickly-pear | Prickly-pear, golden-spined | Q36G | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia basilaris brachyclada | Short-jointed beavertail cactus | Beavertail cactus, short-jointed | Q1AM | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Opuntia basilaris longiareolata | No common name | No common name | Q1AN | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia basilaris woodburyi | No common name | No common name | Q2ED | P01 | UT; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Opuntia bigelovii hoffmannii | Hoffmann's cactus | Cactus, Hoffmann's | Q2EE | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Opuntia borinquensis | Olaga | Olaga | Q1AO | P01 | PR, VI; | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Opuntia engelmannii flexospina | Marble-seeded, few-spined prickly-pear | Prickly-pear, marble-seeded, few-spined | Q3ET | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia heacockul | No common name | No common name | Q3EU | P01 | CO; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Opuntia imbricata argentea | Silver cholla | Cholla, silver | Q1AP | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia lindheimeri linguiformis | Cow-tongue prickly-pear | Prickly-pear, cow-tongue | Q2UZ | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia munzii | Munz cholla | Cholla, Munz | Q1AQ | P01 | CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Opuntia parryi serpentina | Snake cholla | Cholla, snake | Q1AR | P01 | CA; Mexico (Baja California) | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Opuntia phaeacantha flavispina | No common name | No common name | Q1AS | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia phaeacantha mojavensis | No common name | No common name | Q2EF | P01 | AZ, CA; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Opuntia phaeacantha superbospina | No common name | No common name | Q1AT | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia pulchella | Sand cholla | Cholla, sand | Q2EG | P01 | AZ, CA, NV, UT; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Opuntia spinosissima | No common name | No common name | Q1AU | P01 | FL; | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Opuntia treleasei | Bakersfield cactus | Cactus, Bakersfield | Q2YG | P01 | CA; U.S.A. (CA) | Cactaceae | Jul 19, 1990 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Opuntia triacantha | No common name | No common name | Q1AV | P01 | FL, PR, VI; Guadeloupe,Lesser Antilles | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Opuntia viridiflora | Santa Fe cholla | Cholla, Santa Fe | Q36H | P01 | NM; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Opuntia wigginsii | Wiggins' cholla | Cholla, Wiggins' | Q2EH | P01 | AZ, CA; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Opuntia X multigeniculata | Blue Diamond cholla | Cholla, Blue Diamond | Q1AW | P01 | NV; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oravelia pege | Dry Creek cliff strider bug | Bug, Dry Creek cliff strider | I02V | I01 | CA; | Macroveliidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Orbexilum macrophyllum | Bigleaf scurf-pea | Scurf-pea, Bigleaf | Q1K6 | P01 | NC; Possibly extinct | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Orbexilum macrophyllum | Bigleaf scurfpea | Scurfpea, bigleaf | Q1AX | P01 | IN, KY; Believed to be extinct | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Orbicella annularis | Lobed Star Coral | Coral, Lobed Star | P003 | I01 | Caribbean, Bahamas, and Flower Garden Banks | Faviidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | US/Foreign | I | Wherever found |
| Orbicella faveolata | Mountainous Star Coral | Coral, Mountainous Star | P004 | I01 | Faviidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | US/Foreign | I | Wherever found | |
| Orbicella franksi | Boulder star coral | coral, Boulder star | P01Y | I01 | Merulinidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | US/Foreign | I | Wherever found | |
| Orbittacus obscurus | Gold rush hanging fly | Hanging fly, Gold rush | I0L6 | I01 | CA; | Bittacidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Orcinus orca | Killer whale | Whale, killer | A0IL | V01 | WA; Marine waters adjacent to the identified counties. ; Pacific Ocean | Delphinidae | Feb 16, 2006 | Mammals | NMFS | Endangered | 1 | US/Foreign | V | Southern Resident DPS See 50 CFR 224.101 |
| orconectes australis ssp. australis | Southern cave crayfish | crayfish, Southern cave | E0AV | V01 | cambaridae | NA | Fishes | 4 | Not Listed | NA | US | V | Wherever found | |
| Orconectes blacki | Calcasieu crayfish | crayfish, Calcasieu | K06X | I01 | LA; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Orconectes burri | Blood River crayfish | Crayfish, Blood River | K062 | I01 | KY, TN; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Orconectes deanae | Conchas crayfish | Crayfish, Conchas | K01Q | I01 | NM; | Cambaridae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Orconectes hartfieldi | Yazoo crayfish | crayfish, Yazoo | K06Z | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Orconectes incomptus | Tennessee Cave crayfish | crayfish, Tennessee Cave | K070 | I01 | TN; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Orconectes indianensis | Indiana crayfish | Crayfish, Indiana | K03S | I01 | IL, IN; | Cambaridae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Orconectes jeffersoni | Louisville crayfish | Crayfish, Louisville | K01R | I01 | KY; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Orconectes jonesi | Sucarnoochee River crayfish | crayfish, Sucarnoochee River | K071 | I01 | AL, MS; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Orconectes maletae | Kisatchie Painted crayfish | crayfish, Kisatchie Painted | K072 | I01 | LA, TX; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | I | Wherever found |
| Orconectes marchandi | Mammoth Spring crayfish | crayfish, Mammoth Spring | K073 | I01 | AR, MO; | Cambaridae | NA | Crustaceans | 3 | Under Review in the Candidate or Petition Process | 3, 4 | US | I | Wherever found |
| Orconectes packardi | Appalachian Cave crayfish | crayfish, Appalachian Cave | K074 | I01 | KY; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Orconectes saxatilis | Kiamichi Crayfish | Crayfish, Kiamichi | K07Q | I01 | Cambaridae | NA | Crustaceans | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Orconectes sheltae | Shelta Cave crayfish | Crayfish, Shelta Cave | K03V | I01 | AL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Orconectes shoupi | Nashville crayfish | Crayfish, Nashville | K01S | I01 | TN; U.S.A. (TN) | Cambaridae | Sep 26, 1986 | Crustaceans | 4 | Endangered | 4 | US | I | Wherever found |
| Orconectes virginiensis | Chowanoke crayfish | Crayfish, Chowanoke | K03O | I01 | NC, VA; | Cambaridae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Orconectes williamsi | [Unnamed] crayfish | Crayfish, [unnamed] | K035 | I01 | AR, MO; | Camabaridae | NA | Crustaceans | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Orconectes wrighti | Hardin crayfish | crayfish, Hardin | K075 | I01 | MS, TN; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Orcuttia californica | California Orcutt grass | Orcutt grass, California | Q1ZO | P01 | CA; U.S.A. (CA) | Poaceae | Aug 03, 1993 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Orcuttia inaequalis | San Joaquin Orcutt grass | Orcutt grass, San Joaquin | Q1ZP | P01 | CA; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Orcuttia pilosa | Hairy Orcutt grass | Orcutt grass, hairy | Q1AY | P01 | CA; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Orcuttia tenuis | Slender Orcutt grass | Orcutt grass, slender | Q1AZ | P01 | CA, OR; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Threatened | 1, 8 | US | P | Wherever found |
| Orcuttia viscida | Sacramento Orcutt grass | Orcutt grass, Sacramento | Q1ZQ | P01 | CA; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Oregonichthys crameri | Oregon chub | Chub, Oregon | E06Z | V01 | OR; U.S.A. (OR) | Cyprinidae | Oct 18, 1993 | Fishes | 1 | Recovery | 1 | US | V | Wherever found |
| Oregonichthys kalawatseti | Umpqua Oregon Chub | Chub, Umpqua Oregon | E074 | V01 | OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Oreohelix alpina | Alpine Mountainsnail | Mountainsnail Alpine | G0DX | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix amariradix | Bitterroot Mountainsnail | Mountainsnail Bitterroot | G0DY | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix carinifera | Keeled Mountainsnail | Mountainsnail Keeled | G0DZ | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix elrodi | Carinate Mountainsnail | Mountainsnail Carinate | G0E0 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix eurekensis | Eureka Mountainsnail | Mountainsnail Eureka | G0E1 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix eurekensis eurekensis | Eureka mountainsnail | Mountainsnail, Eureka | G09L | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix eurekensis uinta | Uinta mountainsnail | Mountainsnail, Uinta | G09M | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix florida | Florida mountainsnail | Mountainsnail, Florida | G074 | I01 | NM; | Oreohelicidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Oreohelix grahamensis | Pinaleno mountainsnail | Mountainsnail, Pinaleno | G078 | I01 | AZ; | Oreohelicidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Oreohelix haydeni corugata | [Unnamed] mountainsnail | Mountainsnail, [unnamed] | G09N | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix haydeni haydeni | Lyrate mountainsnail | Mountainsnail, Lyrate | G09O | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix hendersoni | Pallid Mountainsnail | Mountainsnail Pallid | G0E2 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix howardi | Mill Creek Mountainsnail | Mountainsnail Mill Creek | G0E3 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix idahoensis idahoensis | Idaho banded mountainsnail | Mountainsnail, Idaho banded | G02A | I01 | ID; | Oreohelicidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Oreohelix jugalis | Boulder pile mountainsnail | Mountainsnail, boulder pile | G02B | I01 | ID; | Oreohelicidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Oreohelix nevadensis | Schell Creek mountainsnail | Mountainsnail, Schell Creek | G075 | I01 | NV; | Oreohelicidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Oreohelix parawanensis | Brian Head Mountainsnail | Mountainsnail Brian Head | G0E4 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix parowanensis | [Unnamed] mountainsnail | Mountainsnail, [unnamed] | G09P | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix peripherica wasatchensis | Ogden Mountainsnail | Mountainsnail, Ogden | G0C1 | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix peripherica weberiana | Coalville mountainsnail | Mountainsnail, Coalville | G02G | I01 | UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix pilsbryi | Mineral Creek mountainsnail | Mountainsnail, Mineral Creek | G076 | I01 | NM; | Oreohelicidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Oreohelix pygmaea | Pygmy Mountainsnail | Mountainsnail Pygmy | G0E5 | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix sp | Chelan mountainsnail | mountainsnail, Chelan | G0EB | I01 | Oreohelicidae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Oreohelix spfour | Drummond mountainsnail | Mountainsnail, Drummond | G0FY | I01 | Oreohelicidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Oreohelix spthirtyone | Byrne Resort mountainsnail | Mountainsnail, Byrne Resort | G0FW | I01 | MT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix spthree | Bearmouth mountainsnail | Mountainsnail, bearmouth | G0FV | I01 | MT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix strigosa berryi | Berry's mountainsnail | Mountainsnail, Berry's | G09R | I01 | MT, WY; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix strigosa cooperi | Cooper's rocky mountainsnail | Mountainsnail, Cooper's rocky | G077 | I01 | SD, WY; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix strigosa goniogyra | Carinated rocky mountainsnail | Mountainsnail, Carinated rocky | G02C | I01 | ID; | Oreohelicidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Oreohelix strigosa ssp. | Pahasapa mountainsnail | Mountainsnail, Pahasapa | G09Q | I01 | SD, WY; | Oreohelicidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Oreohelix vortex | Whorled mountainsnail | Mountainsnail, whorled | G02D | I01 | ID; | Oreohelicidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Oreohelix waltoni | Lava rock mountainsnail | Mountainsnail, Lava rock | G02E | I01 | ID; | Oreohelicidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Oreohelix yavapai | Yavapai mountainsnail | Mountainsnail, Yavapai | G09S | I01 | AZ, UT; | Oreohelicidae | NA | Snails | 6 | Not Listed | 2, 6 | US | I | Wherever found |
| Oreomystis bairdi | Akikiki | Akikiki | B0AI | V01 | HI; U.S.A. (HI) | Fringillidae | May 13, 2010 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Oreomystis mana | Hawaii creeper | Creeper, Hawaii | B04M | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 28, 1975 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Oreonana purpurascens | Purple mountain parsley | Mountain parsley, purple | Q2EI | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oreophasis derbianus | Horned guan | Guan, horned | B01R | V01 | Mexico, Guatemala | Cracidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Oreortyx pictus | Mountain quail | Quail, mountain | B099 | V01 | CA, ID, NV, OR, WA; | Phasianidae | NA | Birds | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Oreoscoptes montanus | Sage Thrasher | Thrasher, Sage | B0ID | V01 | Mimidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Oreostemma peirsonii | Peirson's aster | Aster, Peirson's | Q04T | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oreoxis humilis | Pikes Peak Spring parsley | parsley Pikes Peak Spring | Q3M8 | P01 | Apiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Oreoxis trotteri | No common name | No common name | Q36I | P01 | UT; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ornithoptera meridionalis | New Guinea birdwing butterfly | Butterfly, New Guinea birdwing | I0RU | I01 | Papilionidae | NA | Insects | 9 | Not Listed | NA | US | I | Wherever found | |
| Orobanche parishii brachyloba | Short-lobed broomrape | Broomrape, short-lobed | Q1B0 | P01 | CA; | Orobanchaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Orobanche valida valida | Rock Creek broomrape | Broomrape, Rock Creek | Q1B1 | P01 | CA; | Orobanchaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ortalis vetula | Utila chachalaca | Chachalaca, Utila | B0CK | V01 | Cracidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Orthalicus reses (not incl. nesodryas) | Stock Island tree snail | Snail, Stock Island tree | G00Y | I01 | FL; U.S.A. (FL) | Bulimulidae | Aug 02, 1978 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Orthocarpus pachystachyus | Shasta orthocarpus | Orthocarpus, Shasta | Q1B2 | P01 | CA; Believed to be extinct | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Orthotrichum keeverae | Keever's bristle-moss | Bristle-moss, Keever's | Q36J | P01 | NC; | Orthotrichaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Oryctes nevadensis | Nevada oryctes | Oryctes, Nevada | Q1B3 | P01 | CA, NV; | Solanaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oryx dammah | Scimitar-horned oryx | Oryx, scimitar-horned | A0G5 | V01 | Wherever found | Bovidae | Sep 02, 2005 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Oryx leucoryx | Arabian oryx | Oryx, Arabian | A01Z | V01 | Wherever found | Bovidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Oryzomys argentatus | Silver rice rat | Rice rat, silver | A0I4 | V01 | Muridae | NA | Mammals | NA | Not Listed | NA | V | Wherever found | ||
| Oryzomys couesi aquaticus | Coues' rice rat | Rice rat, Coues' | A0GH | V01 | TX; | Cricetidae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Oryzomys palustris natator | Rice rat | Rice rat | A083 | V01 | FL; U.S.A. (FL) | Muridae | Apr 30, 1991 | Mammals | 4 | Endangered | 4 | US | V | Lower FL Keys (west of Seven Mile Bridge) |
| Oryzomys palustris planirostris | Pine Island rice rat | Rice rat, Pine Island | A0DQ | V01 | FL; | Muridae | NA | Mammals | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Oryzomys palustris sanibeli | Sanibel Island rice rat | Rice rat, Sanibel Island | A09E | V01 | FL; | Muridae | NA | Mammals | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Osmerus mordax | Pygmy smelt | Smelt, pygmy | E06T | V01 | ME; | Osmeridae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Osmorhiza mexicana bipatriata | Livermore sweet-cicely | Sweet-cicely, Livermore | Q2EJ | P01 | TX; | Apiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Osmoxylon mariannense | No common name | No common name | Q3GZ | P01 | MP; Western Pacific Ocean-U.S.A. (Commonwealth of the Northern Mariana Islands) | Araliaceae | Apr 08, 2004 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Osteolaemus tetraspis osborni | Congo dwarf crocodile | Crocodile, Congo dwarf | C012 | V01 | Congo River drainage | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Osteolaemus tetraspis tetraspis | African dwarf crocodile | Crocodile, African dwarf | C010 | V01 | West Africa | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ostodes strigatus | Snail [no common name] | [no common name] Snail | G0A5 | I01 | AS; | Potaridae | Oct 24, 2016 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Ostroumovia horii | [Unnamed] hydroid | Hydroid, [unnamed] | N000 | I01 | HI; | Moerisiidae | NA | Hydroids | 1 | Not Listed | 1 | US | I | Wherever found |
| Ostrya chisosensis | Big Bend hop hornbeam | Hop hornbeam, Big Bend | Q1B4 | P01 | TX; | Betulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ottoschulzia rhodoxylon | Palo de rosa | Palo de rosa | Q2EK | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR), Dominican Republic | Icacinaceae | Apr 10, 1990 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Otus elegans botelensis | Lanyu Scops owl | Owl, Lanyu Scops | B0CX | V01 | Strigidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Otus flammeolus | Flammulated owl | Owl, Flammulated | B0DK | V01 | Strigidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Otus ireneae | Morden's owlet | Owlet, Morden's | B028 | V01 | Kenya | Aegothelidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Otus magicus (=insularis) insularis | Seychelles scops owl | Owl, Seychelles scops | B027 | V01 | Indian Ocean-Seychelles Islands | Strigidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Otus nudipes newtoni | Virgin Islands screech owl | Owl, Virgin Islands screech | B06F | V01 | PR, VI; | Strigidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Otus rutilus capnodes | Anjouan scops owl | Owl, Anjouan scops | B026 | V01 | Indian Ocean-Comoro Island | Strigidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ovis ammon | Argali | Argali | A00J | V01 | Entire except Kyrgyzstan, Mongolia, and Tajikistan | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found except Kyrgyzstan, Mongolia, and Tajikistan |
| Ovis ammon | Argali | Argali | A00J | V02 | Kyrgyzstan, Mongolia, and Tajikistan | Bovidae | Jun 23, 1992 | Mammals | Foreign | Threatened | NA | Foreign | V | Kyrgyzstan, Mongolia, and Tajikistan |
| Ovis canadensis | Bighorn sheep | Sheep, bighorn | A0J9 | V01 | Bovidae | NA | Mammals | 8 | Not Listed | NA | US | V | Wherever found | |
| Ovis canadensis nelsoni | Peninsular bighorn sheep | Sheep, Peninsular bighorn | A0DR | V01 | CA; U.S.A. (CA) Peninsula Ranges | Bovidae | Mar 18, 1998 | Mammals | 8 | Endangered | 8 | US/Foreign | V | U.S.A. (CA) Peninsular Ranges |
| Ovis canadensis sierrae | Sierra Nevada bighorn sheep | Sheep, Sierra Nevada bighorn | A0DS | V01 | CA; U.S.A. (CA) Sierra Nevada | Bovidae | Apr 20, 1999 | Mammals | 8 | Endangered | 8 | US | V | U.S.A. (CA) Sierra Nevada |
| Ovis musimon ophion | Urial | Urial | A069 | V01 | Cyprus | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ovis vignei vignei | Shapo | Shapo | A065 | V01 | India (Kashmir) | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Oxyethira florida | Florida oxyethiran micro caddisfly | Micro caddisfly, Florida oxyethiran | I0A7 | I01 | FL, TX; | Hydroptilidae | NA | Insects | 4 | Not Listed | 2, 4 | US | I | Wherever found |
| Oxyethira setosa | Setose Cream and Brown Mottle microcaddisfly | microcaddisfly, Setose Cream and Brown Mottle | I0WR | I01 | AL, DE, FL, GA, NJ; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Oxyloma haydeni kanabensis | Kanab ambersnail | Ambersnail, Kanab | G01M | I01 | AZ, UT; U.S.A. (UT, AZ) | Succineidae | Aug 08, 1991 | Snails | 6 | Endangered | 2, 6 | US | I | Wherever found |
| Oxypolis canbyi | Canby's dropwort | Dropwort, Canby's | Q2EL | P01 | DE, GA, MD, NC, SC; U.S.A. (SC, NC, MD, GA, DE) | Apiaceae | Feb 25, 1986 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Oxypolis greenmanii | Giant water-dropwort | Water-dropwort, giant | Q1B5 | P01 | FL; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Oxypolis ternata | No common name | No common name | Q36K | P01 | FL, GA, NC, SC; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Oxytheca caryophylloides | chickweed oxytheca | oxytheca, chickweed | Q3L0 | P01 | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Oxytheca parishii ciengensis | Cienega Seca oxytheca | Oxytheca, Cienega Seca | Q3EV | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oxytheca parishii var. goodmaniana | Cushenbury oxytheca | oxytheca, Cushenbury | Q36L | P01 | CA; U.S.A. (CA) | Polygonaceae | Aug 24, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Oxytheca watsonii | No common name | No common name | Q1B6 | P01 | CA, NV; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Oxytropis besseyi obnapiformis | No common name | No common name | Q1B7 | P01 | CO, UT, WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Oxytropis campestris johannensis | No common name | No common name | Q2EN | P01 | ME; | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Oxytropis campestris var. chartacea | Fassett's locoweed | Locoweed, Fassett's | Q2EM | P01 | WI; U.S.A. (WI) | Fabaceae | Sep 28, 1988 | Flowering Plants | 3 | Threatened | 3 | US | P | Wherever found |
| Oxytropis campestris wanapum | No common name | No common name | Q36M | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Oxytropis glaberrima | No common name | No common name | Q2EO | P01 | AK; | Fabaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Oxytropis kobukensis | Kobuk locoweed | Locoweed, Kobuk | Q1B9 | P01 | AK; | Fabaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Oxytropis kokrinensis | Kokrines oxytrope | Oxytrope, Kokrines | Q1BA | P01 | AK; | Fabaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Oxytropis oreophila var. jonesii | Jones' oxytrope | Oxytrope, Jones' | Q1B8 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Oxytropis sordida barnebyana | No common name | No common name | Q2V2 | P01 | AK; | Fabaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Oxyura jamaicensis jamaicensis | Ruddy Duck | Duck, Ruddy | B084 | V01 | PR, VI; West Indies | Anatidae | NA | Birds | 4 | Not Listed | 4 | US | V | Puerto Rico |
| Ozotoceros bezoarticus | Pampas deer | Deer, pampas | A057 | V01 | Uruguay,Paraguay,Brazil,Bolivia,Argentina | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pacifastacus fortis | Shasta crayfish | Crayfish, Shasta | K01U | I01 | CA; U.S.A. (CA) | Cambaridae | Sep 30, 1988 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Packera antennariifolia | Pussytoes ragwort | Ragwort, pussytoes | Q2IH | P01 | MD, PA, VA, WV; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Packera bernardina | San Bernardino butterweed | Butterweed, San Bernardino | Q1NX | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Packera cardamine | No common name | No common name | Q2II | P01 | AZ, NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Packera castoreus | Beaver Mountain Groundsel | Groundsel Beaver Mountain | Q3M9 | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Packera franciscana | San Francisco Peaks ragwort | Ragwort, San Francisco Peaks | Q21L | P01 | AZ; U.S.A. (AZ) | Asteraceae | Nov 22, 1983 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Packera ganderi | Gander butterweed | Butterweed, Gander | Q1NZ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Packera hartiana | Hart's ragwort | Ragwort, Hart's | Q1O7 | P01 | AZ, NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Packera hesperia | No common name | No common name | Q1O1 | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Packera malmstenii | Podunk Groundsel | Groundsel Podunk | Q3MA | P01 | Asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Packera millefolia | Piedmont ragwort | ragwort, Piedmont | Q1O4 | P01 | GA, NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Packera porteri | Porter's groundsel | Groundsel, Porter's | Q1O6 | P01 | CO, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Packera spellenbergii | Spellenberg's groundsel | Groundsel, Spellenberg's | Q3FO | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paduniella nearctica | Nearctic paduniellan caddisfly | Caddisfly, nearctic paduniellan | I044 | I01 | AR; | Psychomyidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Palaemonella burnsi | Anchialine pool shrimp | Shrimp, anchialine pool | K03A | I01 | HI; ; Currently in the state of Hawaii, there are estimated to be over 650 anchialine pools, approximately 90 percent of which occur on the island of Hawaii. Originally, only one pool located in the Park on the island of Hawaii was known to contain this species. During recent monitoring efforts by the State’s Division of Aquatic Resources (DAR), Palaemonella burnsi has been found in multiple pools within the Manuka NAR (T. Sakihara, DAR, in litt. 2010). On the island of Maui, this species is found at three sites in the State’s Ahihi-Kinau NAR (Brock 2004, pp. 30-57; Holthuis 1973, pp. 24-30; Maciolek, 1983, pp. 607-612). | Palaemonidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Palaemonetes antrorum | Texas cave shrimp | Shrimp, Texas cave | K01M | I01 | TX; | Palaemonidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Palaemonetes cummingi | Squirrel Chimney Cave shrimp | Shrimp, Squirrel Chimney Cave | K02F | I01 | FL; The Squirrel Chimney Cave Shrimp is only known from the Squirrel Chimney near Haile, Alachua County, Florida. This small, deep sinkhole that leads to a flooded cave system formed within the Crystal River Formation of the Ocala Group limestone. This formation underlies the Newberry Limestone Plain and is characteristic of karst topography. This relatively flat karst plain has numerous sinks and caves and connections between underground features do occur. Caves in this area support a variety of terrestrial and aquatic habitats. Several of the sink and cave systems within 5 miles are ecologically similar to Squirrel Chimney. There are similar assemblages of cavern dwelling species in these nearby underground sites, but no Squirrel Chimney Cave Shrimp have been documented.; U.S.A. (FL) | Palaemonidae | Jun 21, 1990 | Crustaceans | 4 | Threatened | 4 | US | I | Wherever found |
| Palaemonias alabamae | Alabama cave shrimp | Shrimp, Alabama cave | K01V | I01 | AL; U.S.A. (AL) | Atyidae | Sep 07, 1988 | Crustaceans | 4 | Endangered | 4 | US | I | Wherever found |
| Palaemonias ganteri | Kentucky cave shrimp | Shrimp, Kentucky cave | K01X | I01 | KY; U.S.A. (KY) | Atyidae | Oct 12, 1983 | Crustaceans | 4 | Endangered | 4 | US | I | Wherever found |
| Palafoxia arida gigantea | Giant spanishneedle | Spanishneedle, giant | Q1BB | P01 | AZ, CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Paleoxenus dohrni | Dohrn's elegant eucnemid beetle | Eucnemid beetle, Dohrn's elegant | I06V | I01 | CA; Possibly extinct,not reported since 1965 | Eucnemidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Palmeria dolei | crested honeycreeper (Akohekohe) | honeycreeper, (Akohekohe) crested | B00E | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Pan paniscus | Pygmy chimpanzee | Chimpanzee, pygmy | A06E | V01 | Congo (Zaire) | Pongidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pan troglodytes | Chimpanzee | Chimpanzee | A06C | V02 | Wherever found in captivity | Pongidae | Jun 16, 2015 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Panax quinquefolius | American ginseng | Ginseng, American | Q1BC | P01 | AL, AR, CT, DC, DE, FL, IA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, OK, PA, RI, SC, TN, VA, VT, WI, WV; | Araliaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4, 5, 6 | US | P | Wherever found |
| Pandion haliaetus | osprey | osprey | B0DZ | V01 | Pandionidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pangasianodon gigas | Thailand giant catfish | Catfish, Thailand giant | E00M | V01 | Thailand | Pangasiidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pangasius sanitwongsei | Catfish | Catfish | E00L | V01 | Thailand | Pangasiidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Panicum abscissum | Cutthroat grass | Grass, cutthroat | Q36N | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Panicum fauriei fauriei | Faurie's panic grass | Panic grass, Faurie's | Q1BF | P01 | HI; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Panicum fauriei var. carteri | Carter's panicgrass | Panicgrass, Carter's | Q1ZR | P01 | HI; U.S.A. (HI) | Poaceae | Oct 12, 1983 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Panicum niihauense | Lau `ehu | Lau `ehu | Q1BJ | P01 | HI; U.S.A. (HI) | Poaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Panicum philadelphicum | Philadelphia panic grass | Panic grass, Philadelphia | Q1BH | P01 | GA, SC; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Panicum sonoran | Sonoran panic grass | Panic grass, Sonoran | Q3IL | P01 | Poaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Panicum stevensianum | No common name | No common name | Q1BM | P01 | PR, VI; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Panoquina errans | Wandering skipper | Skipper, wandering | I014 | I01 | CA; | Hesperiidae | NA | Insects | 1 | Not Listed | 8 | US/Foreign | I | Wherever found |
| Panthalops hodgsonii | Tibetan antelope | antelope Tibetan | A0HJ | V01 | China, India, Nepal | Bovidae | Mar 29, 2006 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Panthera leo ssp. leo | Lion | Lion | A0JZ | V01 | Algeria, Benin, Burkina Faso, Cameroon, CAR, Chad, Congo, Cote d'Ivoire (Ivory Coast), DRC, Egypt, Gabon, Gambia, Ghana,Guinea, Guinea-Bissau, India, Liberia, Libya, Mali, Mauritania, Morocco, Niger, Nigeria, Senegal, Sierra Leone, Togo, Tunisia | Felidae | Jan 22, 2016 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Panthera leo ssp. melanochaita | Lion | Lion | A0KO | V01 | ; Angola, Botswana, Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Lesotho, Malawi, Mozambique, Rwanda, Somalia, South Africa, Sudan, South Sudan, Swaziland, Tanzania, Uganda, Zambia, Zimbabwe | Felidae | Jan 22, 2016 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Panthera onca | Jaguar | Jaguar | A040 | V01 | AZ, NM; Mexico,Central and South America | Felidae | Mar 28, 1972 | Mammals | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Panthera pardus | Leopard | Leopard | A01J | V01 | ; Africa,Asia | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found, except where it is listed as Threatened |
| Panthera pardus | Leopard | Leopard | A01J | V02 | ; Africa in wild south of,and including,Gabon,Congo,Zaire,Uganda,Kenya; In Africa, in wild, south of, and including, the following countries: Gabon,Congo,Zaire,Uganda,Kenya | Felidae | Jan 28, 1982 | Mammals | Foreign | Threatened | NA | Foreign | V | In Africa, in the wild, south of, and including, the following countries: Gabon, Congo, Zaire, Uganda, Kenya |
| Panthera tigris | Tiger | Tiger | A043 | V01 | Temperate and tropical Asia | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Papaipema aerata | [Unnamed] noctuid moth | Noctuid moth, [unnamed] | I0Q5 | I01 | DE, IL, MI, NH, NJ, NY, PA; Canada (Que.) | Noctuidae | NA | Insects | 5 | Not Listed | 3, 5 | US/Foreign | I | Wherever found |
| Papaipema aweme | [Unnamed] noctuid moth | Noctuid moth, [unnamed] | I0LK | I01 | MI, NY; Possibly extinct,not reported since 1965 | Noctuidae | NA | Insects | 3 | Not Listed | 3, 5 | US/Foreign | I | Wherever found |
| Papaipema eryngii | Rattlesnake-master borer moth | Moth, rattlesnake-master borer | I0LJ | I01 | AR, IL, KS, KY, NC, OK; ; The rattlesnake master borer moth is known to occur in one state in Region 3, Illinois. | Noctuidae | NA | Insects | 3 | Candidate | 2, 3, 4, 6 | US | I | Wherever found |
| Papaipema sp. | Flypoison borer moth | Moth, flypoison borer | I0NV | I01 | PA; | Noctuidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Papaipema sulphurata | Decodon borer moth | Moth, decodon borer | I0LG | I01 | MA; | Noctuidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Papasula (=Sula) abbotti | Abbott's booby | Booby, Abbott's | B04P | V01 | Sulidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Papaver alboroseum | Pale poppy | Poppy, pale | Q2EP | P01 | AK; Canada (B.C,Yukon),U.S.S.R | Papaveraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Papaver pygmaeum | No common name | No common name | Q3EW | P01 | MT; Canada (Alberta,B.C.) | Papaveraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US/Foreign | P | Wherever found |
| Papaver walpolei | Walpole poppy | Poppy, Walpole | Q1BN | P01 | AK; Canada (Yukon),U.S.S.R | Papaveraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Papilio benguetanus | Swallowtail butterfly | Butterfly, swallowtail | I0SR | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio carolinensis | Swallowtail butterfly | Butterfly, swallowtail | I0SP | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio chikae | Luzon peacock swallowtail butterfly | Butterfly, Luzon peacock swallowtail | I0ML | I01 | Philippines | Papilionidae | Jan 14, 1993 | Insects | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Papilio desmondi teita | Swallowtail butterfly | Butterfly, swallowtail | I0ST | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio esperanza | Esperanza swallowtail butterfly | Butterfly, Esperanza swallowtail | I0RO | I01 | Iridaceae | NA | Insects | 9 | Not Listed | NA | US | I | Wherever found | |
| Papilio himeros | Swallowtail butterfly | Butterfly, swallowtail | I0SM | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio homerus | Homerus swallowtail butterfly | Butterfly, Homerus swallowtail | I0MK | I01 | Jamaica | Papilionidae | Jan 14, 1993 | Insects | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Papilio hospiton | Corsican swallowtail butterfly | Butterfly, Corsican swallowtail | I0MJ | I01 | France (Corsica),Italy (Sardinia) | Papilionidae | Jan 14, 1993 | Insects | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Papilio leucotaenia | Swallowtail butterfly | Butterfly, swallowtail | I0SV | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio maraho | Swallowtail butterfly | Butterfly, swallowtail | I0SN | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio moerneri | Swallowtail butterfly | Butterfly, swallowtail | I0SQ | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio morondavana | Swallowtail butterfly | Butterfly, swallowtail | I0SU | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio neumoegeni | Swallowtail butterfly | Butterfly, swallowtail | I0SW | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio osmana | Swallowtail butterfly | Butterfly, swallowtail | I0SO | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papilio phorbanta | Swallowtail butterfly | Butterfly, swallowtail | I0SS | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Papustyla pulcherrima | Manus Island tree snail | Snail, Manus Island tree | G000 | I01 | Pacific Ocean-Admiralty Island (Manus Island); Papua New Guinea (Manus Island) | Camaenidae | Jun 02, 1970 | Snails | Foreign | Endangered | NA | Foreign | I | Wherever found |
| parabuteo unicinctus | Harris's Hawk | Hawk, Harris's | B0ED | V01 | accipitridae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Paracoenia calida | Wilbur Springs shore fly | Shore fly, Wilbur Springs | I0DO | I01 | CA; | Ephydridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Paracymus seclusus | Seclusive water scavenger beetle | Beetle, seclusive water scavenger | I02E | I01 | MS; | Hydrophilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Parahyaena (=Hyaena) brunnea | Brown Hyena | Hyena, brown | A01B | V01 | Wherever found | Hyaenidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Paraleptophlebia calcarica | [Unnamed] mayfly | Mayfly, [unnamed] | I0O1 | I01 | AR; | Leptophlebiidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Parapsyche extensa | King's Creek parapsyche caddisfly | Caddisfly, King's Creek parapsyche | I03Y | I01 | CA; Possibly extinct,not reported since 1965 | Hydropsychidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Pararhinichthys bowersi | Cheat minnow | Minnow, cheat | E03U | V01 | MD, PA, WV; | Cyprinidae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Paravitrea aulacogyra | [Unnamed] snail | Snail, [unnamed] | G08T | I01 | AR; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Paravitrea ceres | Sidelong supercoil | Supercoil, sidelong | G05H | I01 | WV; | Zonitidae | NA | Snails | 5 | Not Listed | 5 | US | I | Wherever found |
| Paravitrea clappi | Mirey Ridge supercoil snail | Snail, Mirey Ridge supercoil | G03I | I01 | NC, TN; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Paravitrea ternaria | Sculpted supercoil | Supercoil, sculpted | G08U | I01 | NC; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Paravitrea varidens | Roan supercoil | Supercoil, Roan | G08V | I01 | NC, TN; | Zonitidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pardofelis (=Felis) marmorata | Marbled cat | Cat, marbled | A04Z | V01 | Entire; Nepal,Southeast Asia,Indonesia | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Parides ascanius | Fluminense swallowtail butterfly | Butterfly, Fluminense swallowtail | I0RP | I01 | Papilionidae | NA | Insects | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Parides burchellanus | Swallowtail butterfly | Butterfly, swallowtail | I0SH | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Parides hahneli | Hahnel's Amazonian swallowtail butterfly | Butterfly, Hahnel's Amazonian swallowtail | I0RQ | I01 | Papilionidae | NA | Insects | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Parides jophon | Swallowtail butterfly | Butterfly, swallowtail | I0SI | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Parides schadenberqi | Swallowtail butterfly | Butterfly, swallowtail | I0SJ | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Parnassia caroliniana | Carolina grass-of-parnassus | Grass-of-parnassus, Carolina | Q2EQ | P01 | FL; | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Parnassia grandifolia | Largeleaf grass of Parnassus | grass of Parnassus, Largeleaf | Q3KS | P01 | NC; | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Parnassia kotzebuei pumila | Kotzebue's, grass-of-parnassus | Grass-of-parnassus, Kotzebue's, | Q1BO | P01 | WA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Parnassius clodius strohbeeni | Strohbeen's parnassian | Parnassian, Strohbeen's | I00X | I01 | CA; Believed to be extinct | Papilionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Paronychia ahartii | Ahart's whitlow-wort | Whitlow-wort, Ahart's | Q36O | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Paronychia argyrocoma | Silverling | Silverling | Q1BP | P01 | MA, ME, NH; | Caryophyllaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Paronychia chartacea | Papery whitlow-wort | Whitlow-wort, papery | Q1ZV | P01 | FL; U.S.A. (FL) | Caryophyllaceae | Jan 21, 1987 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Paronychia congesta | Bushy whitlow-wort | Whitlow-wort, bushy | Q1BR | P01 | Caryophyllaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Paronychia drummondii parviflora | No common name | No common name | Q1BS | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia lindheimeri var. lindheimeri | Lindheimer's nailwort | Nailwort, Lindheimer's | Q1BQ | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia maccartii | McCart's whitlow-wort | Whitlow-wort, McCart's | Q1BT | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia monticola | Livermore nailwort | Nailwort, Livermore | Q1BV | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia monticola | No common name | No common name | Q1BU | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia rugelii interior | [Unnamed] whitlow-wort | Whitlow-wort, [unnamed] | Q1BW | P01 | FL, GA; | Caryophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Paronychia virginica parksii | No common name | No common name | Q1BX | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Paronychia virginica var. virginica | Silvery nailwort | Nailwort, silvery | Q2Q8 | P01 | DC, MD, VA, WV; | Caryophyllaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Paronychia wilkinsonii | Wilkinson's whitlow-wort | Whitlow-wort, Wilkinson's | Q1BY | P01 | TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Paroreomyza flammea | Molokai creeper | Creeper, Molokai | B04H | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Paroreomyza maculata | Oahu creeper | Creeper, Oahu | B046 | V01 | HI; U.S.A. (HI) | Drepanidinae | Oct 13, 1970 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Parrya nudicaulis | No common name | No common name | Q2ER | P01 | AK, MT; Canada,U.S.S.R | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6, 7 | US | P | Wherever found |
| Parrya rydbergii | Rydberg parrya | Parrya, Rydberg | Q2V3 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Parthenium alpinum | No common name | No common name | Q1BZ | P01 | CO, WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Parthenium integrifolium | Wavyleaf wild-quinine | Wild-quinine, wavyleaf | Q36P | P01 | NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Parthenium ligulatum | [Unnamed] feverfew | Feverfew, [unnamed] | Q1C0 | P01 | CO, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Parthenium tetraneuris | Arkansas River feverfew | Feverfew, Arkansas River | Q1C1 | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Partula gibba | Humped tree snail | Snail, Humped tree | G0AC | I01 | GU; | Partulidae | Nov 02, 2015 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Partula langfordi | Langford's tree snail | Snail, Langford's tree | G0AI | I01 | MP; | Partulidae | Nov 02, 2015 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Partula radiolata | Guam tree snail | Snail, Guam tree | G0A8 | I01 | GU; | Partulidae | Nov 02, 2015 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Partula salifana | Alifan Tree snail | Snail, Alifan Tree | G0A6 | I01 | GU; Possibly extinct | Partulidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina anceyana | Maui tree snail | Snail, Maui tree | G0AJ | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina carnicolor | Maui tree snail | Snail, Maui tree | G0AK | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina confusa | Hawai`i tree snail | Snail, Hawai`i tree | G0A9 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina crassa | Lanai tree snail | Snail, Lanai tree | G0AD | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina crocea | Maui tree snail | Snail, Maui tree | G0AL | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina dolei | Maui tree snail | Snail, Maui tree | G0AM | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina dubia | Waianae tree snail | Snail, Waianae tree | G0BK | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina dwightii | Moloka`i tree snail | Snail, Moloka`i tree | G0B8 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina fusoidea | Maui tree snail | Snail, Maui tree | G0AN | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina germana | Maui tree snail | Snail, Maui tree | G0AO | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina gouldii | Maui tree snail | Snail, Maui tree | G0AP | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina grisea | Maui tree snail | Snail, Maui tree | G0AQ | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina horneri | Hawai`i tree snail | Snail, Hawai`i tree | G0AA | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina induta | Maui tree snail | Snail, Maui tree | G0AR | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina kaaeana | Maui tree snail | Snail, Maui tree | G0AS | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina lemmoni | Maui tree snail | Snail, Maui tree | G0AT | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina marmorata | Maui tree snail | Snail, Maui tree | G0AU | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina mighelsiana | Moloka`i tree snail | Snail, Moloka`i tree | G0B9 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina mucida | Moloka`i tree snail | Snail, Moloka`i tree | G0BA | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina mutabilis | Maui tree snail | Snail, Maui tree | G0AV | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina natti | Maui tree snail | Snail, Maui tree | G0AW | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina nivea | Maui tree snail | Snail, Maui tree | G0AX | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina perdix | Maui tree snail | Snail, Maui tree | G0AY | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina physa | Hawai`i tree snail | Snail, Hawai`i tree | G0AB | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina plumbea | Maui tree snail | Snail, Maui tree | G0AZ | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina porcellana | Maui tree snail | Snail, Maui tree | G0B0 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina proxima | Moloka`i tree snail | Snail, Moloka`i tree | G0BB | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina radiata | Maui tree snail | Snail, Maui tree | G0B1 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina redfieldii | Moloka`i tree snail | Snail, Moloka`i tree | G0BC | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina rufa | Moloka`i tree snail | Snail, Moloka`i tree | G0BD | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina semicarinata | Lanai tree snail | Snail, Lanai tree | G0AG | I01 | HI; | Achatinellidae | Jun 27, 2013 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Partulina splendida | Maui tree snail | Snail, Maui tree | G0B2 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina subpolita | Moloka`i tree snail | Snail, Moloka`i tree | G0BE | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina tapaniana | Maui tree snail | Snail, Maui tree | G0B3 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina terebra | Maui tree snail | Snail, Maui tree | G0B4 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina tessellata | Moloka`i tree snail | Snail, Moloka`i tree | G0BF | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina thaanumiana | Maui tree snail | Snail, Maui tree | G0B5 | I01 | Achatinellidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Partulina theodorei | Moloka`i tree snail | Snail, Moloka`i tree | G0BG | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina ustulata | Maui tree snail | Snail, Maui tree | G0B6 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina variabilis | Lanai tree snail | Snail, Lanai tree | G0AH | I01 | HI; | Achatinellidae | Jun 27, 2013 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Partulina virgulata | Moloka`i tree snail | Tree snail, Moloka`i | G097 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Partulina winniei | Maui tree snail | Snail, Maui tree | G0B7 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Parula pitiayumi nigrilora | Tropical parula | Parula, tropical | B08M | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Parvisedum leiocarpum | Lake County stonecrop | Stonecrop, Lake County | Q1C2 | P01 | CA; U.S.A. (CA) | Crassulaceae | Jun 18, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Passerculus sandwichensis beldingi | Belding's savannah sparrow | Sparrow, Belding's savannah | B088 | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Passerculus sandwichensis rostratus | Large-billed savannah sparrow | Sparrow, large-billed savannah | B07H | V01 | AZ, CA; | Emberizidae | NA | Birds | 1 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Passerina caerulea | Blue Grosbeak | Grosbeak,Blue | B0ES | V01 | Cardinalidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Passerina ciris ciris | Eastern painted bunting | Bunting, eastern painted | B0AG | V01 | FL, GA, NC, SC; West Indies | Emberizidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Passiflora berteroana | No common name | No common name | Q3EX | P01 | PR, VI; | Passifloraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Passiflora bilobata | No common name | No common name | Q2V4 | P01 | PR, VI; | Passifloraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Passiflora murucuja | No common name | No common name | Q2ES | P01 | PR, VI; | Passifloraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| patagioenas fasciata | Band-tailed pigeon | pigeon, Band-tailed | B0DX | V01 | columbidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Patagioenas leucocephala | White-crowned pigeon | Pigeon, white-crowned | B076 | V01 | FL; West Indies,Central America | Columbidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Patera clenchi | Calico Rock oval | Oval, Calico Rock | G01N | I01 | AR; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pauroctonus maritimus | Monterey Dunes scorpion | Scorpion, Monterey Dunes | J013 | I01 | CA; | Vejovidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Paurotriozana adaptata | Oahu holio gall psyllid | Psyllid, Oahu holio gall | I0QN | I01 | HI; | Psyllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Pauxi unicornis | Southern-helmeted curassow | Curassow, Southern-helmeted | B0BY | V01 | Cracidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pavona diffluens | No common name | No common name | P01Q | I01 | Agariciidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Paxistima canbyi | No common name | No common name | Q2V5 | P01 | NC, VA; | Celastraceae | NA | Flowering Plants | 3 | Not Listed | 4, 5 | US | P | Wherever found |
| Paysonia stonensis | Stones River bladderpod | Bladderpod, Stones River | Q13K | P01 | TN; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pecosorbis kansasensis | New Mexico Ramshorn snail | Snail, New Mexico Ramshorn | G048 | I01 | NM, TX; | Planorbidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pectis imberbis | Beardless chinch weed | Chinch weed, beardless | Q2Q9 | P01 | AZ; U.S.A. (AZ), Mexico | Asteraceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | P | Wherever found |
| Pectis rusbyi | Rusby's fetid-marigold | Fetid-marigold, Rusby's | Q1C3 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Pedicularis dudleyi | Dudley's lousewort | Lousewort, Dudley's | Q1C4 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pedicularis furbishiae | Furbish lousewort | Lousewort, Furbish | Q1ZW | P01 | ME; Canada (N.B.); The species is found in the St. John River in Aroostook County, Maine and in New Brunswick, Canada.; U.S.A. (ME), Canada (N.B.) | Scrophulariaceae | May 27, 1978 | Flowering Plants | 5 | Endangered | 5 | US/Foreign | P | Wherever found |
| Pedicularis howellii | Howell's lousewort | Lousewort, Howell's | Q1C5 | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Pedicularis rainierensis | No common name | No common name | Q1C6 | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pedicularis semibarbata charlestonensis | No common name | No common name | Q3EY | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pediocactus (=Echinocactus,=Utahia) sileri | Siler pincushion cactus | Cactus, Siler pincushion | Q200 | P01 | AZ, UT; U.S.A. (UT, AZ) | Cactaceae | Nov 26, 1979 | Flowering Plants | 2 | Threatened | 2, 6 | US | P | Wherever found |
| Pediocactus bradyi | Brady pincushion cactus | Cactus, Brady pincushion | Q1ZX | P01 | AZ; U.S.A. (AZ) | Cactaceae | Nov 26, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Pediocactus despainii | San Rafael cactus | Cactus, San Rafael | Q2QA | P01 | UT; U.S.A. (UT) | Cactaceae | Sep 16, 1987 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Pediocactus knowltonii | Knowlton's cactus | Cactus, Knowlton's | Q1ZY | P01 | CO, NM; U.S.A. (NM, CO) | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Endangered | 2, 6 | US | P | Wherever found |
| Pediocactus paradinei | Kaibab plains cactus | Cactus, Kaibab plains | Q1C8 | P01 | AZ; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Pediocactus peeblesianus fickeiseniae | Fickeisen plains cactus | Cactus, Fickeisen plains | Q1C9 | P01 | AZ; | Cactaceae | Oct 31, 2013 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Pediocactus peeblesianus var. peeblesianus | Peebles Navajo cactus | Cactus, Peebles Navajo | Q1ZZ | P01 | AZ; U.S.A. (AZ) | Cactaceae | Nov 28, 1979 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Pediocactus winkleri | Winkler cactus | Cactus, Winkler | Q2QB | P01 | UT; U.S.A. (UT) | Cactaceae | Aug 20, 1998 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Pediomelum aromaticum tuhyi | No common name | No common name | Q3EZ | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Pediomelum castoreum | [Unnamed] scurf-pea | Scurf-pea, [unnamed] | Q3F0 | P01 | AZ, CA, NV, UT; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Pediomelum epipsilum | [Unnamed] scurf-pea | Scurf-pea, [unnamed] | Q3F1 | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Pediomelum humile | Rydberg's scurf-pea | Scurf-pea, Rydberg's | Q36Q | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Pediomelum pariensis | No common name | No common name | Q1CA | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Pediomelum pentaphyllum | Chihuahua scurfpea | scurfpea, Chihuahua | Q3F2 | P01 | AZ, NM; | Fabaceae | May 04, 2019 | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Pediomelum subacaule | Whiterim scurf-pea | Scurf-pea, Whiterim | Q1K7 | P01 | AL, GA, TN; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pedionomus torquatus | Plains wanderer (=collared-hemipode) | wanderer, Plains (=collared-hemipode) | B04L | V01 | Australia | Pedionomidae | Jun 04, 1973 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pegias fabula | Littlewing pearlymussel | Pearlymussel, littlewing | F00L | I01 | AL, KY, NC, TN, VA; U.S.A. (VA, TN, NC, KY, AL) | Unionidae | Nov 14, 1988 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Pekania pennanti | Fisher | Fisher | A0HS | V01 | CA, OR, WA; | Mustelidae | NA | Mammals | 8 | Proposed Threatened | 1, 8 | US | V | West coast DPS |
| Pekania pennanti | Fisher | Fisher | A0HS | V03 | ID, MT, WY; | Mustelidae | NA | Mammals | 6 | Not Listed | 1, 6 | US | V | Northern Rocky Mountains DPS |
| Pelea anisata haupuana | No common name | No common name | Q1CB | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea clusiaefolia pickeringii | No common name | No common name | Q1CC | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea elliptica mauiensis | No common name | No common name | Q2ET | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea grandifolia lianoides | No common name | No common name | Q1CD | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea grandifolia montana | No common name | No common name | Q1CE | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea grandifolia ovalifolia | No common name | No common name | Q1CF | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea parvifolia apoda | Apoda | Apoda | Q1CM | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea parvifolia sessilis | No common name | No common name | Q1CN | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea peduncularis cordata | No common name | No common name | Q1CO | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea peduncularis niuensis | No common name | No common name | Q1CP | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea peduncularis nummularia | No common name | No common name | Q1CQ | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pelea volcanica kohalae | No common name | No common name | Q1CR | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| pelecanus erythrorhynchos | American white pelican | pelican, American white | B0EC | V01 | pelecanidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Pelecanus occidentalis | Brown pelican | Pelican, brown | B02L | V01 | AZ, CA, LA, TX, WA; Central and South America | Pelicanidae | Jun 02, 1970 | Birds | 8 | Recovery | 1, 2, 4, 8 | US/Foreign | V | Wherever found, except U.S. Atlantic coast, FL, AL |
| Pelecanus occidentalis | Brown pelican | Pelican, brown | B02L | V02 | AL, FL, GA, MD, NC, SC, VA; | Pelicanidae | Jun 02, 1970 | Birds | 4 | Recovery | 4, 5 | US/Foreign | V | U.S. Atlantic coast, FL, AL |
| pelecanus occidentalis ssp. occidentalis | Brown pelican | pelican, Brown | B0F8 | V01 | pelecanidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pelocoris shoshone amargosa | Amargosa naucorid | Naucorid, Amargosa | I0BH | I01 | CA, NV; | Naucoridae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Peltophryne lemur | Puerto Rican crested toad | Toad, Puerto Rican crested | D00M | V01 | PR; Puerto Rico and Virgin Gorda; The Puerto Rican crested toad is now exclusively found in (endemic to ) Puerto Rico since the species has been never collected from US Virgin Islands and is considered extirpated from the British Virgin Islands. | Bufonidae | Aug 04, 1987 | Amphibians | 4 | Threatened | 4 | US/Foreign | V | Wherever found |
| Peltotrupes youngi | Ocala burrowing scarab | Scarab, Ocala burrowing | I0D6 | I01 | FL; | Geotrupidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Penelope albipennis | White-winged guan | Guan, white-winged | B06A | V01 | Peru | Cracidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Penelope perspicax | Cauca guan | Guan, Cauca | B0CL | V01 | Colombia | Cracidae | Nov 29, 2013 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Peniocereus greggii greggii | Desert night-blooming cereus | Night-blooming cereus, desert | Q0DT | P01 | NM, TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Peniocereus greggii transmontanus | No common name | No common name | Q0DU | P01 | AZ, CA, NM, TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Penstemon abietinus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1CU | P01 | NV, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Penstemon absarokensis | Absaroka beardtongue | Beardtongue, Absaroka | Q2V6 | P01 | WY; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon acaulis | Stemless beardtongue | Beardtongue, stemless | Q1CV | P01 | UT, WY; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon alamosensis | Alamo beardtongue | Beardtongue, Alamo | Q1CW | P01 | NM, TX; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon albomarginatus | White-margined penstemon | Penstemon, white-margined | Q36T | P01 | AZ, CA, NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Penstemon ammophilum | No common name | No common name | Q2QC | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon angustifolius dulcis | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q36U | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon angustifolius vernalensis | No common name | No common name | Q2EU | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon arenarius | No common name | No common name | Q1CX | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon arkansanus | No common name | No common name | Q2EZ | P01 | AR; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Penstemon atwoodii | No common name | No common name | Q1CY | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon baccharifolius | No common name | No common name | Q2EV | P01 | TX; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon barrettiae | No common name | No common name | Q1CZ | P01 | OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon bicolor bicolor | No common name | No common name | Q1D0 | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon bicolor roseus | No common name | No common name | Q1D1 | P01 | AZ, NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Penstemon bracteatus | Red Canyon beardtongue | Beardtongue, Red Canyon | Q2V7 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon caespitosus suffruticosus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1D2 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon calcareus | Limestone penstemon | Penstemon, limestone | Q1D3 | P01 | CA, NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon californicus | California penstemon | Penstemon, California | Q1D4 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon caryi | Cary beardtongue | Beardtongue, Cary | Q1D5 | P01 | MT, WY; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon cinicola | Ash penstemon | Penstemon, ash | Q1D6 | P01 | CA, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Penstemon clutei | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1D7 | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon cobaea purpureus | No common name | No common name | Q1D8 | P01 | AR, MO, OK; | Scrophulariaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Penstemon compactus | Cache beardtongue | Beardtongue, cache | Q1D9 | P01 | ID, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 1, 6 | US | P | Wherever found |
| Penstemon concinnus | Tunnel Springs beardtongue | Beardtongue, Tunnel Springs | Q1DA | P01 | NV, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Penstemon crandallii atractus | No common name | No common name | Q3F3 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon deamii | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q36V | P01 | IN; | Scrophulariaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Penstemon debilis | Parachute beardtongue | beardtongue, Parachute | Q36W | P01 | CO; U.S.A. (CO) | Plantaginaceae | Aug 26, 2011 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Penstemon degeneri | Degener beardtongue | Beardtongue, Degener | Q1DC | P01 | CO; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon discolor | Cataiina beardtongue | Beardtongue, Cataiina | Q1DD | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon dissectus | No common name | No common name | Q1DE | P01 | GA; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Penstemon distans | Mt. Trumbull beardtongue | Beardtongue, Mt. Trumbull | Q2QD | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon elegantulus | No common name | No common name | Q1DF | P01 | ID, OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon filiformis | Thread-leaved penstemon | Penstemon, thread-leaved | Q1DG | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon floribundus | No common name | No common name | Q36X | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon flowersii | No common name | No common name | Q2V8 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon francisci-pennellii | No common name | No common name | Q2EW | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon franklinii | Ben Franklin's Beardtongue | Beardtongue Ben Franklin's | Q3MB | P01 | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Penstemon fruticiformis amargosae | Amargosa penstemon | Penstemon, Amargosa | Q2QE | P01 | CA, NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon gibbensii | Gibbens beardtongue | Beardtongue, Gibbens | Q2QF | P01 | CO, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon glaucinus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1DH | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon goodrichii | No common name | No common name | Q2V9 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon grahamii | Graham beardtongue | Beardtongue, Graham | Q1DI | P01 | CO, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon harringtonii | Harrington beardtongue | Beardtongue, Harrington | Q2VA | P01 | CO; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon haydenii | Blowout penstemon | Penstemon, blowout | Q2EX | P01 | NE, WY; U.S.A. (NE) | Scrophulariaceae | Sep 01, 1987 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Penstemon humilis brevifolius | No common name | No common name | Q1DJ | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon humilis obtusifolius | No common name | No common name | Q1DK | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon humilis var. humilis | Low beardtongue | Beardtongue, Low | Q1DB | P01 | NV, UT; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Penstemon idahoensis | Idaho penstemon | Penstemon, Idaho | Q36Y | P01 | ID, UT; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Penstemon kingii | King's beardtongue | Beardtongue, King's | Q1DP | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon leiophyllus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1DM | P01 | NV, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| penstemon leiophyllus var. keckii | Charleston beardtongue | beardtongue, Charleston | Q3JI | P01 | scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Penstemon leiophyllus var. keckii | Keck's beardtongue | Beardtongue, Keck's | Q1DL | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon lemhiensis | Lemhi beardtongue | Beardtongue, Lemhi | Q1DN | P01 | ID, MT; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Penstemon leptanthus | No common name | No common name | Q2QG | P01 | UT; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon mensarum | Tiger beardtongue | Beardtongue, tiger | Q36Z | P01 | CO; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon moriahensis | No common name | No common name | Q2EY | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon nanus | Low beardtongue | Beardtongue, Low | Q1DO | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon navajoa | No common name | No common name | Q2VB | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon pahutensis | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1DQ | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon papillatus | Inyo penstemon | Penstemon, Inyo | Q1DR | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon parviflorus | No common name | No common name | Q2QH | P01 | CO; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon parvus | Small beardtongue | Beardtongue, small | Q1DS | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon patricus | No common name | No common name | Q2F0 | P01 | NV, UT; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Penstemon paysoniorum | Payson beardtongue | Beardtongue, Payson | Q2F1 | P01 | WY; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon peckii | No common name | No common name | Q1DT | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon penlandii | Penland beardtongue | Beardtongue, Penland | Q2YC | P01 | CO; U.S.A. (CO) | Scrophulariaceae | Jul 13, 1989 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Penstemon personatus | Closed-lip beardtongue | Beardtongue, closed-lip | Q1DU | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon pinorum | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q370 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon procerus modestus | No common name | No common name | Q1DV | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon pudicus | No common name | No common name | Q1DW | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon retrorsus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1DX | P01 | CO; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon rubicundus | [Unnamed] beardtongue | Beardtongue, [unnamed] | Q1DY | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon scariosus albifluvis | White River beardtongue | Beardtongue, White River | Q2QI | P01 | CO, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon scariosus garrettii | Garrett's beardtongue | Beardtongue, Garrett's | Q1DZ | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon spatulatus | Wallowa beardtongue | Beardtongue, Wallowa | Q1E0 | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon stephensii | Stephens' beardtongue | Beardtongue, Stephens' | Q1E1 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon thompsoniae jaegeri | No common name | No common name | Q1E2 | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon thurberi anestius | No common name | No common name | Q1E3 | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon tidestromii | Tidestrom beardtongue | Beardtongue, Tidestrom | Q2QJ | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon tracyi | Tracy beardtongue | Beardtongue, Tracy | Q1E4 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Penstemon uintahensis | Uintah beardtongue | Beardtongue, Uintah | Q1E5 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon virgatus pseudoputus | No common name | No common name | Q1E6 | P01 | AZ; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Penstemon wardii | Ward beardtongue | Beardtongue, Ward | Q1E7 | P01 | UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Penstemon washingtonensis | No common name | No common name | Q1E8 | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Penstemon yampaensis | No common name | No common name | Q2F2 | P01 | CO, UT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Pentachaeta bellidiflora | White-rayed pentachaeta | Pentachaeta, white-rayed | Q2F3 | P01 | CA; U.S.A. (CA) | Asteraceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Pentachaeta exilis aeolica | Slender pentachaeta | Pentachaeta, slender | Q1E9 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pentachaeta lyonii | Lyon's pentachaeta | Pentachaeta, Lyon's | Q1EA | P01 | CA; U.S.A. (CA) | Asteraceae | Jan 29, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Pentagenia robusta | Robust pentagenian burrowing mayfly | Mayfly, robust pentagenian burrowing | I09Y | I01 | OH; Believed to be extinct | Ephemeridae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Pentalagus furnessi | Ryukyu rabbit | Rabbit, Ryukyu | A07R | V01 | Japan (Ryukyu Islands) | Leporidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Japan (Ryukyu Islands) |
| Pentarthrum blackburni | Blackburn's pentarthrum weevil | Weevil, Blackburn's pentarthrum | I0FF | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Pentarthrum obscura | Obscure pentarthrum weevil | Weevil, obscure pentarthrum | I0G8 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Peperomia cookiana minutilimba | No common name | No common name | Q1EB | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia degeneri | No common name | No common name | Q1ED | P01 | HI; Possibly extinct | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia eekana | Mt. Eke peperomia | Peperomia, Mt. Eke | Q1EQ | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia eekana | Mt. Eke peperomia | Peperomia, Mt. Eke | Q1EP | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia expallescens brevipilosa | No common name | No common name | Q1EE | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia fauriei | No common name | No common name | Q1EF | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia helleri knudsenii | No common name | No common name | Q1EI | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia lilifolia obtusata | No common name | No common name | Q1EJ | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia macraeana | Pinninerve peperomia | Peperomia, Pinninerve | Q1EK | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia megalopoda | No common name | No common name | Q371 | P01 | PR, VI; Possibly extinct,not observed since 1929. | Piperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Peperomia membranacea | No common name | No common name | Q2F5 | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia membranacea | Woodland peperomia | Peperomia, Woodland | Q1EG | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia myrtifolia | No common name | No common name | Q372 | P01 | PR, VI; British Virgin Islands,Lesser Antilles | Piperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Peperomia oahuensis st-johnii | No common name | No common name | Q1EL | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia obovatilimba | Graceful peperomia | Peperomia, Graceful | Q1EC | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia obtusifolia | No common name | No common name | Q2F4 | P01 | FL; | Piperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Peperomia remyi | Valley peperomia | Peperomia, Valley | Q1EH | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia rigidilimba | No common name | No common name | Q1EN | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia rockii | No common name | No common name | Q373 | P01 | HI; | Piperaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peperomia subpetiolata | `Ala `ala wai nui | `Ala `ala wai nui | Q201 | P01 | HI; | Piperaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Peperomia wheeleri | Wheeler's peperomia | Peperomia, Wheeler's | Q2F6 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR), Britsh Virgin Island and Dutch West Indies | Piperaceae | Jan 14, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Perameles bougainville | Barred bandicoot | Bandicoot, barred | A02Y | V01 | Entire | Peramelidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Perameles eremiana | Desert bandicoot | Bandicoot, desert | A045 | V01 | Entire | Peramelidae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Percina antesella | Amber darter | Darter, amber | E05F | V01 | GA, TN; U.S.A. (TN, GA, AL) | Percidae | Aug 05, 1985 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Percina aurolineata | Goldline darter | Darter, goldline | E05S | V01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Percidae | Apr 22, 1992 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Percina aurora | Pearl darter | Darter, Pearl | E07A | V01 | MS; | Percidae | Oct 20, 2017 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Percina bimaculata | Chesapeake logperch | logperch, Chesapeake | E0CU | V01 | DC, MD, PA, VA; | Percidae | NA | Fishes | 5 | Under Review in the Candidate or Petition Process | 5 | US | V | Wherever found |
| Percina brevicauda | Coal darter | darter, Coal | E0D0 | V01 | AL; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Percina burtoni | Blotchside Logperch | Logperch, Blotchside | E0AY | V01 | NC; | Percidae | NA | Fishes | 5 | Not Listed | 4 | US | V | Wherever found |
| Percina crypta | Halloween darter | Darter, Halloween | E079 | V01 | AL, GA; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Halloween |
| Percina cymatotaenia | Bluestripe darter | Darter, bluestripe | E03I | V01 | MO; | Percidae | NA | Fishes | 3 | Under Review in the Candidate or Petition Process | 3 | US | V | Wherever found |
| Percina jenkinsi | Conasauga logperch | Logperch, Conasauga | E05H | V01 | GA, TN; U.S.A. (TN, GA) | Percidae | Aug 05, 1985 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Percina kusha | Bridled darter | darter, Bridled | E0CV | V01 | GA, TN; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Percina lenticula | Freckled darter | Darter, freckled | E016 | V01 | AL, GA, LA, MS; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Percina macrocephala | Longhead darter | Darter, longhead | E018 | V01 | KY, NY, OH, PA, TN, WV; Longhead darter | Percidae | NA | Fishes | 5 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US | V | Wherever found |
| Percina nasuta | Longnose darter | Darter, longnose | E03M | V01 | AR, MO, OK; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 2, 3, 4 | US | V | Wherever found |
| Percina palmaris | Bronze darter | Darter, bronze | E077 | V01 | AL, GA, TN; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Percina pantherina | Leopard darter | Darter, leopard | E017 | V01 | AR, OK; U.S.A. (OK, AR) | Percidae | Feb 27, 1978 | Fishes | 2 | Threatened | 2, 4 | US | V | Wherever found |
| Percina rex | Roanoke logperch | Logperch, Roanoke | E01G | V01 | NC, VA; ; U.S.A. (VA) | Percidae | Aug 18, 1989 | Fishes | 5 | Endangered | 4, 5 | US | V | Wherever found |
| Percina sipsi | Bankhead darter | darter, Bankhead | E0CW | V01 | AL; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Percina sp. | Warrior bridled darter | Darter, Warrior bridled | E07C | V01 | AL; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Warrior bridled |
| Percina sp. | Alabama channel darter | Darter, Alabama channel | E075 | V01 | AL; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | AL channel |
| Percina squamata | Olive darter | Darter, olive | E06I | V01 | NC; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Percina tanasi | Snail darter | Darter, snail | E010 | V01 | AL, GA, MS, TN; U.S.A. (TN, GA, AL) | Percidae | Nov 10, 1975 | Fishes | 4 | Threatened | 4 | US | V | Wherever found |
| Percina uranidea | Stargazing darter | Darter, stargazing | E05U | V01 | AR, IL, IN, LA, MO; | Percidae | NA | Fishes | 4 | Not Listed | 3, 4 | US | V | Wherever found |
| Percina williamsi | Sickle darter | darter, Sickle | E0CX | V01 | NC, TN, VA; | Percidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | V | Wherever found |
| Perdicella carinella | [Unnamed] snail | Snail, [unnamed] | G04M | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella fulgurans | [Unnamed] snail | Snail, [unnamed] | G04N | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella helena | [Unnamed] snail | Snail, [unnamed] | G0A0 | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella kuhnsi | [Unnamed] snail | Snail, [unnamed] | G04O | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella mauiensis | [Unnamed] snail | Snail, [unnamed] | G04P | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella ornata | [Unnamed] snail | Snail, [unnamed] | G04Q | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella thwingii | [Unnamed] snail | Snail, [unnamed] | G04R | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella zebra | [Unnamed] snail | Snail, [unnamed] | G04S | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdicella zebrina | [Unnamed] snail | Snail, [unnamed] | G04T | I01 | HI; | Achatinellidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Perdita algondones | Andrenid Bee | Bee, Andrenid | I0TJ | I01 | Andrenidae | NA | Insects | 1 | Not Listed | NA | US | I | Wherever found | |
| Perdita glamis | Andrenid bee | Bee, Andrenid | I0TK | I01 | Andrenidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Perdita hirticeps luteocincta | Yellow-banded andrenid bee | Andrenid bee, yellow-banded | I01T | I01 | CA; Possibly extinct,not reported since 1965 | Andrenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Perdita meconis | Mojave poppy bee | bee, Mojave poppy | I0YZ | I01 | Andrenidae | NA | Insects | 8 | Not Listed | NA | US | I | Entire | |
| Perdita scitula antiochensis | Antioch andrenid bee | Andrenid bee, Antioch | I01S | I01 | CA; | Andrenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Perdix perdix italica | Italian grey Partridge | Partridge, Italian grey | B0CO | V01 | Phasianidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Perideridia bacigalupii | Mother Lode yampah | Yampah, Mother Lode | Q1ER | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perideridia erythrorhiza | Red-root yampah | Yampah, red-root | Q1ES | P01 | OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Perideridia gairdneri gairdneri | Gairdner's yampah | Yampah, Gairdner's | Q1ET | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perideridia leptocarpa | Narrow-seeded yampah | Yampah, narrow-seeded | Q1EU | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perideridia pringlei | Adobe yampah | Yampah, adobe | Q1EV | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perimyotis subflavus | Tricolored bat | Bat, Tricolored | A0L8 | V01 | AL, AR, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, NE, NH, NJ, NY, OH, OK, PA, RI, SC, TN, TX, VA, VT, WI, WV; | Vespertilionidae | NA | Mammals | 5 | Under Review in the Candidate or Petition Process | 2, 3, 4, 5, 6 | US/Foreign | V | Wherever found |
| Perityle ajoensis | Ajo rock-daisy | Rock-daisy, Ajo | Q2F7 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle bisetosa bisetosa | Two-bristle rock-daisy | Rock-daisy, two-bristle | Q1EW | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Perityle bisetosa scalaris | Stairstep two-bristle rock-daisy | Rock-daisy, stairstep two-bristle | Q1EX | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle cernua | Nodding rock-daisy | Rock-daisy, nodding | Q1EY | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle cinerea | Gray rock-daisy | Rock-daisy, gray | Q1EZ | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle cochisensis | Chiricahua rock-daisy | Rock-daisy, Chiricahua | Q1F0 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle gilensis salensis | [Unnamed] rock-daisy | Rock-daisy, [unnamed] | Q1F1 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle huecoensis | Hueco rock-daisy | Rock-daisy, Hueco | Q374 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle inyoensis | Inyo laphamia | Laphamia, Inyo | Q1F2 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perityle lemmonii | No common name | No common name | Q1F3 | P01 | AZ, NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle lindheimeri halimifolia | [Unnamed] rock-daisy | Rock-daisy, [unnamed] | Q1F4 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle lindheimeri lindheimeri | [Unnamed] rock-daisy | Rock-daisy, [unnamed] | Q1F5 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle megalocephala intricata | No common name | No common name | Q1F6 | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perityle parryi | No common name | No common name | Q2F8 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle saxicola | Fish Creek rock-daisy | Rock-daisy, Fish Creek | Q1F7 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle specuicola | No common name | No common name | Q375 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Perityle staurophylla | No common name | No common name | Q1F8 | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle villosa | Hanaupah laphamia | Laphamia, Hanaupah | Q1F9 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Perityle vitreomontana | Glass Mountain rock-daisy | Rock-daisy, Glass Mountain | Q1FA | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perityle warnockii | River rock-daisy | Rock-daisy, river | Q1FB | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Perognathus alticola alticola | White-eared pocket mouse | Mouse, white-eared pocket | A094 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus alticola inexpectatus | Tehachapi white-eared pocket mouse | Mouse, Tehachapi white-eared pocket | A093 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus amplus ammodytes | Coconino Arizona pocket mouse | Mouse, Coconino Arizona pocket | A08Z | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Perognathus amplus amplus | Yavapai Arizona pocket mouse | Mouse, Yavapai Arizona pocket | A095 | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Perognathus amplus cineris | Wupatki Arizona pocket mouse | Mouse, Wupatki Arizona pocket | A0CD | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Perognathus californicus femoralis | Dulzura California pocket mouse | Mouse, Dulzura California pocket | A0G9 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Perognathus fallax fallax | Northwestern San Diego pocket mouse | Mouse, Northwestern San Diego pocket | A0GB | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Perognathus fallax pallidus | Pallid San Diego pocket mouse | Mouse, Pallid San Diego pocket | A0GC | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus flavus goodpasteri | Silky pocket mouse | Mouse, silky pocket | A092 | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Perognathus inornatus | San Joaquin pocket mouse | Mouse, San Joaquin pocket | A0H2 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus inornatus inornatus | San Joaquin pocket mouse | Mouse, San Joaquin pocket | A0C6 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus inornatus psammophilus | Salinas pocket mouse | Mouse, Salinas pocket | A0C4 | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus intermedius nigrimontis | Black Mountain pocket mouse | Mouse, Black Mountain pocket | A0BO | V01 | AZ; | Heteromyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Perognathus longimembris bangsi | Palm Springs little pocket mouse | Mouse, Palm Springs little pocket | A0GD | V01 | CA; | Heteromyidae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Perognathus longimembris brevinasus | Los Angeles little pocket mouse | Mouse, Los Angeles little pocket | A0BU | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Perognathus longimembris internationalis | Jacumba little pocket mouse | Mouse, Jacumba little pocket | A0GA | V01 | CA; | Heteromyidae | NA | Mammals | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Perognathus longimembris pacificus | Pacific pocket mouse | Mouse, Pacific pocket | A0BY | V01 | CA; U.S.A.(CA) | Heteromyidae | Feb 03, 1994 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Peromyscus eremicus papagensis | Pinacate cactus mouse | Mouse, Pinacate cactus | A0C0 | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Peromyscus eremicus pullus | Black Mountain cactus mouse | Mouse, Black Mountain cactus | A0BP | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Peromyscus floridanus | Florida mouse | Mouse, Florida | A090 | V01 | FL; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Peromyscus gossypinus allapaticola | Key Largo cotton mouse | Mouse, Key Largo cotton | A086 | V01 | FL; U.S.A.(FL) | Muridae | Sep 21, 1983 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus gossypinus anastasae | Anastasia Island cotton mouse | Mouse, Anastasia Island cotton | A0BN | V01 | FL, GA; Believed to be extinct | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Peromyscus gossypinus restrictus | Chadwick Beach cotton mouse | Mouse, Chadwick Beach cotton | A0BQ | V01 | FL; Believed to be extinct | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Peromyscus leucopus ammodytes | Monomoy white-footed mouse | Mouse, Monomoy white-footed | A0BW | V01 | MA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Peromyscus leucopus easti | Pungo white-footed mouse | Mouse, Pungo white-footed | A0C3 | V01 | VA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Peromyscus leucopus fusus | Martha's Vineyard white-footed mouse | Mouse, Martha's Vineyard white-footed | A0BV | V01 | MA; | Muridae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Peromyscus maniculatus anacapae | Anacapa deer mouse | Mouse, Anacapa deer | A0BL | V01 | CA; | Muridae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Peromyscus maniculatus clementis | San Clemente deer mouse | Mouse, San Clemente deer | A0C5 | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Peromyscus polionotus allophrys | Choctawhatchee beach mouse | Mouse, Choctawhatchee beach | A08B | V01 | FL; U.S.A.(FL) | Muridae | Jun 06, 1985 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus polionotus ammobates | Alabama beach mouse | Mouse, Alabama beach | A08Y | V01 | AL; U.S.A.(AL) | Muridae | Jun 06, 1985 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus polionotus decoloratus | Pallid oldfield beach mouse | Mouse, pallid oldfield beach | A091 | V01 | FL; Believed to be extinct | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Peromyscus polionotus leucocephalus | Santa Rosa beach mouse | Mouse, Santa Rosa beach | A0C7 | V01 | FL; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Peromyscus polionotus niveiventris | Southeastern beach mouse | Mouse, southeastern beach | A0C9 | V01 | FL; Range includes the beach and coastal scrub found in Brevard, Indian River, and Volusia Counties in Florida.; U.S.A.(FL) | Muridae | May 12, 1989 | Mammals | 4 | Threatened | 4 | US | V | wherever found |
| Peromyscus polionotus peninsularis | St. Andrew beach mouse | Mouse, St. Andrew beach | A0CB | V01 | FL; U.S.A.(FL) | Muridae | Dec 18, 1998 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus polionotus phasma | Anastasia Island beach mouse | Mouse, Anastasia Island beach | A0BM | V01 | FL; Range includes the coastal areas in St. Johns County, Florida. Mainly found at Anastasia State Park and Ft. Matanzas National Monument. ; U.S.A.(FL) | Muridae | May 12, 1989 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus polionotus trissyllepsis | Perdido Key beach mouse | Mouse, Perdido Key beach | A08C | V01 | AL, FL; U.S.A.(AL,FL) | Muridae | Jun 06, 1985 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Peromyscus truei comanche | Palo Duro mouse | Mouse, Palo Duro | A0BZ | V01 | TX; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Persea borbonia humilis | No common name | No common name | Q1FC | P01 | FL, GA; | Lauraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Persicaria hydropiperoides | Swamp smartweed | Smartweed, Swamp | Q1FD | P01 | FL; | Polygonaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Persicaria maculosa | Needles knotweed | Knotweed, Needles | Q1IV | P01 | AZ, CA; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Petalonyx thurberi gilmanii | Death Valley sandpaperplant | Sandpaperplant, Death Valley | Q1FE | P01 | CA; | Loasaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Peteria thompsonae | No common name | No common name | Q2F9 | P01 | AZ, CA, ID, NV, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 1, 2, 6, 8 | US | P | Wherever found |
| Petrogale xanthopus | Yellow-footed rock wallaby | Wallaby, yellow-footed rock | A04E | V01 | Australia | Macropodidae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Petroica multicolor multicolor | Scarlet-breasted robin (flycatcher) | Robin, scarlet-breasted (flycatcher) | B034 | V01 | Australia (Norfolk Island) | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Petroica traversi | Chatham Island robin | Robin, Chatham Island | B033 | V01 | New Zealand | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Petrophytum cinerascens | Chelan rockmat | Rockmat, chelan | Q1FF | P01 | WA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Petrophytum hendersonii | No common name | No common name | Q1FG | P01 | WA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Peucedanum sandwicense | Makou | Makou | Q202 | P01 | HI; U.S.A. (HI) | Apiaceae | Feb 25, 1994 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Pezoporus wallicus | Ground parrot | Parrot, ground | B04K | V01 | Australia | Psittacidae | Jun 04, 1973 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phacelia amabilis | Saline Valley phacelia | Phacelia, Saline Valley | Q1FH | P01 | CA; Possibly extinct | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia anelsonii | Aven Nelson's phacelia | Phacelia, Aven Nelson's | Q2FA | P01 | CA, NV, UT; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Phacelia argentea | Sand dune phacelia | Phacelia, sand dune | Q2FB | P01 | CA, OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US | P | Wherever found |
| Phacelia argillacea | Clay phacelia | Phacelia, clay | Q203 | P01 | UT; U.S.A. (UT) | Hydrophyllaceae | Oct 29, 1978 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Phacelia beatleyae | Beatley phacelia | Phacelia, Beatley | Q1FI | P01 | NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia capitata | [Unnamed] phacelia | Phacelia, [unnamed] | Q1FJ | P01 | OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phacelia cephalotes | Virgin phacelia | Phacelia, virgin | Q1FK | P01 | AZ, UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Phacelia ciliata opaca | Merced phacelia | Phacelia, Merced | Q2FC | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia constancei | No common name | No common name | Q1FM | P01 | AZ, UT; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Phacelia cookei | Cooke's phacelia | Phacelia, Cooke's | Q1FN | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia dalesiana | Trinity phacelia | Phacelia, Trinity | Q1FO | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia demissa heterotricha | [Unnamed] phacelia | Phacelia, [unnamed] | Q1FP | P01 | UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phacelia distans | Ashy phacelia | Phacelia, ashy | Q1FL | P01 | CA; Possibly extinct | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia dubia georgiana | No common name | No common name | Q1FQ | P01 | AL, GA; | Hydrophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Phacelia filiformis | [Unnamed] phacelia | Phacelia, [unnamed] | Q1FR | P01 | AZ; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Phacelia floribunda | Southern island phacelia | Phacelia, southern island | Q2FD | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia formosula | North Park phacelia | Phacelia, North Park | Q204 | P01 | CO; U.S.A. (CO) | Hydrophyllaceae | Sep 01, 1982 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Phacelia glaberrima | No common name | No common name | Q1FS | P01 | NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia greenei | Scott Valley phacelia | Phacelia, Scott Valley | Q1FT | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia howelliana | Howell phacelia | Phacelia, Howell | Q2FE | P01 | AZ, UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Phacelia incana | No common name | No common name | Q2FJ | P01 | NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia inconspicua | No common name | No common name | Q2FF | P01 | ID, NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Phacelia indecora | Drab phacelia | Phacelia, drab | Q1FU | P01 | UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phacelia insularis continentis | Northcoast phacelia | Phacelia, northcoast | Q2FG | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia insularis ssp. insularis | Island phacelia | Phacelia, island | Q1FV | P01 | CA; U.S.A. (CA) | Hydrophyllaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Phacelia integrifolia texana | No common name | No common name | Q2FH | P01 | NM, TX; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Phacelia lenta | Sticky phacelia | Phacelia, sticky | Q1FW | P01 | WA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phacelia mammillarensis | Nipple Bench phacelia | Phacelia, Nipple Bench | Q1FX | P01 | UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phacelia minutissima | [Unnamed] phacelia | Phacelia, [unnamed] | Q3F4 | P01 | ID, NV, OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Phacelia monoensis | Mono phacelia | Phacelia, Mono | Q2FI | P01 | CA, NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia mustelina | Round leaf, Death Valley phacelia | Phacelia, round leaf, Death Valley | Q1FY | P01 | CA, NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia nashiana | Charlotte's phacelia | Phacelia, Charlotte's | Q3F5 | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia novenmillensis | Nine Mile Canyon phacelia | Phacelia, Nine Mile Canyon | Q1FZ | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia orogenes | Mountain phacelia | Phacelia, mountain | Q1G0 | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia pallida | Pale phacelia | Phacelia, pale | Q1G1 | P01 | TX; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Phacelia parishii | Parish's phacelia | Phacelia, Parish's | Q2FK | P01 | CA, NV; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia peckii | No common name | No common name | Q1G2 | P01 | OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phacelia phacelioides | Mt. Diablo phacelia | Phacelia, Mt. Diablo | Q1G3 | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia rafaelensis | [Unnamed] phacelia | Phacelia, [unnamed] | Q1G4 | P01 | AZ, UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Phacelia serrata | Cinder phacelia | Phacelia, cinder | Q1G5 | P01 | AZ, NM; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Phacelia stebbinsii | Stebbins' phacelia | Phacelia, Stebbins' | Q2FL | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia stellaris | Brand's phacelia | Phacelia, Brand's | Q3IO | P01 | CA; | Hydrophyllacea | NA | Flowering Plants | 8 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Phacelia suaveolens keckii | Santiago Peak phacelia | Phacelia, Santiago Peak | Q2FM | P01 | CA; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phacelia submutica | DeBeque phacelia | Phacelia, DeBeque | Q1G6 | P01 | CO; U.S.A. (CO) | Hydrophyllaceae | Aug 26, 2011 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Phacelia utahensis | Utah phacelia | Phacelia, Utah | Q1G7 | P01 | UT; | Hydrophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phacelia verna | No common name | No common name | Q1G8 | P01 | OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phacelia welshii | Welsh phacelia | Phacelia, Welsh | Q1G9 | P01 | AZ; | Hydrophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Phaenicophaeus pyrrhocephalus | Red-faced malkoha (cuckoo) | Malkoha, red-faced (cuckoo) | B022 | V01 | Sri Lanka (Ceylon) | Cuculidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phaeognathus hubrichti | Red Hills salamander | Salamander, Red Hills | D00C | V01 | AL; U.S.A. (AL) | Plethodontidae | Jan 03, 1977 | Amphibians | 4 | Threatened | 4 | US | V | Wherever found |
| Phaeogramma sp. | Po'olanui gall fly | Gall fly, Po'olanui | I0QV | I01 | HI; | Tephritidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Phaeophyscia leana | Lea's Bog lichen | lichen, Lea's Bog | U00I | P01 | IL, KY, PA, TN; | Physciaceae | NA | Lichens | 4 | Not Listed | 3, 4, 5 | US | P | Entire |
| Phaethornis malaris margarettae | Margaretta's hermit | Hermit, Margaretta's | B0CZ | V01 | Brazil | Trochilidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| phainopepla nitens | phainopepla | phainopepla | B0E6 | V01 | bombycillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| phalacrocorax auritus | Double-crested cormorant | cormorant, Double-crested | B0EB | V01 | phalacrocoracidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Pharomachrus mocinno ssp. mocinno | Resplendent quetzel | quetzel, Resplendent | B05L | V01 | Mexico to Panama | Trogonidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phascolarctos cinereus | Koala | Koala | A0HG | V01 | Australia | Phascolarctidae | May 09, 2000 | Mammals | Foreign | Threatened | NA | Foreign | V | Australia |
| Phaseolus supinus | Supine bean | Bean, supine | Q2FN | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Pheidole elecebra | No common name | No common name | I0VC | I01 | Formicidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Phelsuma edwardnewtoni | Day gecko | Gecko, day | C00A | V01 | Indian Ocean-Mauritius | Gekkonidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phelsuma guentheri | Round Island day gecko | Gecko, Round Island day | C00B | V01 | Indian Ocean-Mauritius | Gekkonidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phemeranthus parviflorus | [Unnamed] fameflower | Fameflower, [unnamed] | Q1S6 | P01 | AL; | Portulacaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Phemeranthus sediformis | [Unnamed] fameflower | Fameflower, [unnamed] | Q1S9 | P01 | WA; Canada (B.C.) | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phenacobius teretulus | Kanawha minnow | Minnow, Kanawha | E03W | V01 | NC, VA, WV; | Cyprinidae | NA | Fishes | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Phialanthus myrtilloides | No common name | No common name | Q376 | P01 | PR, VI; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Philadelphus ernestii | Canyon mock orange | Mock orange, canyon | Q1GA | P01 | TX; | Saxifragaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Philadelphus mearnsii | No common name | No common name | Q2FO | P01 | NM, TX; | Saxifragaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Philadelphus texensis texensis | No common name | No common name | Q1GB | P01 | TX; | Saxifragaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Philanthus nasalis | Antioch sphecid wasp | Wasp, Antioch sphecid | I01X | I01 | CA; | Sphecidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Philocasca oron | Clatsop philocascan caddisfly | Caddisfly, Clatsop philocascan | I03K | I01 | OR; Possibly extinct,not reported since 1965 | Limnephilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Philodoria naenaeiella | Kauai naenae philodoria moth | Moth, Kauai naenae philodoria | I0PV | I01 | HI; Possibly extinct,not reported since 1965 | Gracillariidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Philodoria sp. | Oahu hesperonmannia philodoria moth | Moth, Oahu hesperonmannia philodoria | I0PY | I01 | HI; Possibly extinct,not reported since 1965 | Gracillariidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Philodoria ureraella | Oahu opuhe leaf mining moth | Leaf mining moth, Oahu opuhe | I0PJ | I01 | HI; Possibly extinct,not reported since 1965 | Gracillariidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| philomycus bisdodus | grayfoot mantleslug | No common name | G0DO | I01 | philomycidea | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Philotiella leona | Leona's little blue butterfly | Butterfly, Leona's little blue | I0VU | I01 | OR; U.S.A. (OR) | Lycaenidae | NA | Insects | 8 | Not Listed | 1 | US | I | Wherever found |
| Philotiella speciosa bohartorum | Boharts' blue | Blue, Boharts' | I02N | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Phippsia algida | Ice grass | Ice grass | Q2FP | P01 | AK, CO, WY; Canada,U.S.S.R | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6, 7 | US | P | Wherever found |
| Phlox bifida stellaria | Cleft, phlox | Phlox, cleft, | Q2FQ | P01 | AR, IL, IN, KY, MO, TN; | Polemoniaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4 | US | P | Wherever found |
| Phlox buckleyi | No common name | No common name | Q2FR | P01 | VA, WV; | Polemoniaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Phlox caryophylla | [Unnamed] phlox | Phlox, [unnamed] | Q1GC | P01 | CO, NM; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Phlox cluteana | Navajo Mountain phlox | Phlox, Navajo Mountain | Q1GD | P01 | AZ, UT; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Phlox dolichantha | Bear Valley phlox | Phlox, Bear Valley | Q2FS | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Phlox gladiformis | Red Canyon phlox | Phlox, Red Canyon | Q1GE | P01 | NV, UT; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Phlox hirsuta | Yreka phlox | Phlox, Yreka | Q1GG | P01 | CA; ; U.S.A. (CA) | Polemoniaceae | Feb 03, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Phlox idahonis | Clearwater phlox | Phlox, Clearwater | Q1GH | P01 | ID; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phlox jonesii | [Unnamed] phlox | Phlox, [unnamed] | Q1GI | P01 | UT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phlox longifolia ssp. longifolia | Longleaf phlox | Phlox, Longleaf | Q1GF | P01 | UT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phlox missoulensis | [Unnamed] phlox | Phlox, [unnamed] | Q1GJ | P01 | MT; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phlox mollis | [Unnamed] phlox | Phlox, [unnamed] | Q1GK | P01 | ID, OR, WA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phlox nivalis ssp. texensis | Texas trailing phlox | Phlox, Texas trailing | Q205 | P01 | TX; U.S.A. (TX) | Polemoniaceae | Sep 30, 1991 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Phlox oklahomensis | Oklahoma phlox | Phlox, Oklahoma | Q1GL | P01 | KS, OK, TX; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Phlox peckii | No common name | No common name | Q2VC | P01 | OR; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phlox pilosa longipilosa | Long-haired phlox | Phlox, long-haired | Q1GM | P01 | OK; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Phlox pulchra | [Unnamed] phlox | Phlox, [unnamed] | Q1GN | P01 | AL; | Polemoniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Phlox pungens | [Unnamed] phlox | Phlox, [unnamed] | Q377 | P01 | WY; | Polemoniaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Phoca (=Pusa) hispida botnica | Ringed Seal | Seal, Ringed | A0KL | V01 | Wherever found | Phocidae | Feb 26, 2013 | Mammals | NMFS | Threatened | NA | US | V | Wherever found |
| Phoca (=Pusa) hispida hispida | Ringed Seal | Seal, Ringed | A0KJ | V01 | Wherever found | Phocidae | Feb 26, 2013 | Mammals | NMFS | Threatened | NA | US | V | Wherever found |
| Phoca (=Pusa) hispida ladogensis | Ringed seal | Seal, Ringed | A0KI | V01 | Phocidae | Feb 26, 2013 | Mammals | NMFS | Endangered | NA | US/Foreign | V | Ladoga subspecies | |
| Phoca (=Pusa) hispida ochotensis | Ringed Seal | Seal, Ringed | A0KK | V01 | Phocidae | Feb 26, 2013 | Mammals | NMFS | Threatened | NA | US | V | Okhotsk subspecies | |
| Phoca hispida saimensis | Saimaa seal | Seal, Saimaa | A0GO | V01 | Finland (Lake Saimaa) | Phocidae | May 06, 1993 | Mammals | NMFS | Endangered | NA | Foreign | V | Wherever found |
| Phoca largha | Spotted Seal | Seal, spotted | A0K4 | V01 | Pacific Ocean; Sea of Japan and northern Yellow Sea | Phocidae | Apr 13, 2011 | Mammals | NMFS | Threatened | NA | US/Foreign | V | Southern DPS - See 50 CFR 223.102 |
| Phocoena phocoena | Harbor Porpoise | Porpoise, Harbor | A0I7 | V01 | Phocoenidae | NA | Mammals | 5 | Not Listed | NA | US | V | Wherever found | |
| Phocoena sinus | Cochito | Cochito | A0A6 | V01 | Entire; Mexico (Gulf of California) | Phocoenidae | Jan 09, 1985 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phoebastria (=Diomedea) albatrus | Short-tailed albatross | Albatross, short-tailed | B00Y | V03 | AK, CA, HI, OR, WA; Northern Pacific Ocean,Japan,U.S.S.R; Northern Pacific Ocean,Japan,U.S.S.R, Canada, China, Japan, Mexico, Taiwan, U.S.A. (AK, CA, HI, OR, WA) | Diomedeidae | Jun 02, 1970 | Birds | 7 | Endangered | 1, 7, 8 | US/Foreign | V | Wherever found |
| Phoebastria nigripes | Black-footed Albatross | Albatross, black-footed | B0DO | V01 | Diomedeidae | NA | Birds | 1 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Phoebetus robinsoni | Robinson's rain scarab beetle | Beetle, Robinson's rain scarab | I01J | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Phoenicoparrus andinus | Andean flamingo | Flamingo, Andean | B0C0 | V01 | Argentina, Bolivia, Chile, Peru | Phoenicopteridae | Sep 16, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phoenix dactylifera | Sphinx date palm | Palm, sphinx date | Q3NO | P01 | AZ; | Arecaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Pholisma arenarium | Desert christmas tree | Christmas tree, desert | Q1GO | P01 | AZ, CA; Mexico (Baja California) | Lennoaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US | P | Wherever found |
| Pholisma sonorae | Sandfood | Sandfood | Q1GP | P01 | AZ, CA; Mexico (Baja California,Sonora) | Lennoaceae | NA | Flowering Plants | 1 | Not Listed | 2, 8 | US/Foreign | P | Wherever found |
| Photuris brunnipennis floridana | Everglades brownwing firefly | Firefly, Everglades brownwing | I070 | I01 | FL; | Lampyridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Photuris sp. | Turtle Mound firefly | Firefly, Turtle Mound | I072 | I01 | FL; | Lampyridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Phoxinus cumberlandensis | Blackside dace | Dace, blackside | E05I | V01 | KY, TN, VA; Upper Cumberland River basin in Kentucky and Tennessee; and recently introduced by bait-bucket in southwestern Virginia - Clinch and Powell river basins; U.S.A. (TN, KY) | Cyprinidae | Jun 12, 1987 | Fishes | 4 | Threatened | 4, 5 | US | V | Wherever found |
| Phreatodrobia imitata | Mimic cavesnail | Cavesnail, mimic | G04G | I01 | TX; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Phrynops hogei | Brazilian sideneck turtle | Turtle, Brazilian sideneck | C04F | V01 | Brazil | Emydidae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Phrynosoma cornutum | Texas horned lizard | Lizard, Texas horned | C04Z | V01 | CO; | Iguanidae | NA | Reptiles | 2 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Phrynosoma coronatum blainvillii | San Diego horned lizard | Lizard, San Diego horned | C05W | V01 | CA; | Iguanidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Phrynosoma coronatum frontale | California horned lizard | Lizard, California horned | C05R | V01 | CA; | Iguanidae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Phrynosoma douglassii brevirostra | Eastern short-horned lizard | Lizard, eastern short-horned | C05S | V01 | CO; | Iguanidae | NA | Reptiles | 6 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Phrynosoma mcallii | Flat-tailed horned lizard | Lizard, flat-tailed horned | C03K | V01 | AZ; | Iguanidae | NA | Reptiles | 1 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Phyciodes batesii | Tawny crescent | Crescent, tawny | I05E | I01 | DE, GA, MI, MN, NC, ND, NJ, NY, PA, SD, VA, WI, WV; | Nymphalidae | NA | Insects | 3 | Not Listed | 3, 4, 5, 6 | US/Foreign | I | Wherever found |
| Phyciodes cocyta arenacolor | Steptoe Valley crescentspot | Crescentspot, Steptoe Valley | I0NA | I01 | NV; U.S.A. (NV) | Nymphalidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Phyllanthopsis arida | Trans-Pecos maidenbush | Maidenbush, Trans-Pecos | Q01S | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Phyllanthus ericoides | Heather leaf-flower | Leaf-flower, heather | Q1GQ | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Phyllanthus liebmannianus platylepis | No common name | No common name | Q1GR | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Phyllanthus pentaphyllus floridanus | No common name | No common name | Q1GS | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Phyllanthus saffordii | No common name | No common name | Q3OZ | P01 | GU; | Phyllanthaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllanthus sandwicensis degeneri | No common name | No common name | Q1GT | P01 | HI; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllococcus antricolens | Oahu iliahi gall mealybug | Mealybug, Oahu iliahi gall | I0PN | I01 | HI; | Pseudococcidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Phyllococcus oahuensis | Opuhe gall mealybug | Mealybug, Opuhe gall | I0PO | I01 | HI; | Pseudococcidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Phyllostegia ambigua | No common name | No common name | Q2FW | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia bracteata | No common name | No common name | Q37F | P01 | HI; | Lamiaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia brevidens | No common name | No common name | Q2VD | P01 | HI; ; Currently, there is one known occurrence of Phyllostegia brevidens in Kipahulu Valley on the island of Maui (PEPP 2009, p. 90; Wagner et al. 2012, p. 46; PEPP 2014, in litt.). | Lamiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia brevidens ambigua | No common name | No common name | Q1GU | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia brevidens degeneri | No common name | No common name | Q1GV | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia brevidens heterodoxa | No common name | No common name | Q1GW | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia brevidens hirsutula | No common name | No common name | Q1GX | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia brevidens pubescens | No common name | No common name | Q1GY | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia electra | Nehe kuhiwa | Nehe kuhiwa | Q1H4 | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia floribunda | No common name | No common name | Q1GZ | P01 | HI; | Lamiaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia glabra var. lanaiensis | No common name | No common name | Q206 | P01 | HI; U.S.A. (HI) | Lamiaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia haliakalae | No common name | No common name | Q3O0 | P01 | HI; | Lamiaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia helleri | No common name | No common name | Q2FX | P01 | HI; ; This species is currently known from fewer than 10 individuals scattered in Wainiha Valley, which lies within the Wainiha Preserve, on the island of Kauai (PEPP 2014, in litt.). | Lamiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Entire |
| Phyllostegia hillebrandii | No common name | No common name | Q1H0 | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia hirsuta | No common name | No common name | Q1H1 | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia hispida | No common name | No common name | Q3H5 | P01 | HI; U.S.A. (HI) | Lamiaceae | Mar 17, 2009 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia imminuta | No common name | No common name | Q2VE | P01 | HI; Possibly extinct,last observed in 1980. | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia kaalaensis | No common name | No common name | Q3GS | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia knudsenii | No common name | No common name | Q1H2 | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia mannii | No common name | No common name | Q3AE | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia mollis | No common name | No common name | Q2FT | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia mollis fagerlindii | No common name | No common name | Q1H3 | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia parviflora | No common name | No common name | Q1H5 | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia pilosa | No common name | No common name | Q3O1 | P01 | HI; | Lamiaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia racemosa | Kiponapona | Kiponapona | Q37A | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia renovans | No common name | No common name | Q3N1 | P01 | HI; U.S.A. (HI) | Lamiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia rockii | No common name | No common name | Q37D | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia stachyoides | No common name | No common name | Q2FV | P01 | HI; ; Currently, Phyllostegia stachyoides is known from four occurrences: two on Molokai (Puu Alii Natural Area Reserve and upper Hanalilolilo (Kamakou Preserve)); one occurrence in Ukumehame (State (West Maui Forest Reserve) and Private land (West Maui Watershed Partnership)) on Maui; and one occurrence on Hawaii Island (Plant Extinction Prevention Program (PEPP) 2012, p. 132; PEPP 2014, in litt.). | Lamiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia variabilis | No common name | No common name | Q1H6 | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Phyllostegia velutina | No common name | No common name | Q37B | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia waimeae | No common name | No common name | Q378 | P01 | HI; U.S.A. (HI) | Lamiaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia warshaueri | No common name | No common name | Q37C | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia wawrana | No common name | No common name | Q37E | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Phyllostegia yamaguchii | Yamaguchi phyllostegia | Phyllostegia, Yamaguchi | Q1H7 | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Physa natricina | Snake River physa snail | Snail, Snake River physa | G01L | I01 | U.S.A. (ID) | Physidae | Dec 14, 1992 | Snails | 1 | Endangered | NA | US | I | Wherever found |
| Physalis solanaceus | Lemmon globe berry | Globe berry, lemmon | Q2US | P01 | AZ; | Solanaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Physalis viscosa elliotii | No common name | No common name | Q1H8 | P01 | FL; | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Physaria acutifolia purpurea | No common name | No common name | Q2VF | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria bellii | Bell's Twinpod | No common name | Q1H9 | P01 | CO; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria condensata | Dense twinpod | Twinpod, dense | Q1HA | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria didymocarpa lyrata | No common name | No common name | Q1HB | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Physaria dornii | No common name | No common name | Q2VG | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria douglasii ssp. tuplashensis | White Bluffs bladderpod | Bladderpod, White Bluffs | Q3HR | P01 | WA; | Brassicaceae | May 23, 2013 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Physaria eburniflora | No common name | No common name | Q3F6 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria filiformis | Missouri bladderpod | bladderpod, Missouri | Q2CC | P01 | AR, MO; U.S.A. (MO, AR) | Brassicaceae | Jan 08, 1987 | Flowering Plants | 3 | Threatened | 3, 4 | US | P | Wherever found |
| Physaria geyeri purpurea | No common name | No common name | Q1HC | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Physaria globosa | Short's bladderpod | Bladderpod, Short's | Q139 | P01 | IN, KY, TN; | Brassicaceae | Aug 01, 2014 | Flowering Plants | 4 | Endangered | 3, 4 | US | P | Wherever found |
| Physaria grahamii | Graham's twinpod | Twinpod, Graham's | Q207 | P01 | UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria integrifolia monticola | [Unnamed] twinpod | Twinpod, [unnamed] | Q3F7 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria obcordata | Dudley Bluffs twinpod | Twinpod, Dudley Bluffs | Q2VH | P01 | CO; U.S.A. (CO) | Brassicaceae | Feb 06, 1990 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Physaria repanda | Repand Twinpod | Twinpod Repand | Q3MC | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Physaria saximontana saximontana | [Unnamed] twinpod | Twinpod, [unnamed] | Q3F8 | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Physaria stylosa | Duchesne River Twinpod | Twinpod Duchesne River | Q3MD | P01 | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Physella bottimeri | Diamond-Y pond snail | Snail, Diamond-Y pond | G00R | I01 | TX; | Physidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Physella microstriata | Fish Lake physa | Physa, Fish Lake | G02M | I01 | UT; Possibly extinct | Physidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Physella spelunca | Cave physa | Physa, cave | G02L | I01 | WY; | Physidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Physella utahensis | Utah physa | Physa, Utah | G02N | I01 | UT; | Physidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Physella zionis | Wet-rock physa | Physa, wet-rock | G00J | I01 | UT; | Physidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Physeter catodon (=macrocephalus) | Sperm whale | Whale, sperm | A02T | V01 | AK, CA; Oceanic | Physeteridae | Jun 02, 1970 | Mammals | NMFS | Endangered | 7, 8 | US/Foreign | V | Wherever found |
| Physostegia correllii | Correll's false dragon-head | False dragon-head, Correll's | Q1HD | P01 | LA, TX; | Lamiaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US/Foreign | P | Wherever found |
| Physostegia intermedia | No common name | No common name | Q2FY | P01 | OK, TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Physostegia leptophylla | No common name | No common name | Q1HE | P01 | FL, GA, NC, SC, VA; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Physostegia leptophylla | False dragon-head | False dragon-head | Q1HF | P01 | FL, GA; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Physostegia longisepala | No common name | No common name | Q2VI | P01 | LA, TX; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| phytolacca sandwicensis | No comment name | No comment name | Q3K3 | P01 | phytolaccaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Phytotoma raimondii | Peruvian plantcutter | Plantcutter, Peruvian | B0BD | V01 | Peru | Solanaceae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pica nuttalli | Yellow-billed Magpie | Magpie, Yellow-billed | B0N8 | V01 | Corvidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Picathartes gymnocephalus | White-necked rockfowl | Rockfowl, white-necked | B036 | V01 | Africa: Togo to Sierra Leone | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Picathartes oreas | Grey-necked rockfowl | Rockfowl, grey-necked | B035 | V01 | Gabon, Cameroon | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Picoides albolarvatus | White headed Woodpecker | Woodpecker, White-headed | B0HU | V01 | Picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| picoides arcticus | Black-backed woodpecker | woodpecker, Black-backed | B0F5 | V01 | CA, OR, SD; | picidae | NA | Birds | 8 | Not Listed | 1, 6, 8 | US | V | Wherever found |
| Picoides borealis | Red-cockaded woodpecker | Woodpecker, red-cockaded | B04F | V01 | AL, AR, FL, GA, LA, MO, MS, NC, OK, SC, TX, VA; U.S.A. (southcentral and southeastern), Cuba | Picidae | Oct 13, 1970 | Birds | 4 | Endangered | 2, 3, 4, 5 | US | V | Wherever found |
| Picoides nuttallii | Nuttall's Woodpecker | Woodpecker, Nuttall's | B0HT | V01 | Picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| picoides pubescens | Downy woodpecker | woodpecker, Downy | B0EV | V01 | picidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| picoides tridactylus | Three-toed woodpecker | woodpecker, Three-toed | B0E2 | V01 | picidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pieris phillyreifolia | No common name | No common name | Q2FZ | P01 | AL, FL, GA, MS, SC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pilea leptophylla | No common name | No common name | Q1HG | P01 | PR, VI; | Urticaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pilea multicaulis | No common name | No common name | Q1HH | P01 | PR, VI; | Urticaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pilea richardii | No common name | No common name | Q1HI | P01 | PR, VI; | Urticaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pilea yunquensis | No common name | No common name | Q1HJ | P01 | PR, VI; | Urticaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pilosocereus robinii | Key tree cactus | Cactus, Key tree | Q208 | P01 | FL; U.S.A. (FL), Cuba | Cactaceae | Jul 19, 1984 | Flowering Plants | 4 | Endangered | 4 | US/Foreign | P | Wherever found |
| Pilostyles thurberi | Thurber's pilostyles | Pilostyles, Thurber's | Q1HK | P01 | AZ, CA, NV; Mexico (Baja California) | Rafflesiaceae | NA | Flowering Plants | 2 | Not Listed | 2, 8 | US | P | Wherever found |
| Pinckneya bracteata | No common name | No common name | Q1HL | P01 | FL, GA, SC; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pinguicula ionantha | Godfrey's butterwort | Butterwort, Godfrey's | Q2G0 | P01 | FL; U.S.A. (FL) | Lentibulariaceae | Jul 12, 1993 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Pinguicula planifolia | Chapman's butterwort | Butterwort, Chapman's | Q2G1 | P01 | FL; | Lentibulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pinus | Undescribed pine | Pine, undescribed | R00G | P01 | Pinaceae | NA | Conifers and Cycads | NA | Not Listed | NA | P | Wherever found | ||
| Pinus albicaulis | Whitebark pine | Pine, whitebark | R00E | P01 | CA, ID, MT, NV, OR, WA, WY; | Pinaceae | NA | Conifers and Cycads | 6 | Candidate | 1, 6, 8 | US | P | Wherever found |
| Pinus contorta bolanderi | Bolander's beach pine | Pine, Bolander's beach | R00J | P01 | CA; | Pinaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Pinus ponderosa | Ponderosa Pine | Pine, Ponderosa | R00L | P01 | Pinaceae | NA | Conifers and Cycads | 2 | Not Listed | NA | US | P | Wherever found | |
| Pinus radiata | Monterey pine | Pine, Monterey | R00K | P01 | CA; | Pinaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Pinus torreyana insularis | Torrey Island pine | Pine, Torrey Island | R00H | P01 | CA; | Pinaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Pinus torreyana torreyana | Torrey, Del Mar pine | Pine, Torrey, Del Mar | R00I | P01 | CA; | Pinaceae | NA | Conifers and Cycads | 1 | Not Listed | 8 | US | P | Wherever found |
| Pionopsitta pileata | Red-capped parrot | Parrot, red-capped | B05D | V01 | Brazil | Psittacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Piperia yadonii | Yadon's piperia | Piperia, Yadon's | Q3FA | P01 | CA; U.S.A. (CA) | Orchidaceae | Aug 12, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Pipile jacutinga | Black-fronted piping-guan | Piping-guan, black-fronted | B05I | V01 | Argentina | Cracidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pipile pipile pipile | Trinidad white-headed curassow | Curassow, Trinidad white-headed | B019 | V01 | West Indies-Trinidad | Cracidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pipilo chlorurus | Green-tailed Towhee | Towhee, Green-tailed | B0IO | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pipilo crissalis eremophilus | Inyo California towhee | Towhee, Inyo California | B07Q | V01 | CA; | Emberizidae | Aug 03, 1987 | Birds | 8 | Threatened | 8 | US | V | Wherever found |
| Pipilo fuscus relictus | Yuma brown towhee | Towhee, Yuma brown | B07R | V01 | AZ; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US | V | Wherever found |
| Pipilo maculatus clementae | Spotted Towhee | Towhee, Spotted | B09H | V01 | CA; | Emberizidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| pipistrellus hesperus | Western pipistrelle | pipistrelle, Western | A0IX | V01 | vespertilionidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Pipistrellus murrayi | Christmas Island Pipistrelle Bat | Bat, Christmas Island Pipistrelle | A0JM | V01 | Vespertilionidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| piranga rubra | Summer tanager | tanager, Summer | B0E7 | V01 | fringillidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pisidium sanguinichristi | Sangre de Cristo peaclam | Peaclam, Sangre de Cristo | F02B | I01 | NM; | Sphaeriidae | NA | Clams | 2 | Not Listed | 2 | US | I | Wherever found |
| Pisidium ultramontanum | [Unnamed] peaclam | Peaclam, [unnamed] | F01V | I01 | CA, OR; | Sphaeriidae | NA | Clams | 1 | Not Listed | 1, 8 | US | I | Wherever found |
| Pisonia floridana | No common name | No common name | Q2G2 | P01 | FL; Believed to be extinct | Nyctaginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pisonia wagneriana | No common name | No common name | Q37H | P01 | HI; | Nyctaginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pithecophaga jefferyi | Philippine eagle | Eagle, Philippine | B01E | V01 | Philippines | Accipitridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pitta gurneyi | Gurney's pitta | Pitta, Gurney's | B0BC | V01 | Thailand, Myanmar | Pittidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pitta kochi | Koch's pitta | Pitta, Koch's | B05J | V01 | Philippines | Pittidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pittosporum acuminatum leptopodum | No common name | No common name | Q209 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum acuminatum magnifolium | No common name | No common name | Q20A | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum acuminatum waimeanum | No common name | No common name | Q20B | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum argentifolium argentifolium | No common name | No common name | Q2G3 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum argentifolium sessile | No common name | No common name | Q20C | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum cauliflorum cauliflorum | No common name | No common name | Q20D | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum cauliflorum cladanthoides | No common name | No common name | Q20E | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum cauliflorum pedicellatum | No common name | No common name | Q1HO | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum cladanthum gracilipes | No common name | No common name | Q2G4 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum confertiflorum | No common name | No common name | Q2G7 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum confertiflorum longipes | No common name | No common name | Q1HP | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum confertiflorum microphyllum | No common name | No common name | Q2G5 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum glabrum | No common name | No common name | Q2GA | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum glabrum | No common name | No common name | Q20H | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum glabrum glomeratum | No common name | No common name | Q20F | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum glabrum intermedium | No common name | No common name | Q20G | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum glabrum tinifolium | No common name | No common name | Q2G6 | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum halophilum | Hoawa | Hoawa | Q2G8 | P01 | HI; | Pittosporaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pittosporum hawaiiense | Hoawa | Hoawa | Q2G9 | P01 | HI; | Pittosporaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pittosporum hosmeri | No common name | No common name | Q20I | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum insigne micranthum | No common name | No common name | Q20J | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum kauaiense repens | No common name | No common name | Q20K | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum napaliense | Ho`awa | Ho`awa | Q37I | P01 | HI; U.S.A. (HI) | Pittosporaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pittosporum terminalioides lanaiense | No common name | No common name | Q20L | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum terminalioides macropus | No common name | No common name | Q2GB | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pittosporum terminalioides mauiense | No common name | No common name | Q2GC | P01 | HI; | Pittosporaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pituophis melanoleucus lodingi | Black pine snake | Snake, black pine | C029 | V01 | AL, MS; | Colubridae | Nov 05, 2015 | Reptiles | 4 | Threatened | 4 | US | V | Wherever found |
| Pituophis melanoleucus melanoleucus | Northern pine snake | Snake, northern pine | C052 | V01 | AL, DE, GA, NC, NJ, SC, TN, VA, WV; | Colubridae | NA | Reptiles | 4 | Not Listed | 4, 5 | US | V | Wherever found |
| Pituophis melanoleucus mugitus | Florida pine snake | Snake, Florida pine | C03Z | V01 | FL, GA, SC; | Colubridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Pituophis melanoleucus pumilis | Santa Cruz Island gopher snake | Snake, Santa Cruz Island gopher | C04S | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Pituophis ruthveni | Louisiana pine snake | Snake, Louisiana pine | C02C | V01 | LA, TX; | Colubridae | May 07, 2018 | Reptiles | 4 | Threatened | 2, 4 | US | V | Wherever found |
| Pityopsis flexuosa | No common name | No common name | Q1HQ | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pityopsis ruthii | Ruth's golden aster | Aster, Ruth's golden | Q2QK | P01 | TN; U.S.A. (TN) | Asteraceae | Jul 18, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Pityopus californicus | California pine-foot | Pine-foot, California | Q1HR | P01 | CA, OR; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Plagiithmysus swezeyanus | Ahinahina long-horned beetle | Long-horned beetle, ahinahina | I08B | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagiobothrys austiniae | Austin's popcornflower | popcornflower, Austin's | Q3J8 | P01 | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Plagiobothrys distantiflorus | No common name | No common name | Q1HW | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys figuratus ssp. corallicarpus | coral seeded popcornflower | popcornflower, coral seeded | Q1HT | P01 | OR; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Plagiobothrys glaber | Glabrous allocarya | Allocarya, glabrous | Q1HX | P01 | CA; Believed to be extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys glyptocarpus modestus | Cedar Crest allocarya | Allocarya, Cedar Crest | Q37J | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys glyptocarpus var. glyptocarpus | Sculptured popcornflower | popcornflower, Sculptured | Q3JA | P01 | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Plagiobothrys greenei | Greene's popcornflower | popcornflower, Greene's | Q3J9 | P01 | Boraginaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Plagiobothrys hirtus | rough popcornflower | popcornflower, rough | Q1HU | P01 | OR; U.S.A. (OR) | Boraginaceae | Jan 25, 2000 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Plagiobothrys hystriculus | Bearded popcornflower | popcornflower, Bearded | Q1HY | P01 | CA; Believed to be extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys lamprocarpus | [Unnamed] popcornflower | Popcornflower, [unnamed] | Q1HZ | P01 | OR; Believed to be extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Plagiobothrys mollis vestitus | Petaluma popcornflower | Popcornflower, Petaluma | Q2QL | P01 | CA; Possibly extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys scriptus | Scribe allocarya | Allocarya, scribe | Q1I0 | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys strictus | Calistoga allocarya | Allocarya, Calistoga | Q1HV | P01 | CA; U.S.A. (CA) | Boraginaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Plagiobothrys torreyi var. diffusus | San Francisco popcornflower | Popcornflower, San Francisco | Q1HS | P01 | CA; Possibly extinct | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiobothrys uncinatus | Salinas Valley popcornflower | Popcornflower, Salinas Valley | Q37K | P01 | CA; | Boraginaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plagiochila caduciloba | Gorge leafy liverwort | liverwort, Gorge leafy | Q37L | P01 | GA, NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Plagiochila columbiana | No common name | No common name | Q37M | P01 | DC, NC, VA; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Plagiochila echinata | No common name | No common name | Q37N | P01 | NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Plagiochila sharpii | Sharp's leafy liverwort | Liverwort, Sharp's leafy | Q37O | P01 | NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Plagiochila sullivantii var. spinigera | [Unnamed] liverwort | Liverwort, [Unnamed] | Q3KN | P01 | NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Plagiochila sullivantii var. spinigera | [Unnamed] liverwort | Liverwort, [Unnamed] | Q37P | P01 | NC, SC, TN, VA, WV; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Plagiochila sullivantii var. sullivantii | [Unnamed] liverwort | Liverword, [Unnamed] | Q3KO | P01 | NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Plagiochila virginica euryphylla | No common name | No common name | Q37R | P01 | NC; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Plagiochila virginica var. caroliniana | [Unnamed] liverwort | Liverwort, [Unnamed] | Q37Q | P01 | NC, SC, TN, VA; | Plagiochilaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Plagiomnium carolinianum | Carolina mnium | Mnium, Carolina | Q36A | P01 | NC; | Mniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Plagithmysus alani | Maui alani long-horned beetle | Long-horned beetle, Maui alani | I08C | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus annectans | Kauai annectant long-horned beetle | Long-horned beetle, Kauai annectant | I08D | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus bidensae | Bidens long-horned beetle | Long-horned beetle, bidens | I08E | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus bridwelli | Bridwell's long-horned beetle | Long-horned beetle, Bridwell's | I08F | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus claviger | Hawaii clubbed long-horned beetle | Long-horned beetle, Hawaii clubbed | I08G | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus decorus | Hawaii decorus long-horned beetle | Long-horned beetle, Hawaii decorus | I08H | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus dubautianus | Maui dubautia long-horned beetle | Long-horned beetle, Maui dubautia | I08I | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus elegans | Hawaii elegant long-horned beetle | Long-horned beetle, Hawaii elegant | I08J | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus forbesianus | Forbes' Kauai long-horned beetle | Long-horned beetle, Forbes' Kauai | I08K | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus forbesii | Forbes' Maui long-horned beetle | Long-horned beetle, Forbes' Maui | I08L | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus fractus | Molokai fractured long-horned beetle | Long-horned beetle, Molokai fractured | I08M | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus greenwelli | Greenwell's long-horned beetle | Long-horned beetle, Greenwell's | I08N | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus haasi | Haas' `iliahi long-horned beetle | Long-horned beetle, Haas' `iliahi | I08O | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus ignotus | Kauai kalia long-horned beetle | Long-horned beetle, Kauai kalia | I08P | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus koae | Maui koa long-horned beetle | Long-horned beetle, Maui koa | I08Q | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus kohalae | Kohala long-horned beetle | Long-horned beetle, Kohala | I08R | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus kraussi | Krauss' long-horned beetle | Long-horned beetle, Krauss' | I08S | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus kuhnsi | Kuhns' Oahu long-horned beetle | Long-horned beetle, Kuhns' Oahu | I08T | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus lanaiensis | Lanai `ohi`a long-horned beetle | Long-horned beetle, Lanai `ohi`a | I08U | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus laticollis | Maui wide-necked long-horned beetle | Long-horned beetle, Maui wide-necked | I08V | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus longicollis | Long-necked long-horned beetle | Long-horned beetle, long-necked | I08W | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus mezoneuri | Hawaii uhiuhi long-horned beetle | Long-horned beetle, Hawaii uhiuhi | I08X | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus muiri | Muir's ala`a long-horned beetle | Long-horned beetle, Muir's ala`a | I08Y | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus nihoae | Nihoa long-horned beetle | Long-horned beetle, Nihoa | I08Z | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus paludis | Kauai swamp long-horned beetle | Long-horned beetle, Kauai swamp | I090 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus permundus | Kauai `ahakea long-horned beetle | Long-horned beetle, Kauai `ahakea | I091 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus pipturicola | Maui mamaki long-horned beetle | Long-horned beetle, Maui mamaki | I092 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus platydesmae | Pilo kea long-horned beetle | Long-horned beetle, Pilo kea | I093 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus podagricus | Hawaii podagricus long-horned beetle | Long-horned beetle, Hawaii podagricus | I094 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus polystictus | Kauai holio long-horned beetle | Long-horned beetle, Kauai holio | I095 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus pulvillatus | Ohi`a long-horned beetle | Long-horned beetle, Ohi`a | I096 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus rubi | Maui `akala long-horned beetle | Long-horned beetle, Maui `akala | I097 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus simillimus | Maui similar long-horned beetle | Long-horned beetle, Maui similar | I098 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus simplicicollis | Simple-necked long-horned beetle | Long-horned beetle, simple-necked | I099 | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus speculifer | Maui speculifer long-horned beetle | Long-horned beetle, Maui speculifer | I09A | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus sulphurescens | Hawaii opuhe long-horned beetle | Long-horned beetle, Hawaii opuhe | I09B | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus superstes | Oahu super long-horned beetle | Long-horned beetle, Oahu super | I09C | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus swezeyi | Swezey's long-horned beetle | Long-horned beetle, Swezey's | I09D | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus sylvai | Maui forest long-horned beetle | Long-horned beetle, Maui forest | I09E | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagithmysus vicinus | Hawaii alani long-horned beetle | Long-horned beetle, Hawaii alani | I09F | I01 | HI; | Cerambycidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Plagopterus argentissimus | Woundfin | Woundfin | E00Z | V01 | AZ, NV, UT; U.S.A. (UT, NV, AZ) | Cyprinidae | Oct 13, 1970 | Fishes | 6 | Endangered | 2, 6, 8 | US | V | Wherever found, except where listed as an experimental population |
| Plagopterus argentissimus | Woundfin | Woundfin | E00Z | V02 | AZ; U.S.A. (UT, NV, AZ) | Cyprinidae | Jul 24, 1985 | Fishes | 6 | Experimental Population, Non-Essential | 2 | US | V | Gila R. drainage, AZ, NM |
| Planigale ingrami subtilissima | Little planigale | Planigale, little | A03D | V01 | Wherever found | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Planigale tenuirostris | Southern planigale | Planigale, southern | A03E | V01 | Wherever found | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Planorbella magnifica | Magnificent ramshorn | Ramshorn, magnificent | G02R | I01 | NC; | Planorbidae | NA | Snails | 4 | Candidate | 4 | US | I | Wherever found |
| Planorbella multivolvis | Acorn rams-horn | Rams-horn, acorn | G04U | I01 | MI; | Planorbidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Planorbella oregonensis | Lamb Rams-horn | Rams-horn Lamb | G0E6 | I01 | Planorbidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Plantago cordata | Heart-leaved plantain | Plantain, heart-leaved | Q2GD | P01 | AL, AR, DC, GA, IA, IL, IN, KY, MD, MI, MO, NC, NY, OH, TN, VA, WI; Canada (Ont.) | Plantaginaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Plantago hawaiensis | Kuahiwi laukahi | Kuahiwi laukahi | Q37S | P01 | HI; U.S.A. (HI) | Plantaginaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Plantago princeps | Kuahiwi laukahi | Kuahiwi laukahi | Q20M | P01 | HI; U.S.A. (HI) | Plantaginaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Plantago sparsiflora | Pineland plantain | Plantain, pineland | Q37T | P01 | FL, GA, NC, SC; | Plantaginaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Platanista gangetica minor | South Asian River dolphin | Dolphin, South Asian River | A0FR | V01 | Pakistan (Indus River and tributaries) | Platanistidae | Jan 14, 1991 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Platanthera flava | Southern rein-orchid | Rein-orchid, southern | Q1I1 | P01 | AL, AR, DC, DE, FL, GA, IA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MO, NC, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, WV; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4, 5, 6 | US | P | Wherever found |
| Platanthera holochila | No common name | No common name | Q2GE | P01 | HI; U.S.A. (HI) | Orchidaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Platanthera integra | No common name | No common name | Q1I2 | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Platanthera integrilabia | White fringeless orchid | Orchid, white fringeless | Q2GF | P01 | AL, GA, KY, MS, SC, TN; Entire | Orchidaceae | Oct 13, 2016 | Flowering Plants | 4 | Threatened | 4 | US | P | Entire |
| Platanthera leucophaea | Eastern prairie fringed orchid | Orchid, eastern prairie fringed | Q2GG | P01 | IA, IL, IN, ME, MI, MO, OH, VA, WI; Canada (N.B,Ont.); U.S.A. (WI, VA, PA, OK, OH, NY, NJ, NE, MO, MI, ME, IN, IL, IA, AR), Canada (Ont., N.B.) | Orchidaceae | Sep 28, 1989 | Flowering Plants | 3 | Threatened | 3, 5 | US/Foreign | P | Wherever found |
| Platanthera peramoena | Purple fringeless orchid | Orchid, purple fringeless | Q1I3 | P01 | AL, AR, DE, GA, IL, IN, KY, MD, MO, MS, NC, NJ, NY, OH, PA, SC, TN, VA, WV; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Platanthera praeclara | Western prairie fringed Orchid | Orchid, western prairie fringed | Q2YD | P01 | CO, IA, KS, MN, MO, ND, NE, SD, WY; Canada (Man.); U.S.A. (SD, OK, NE, ND, MO, MN, KS, IA), Canada (Man.) | Orchidaceae | Sep 28, 1989 | Flowering Plants | 3 | Threatened | 3, 6 | US/Foreign | P | Wherever found |
| Platanthera shriveri | Shriver's Purple Fringed Orchid | Orchid, Shriver's Purple Fringed | Q3SN | P01 | NC; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Platanthera unalascensis maritima | Alaska rein orchid | Rein orchid, Alaska | Q1I4 | P01 | CA, OR, WA; Canada (B.C.) | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Platanthera zothecina | No common name | No common name | Q33R | P01 | CO, UT; | Orchidaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Platydesma cornuta var. cornuta | No common name | No common name | Q37U | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Platydesma cornuta var. decurrens | No common name | No common name | Q37V | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Platydesma remyi | No common name | No common name | Q1I5 | P01 | HI; | Rutaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Platydesma rostrata | Pilo kea lau li`i | Pilo kea lau li`i | Q37W | P01 | HI; U.S.A. (HI) | Rutaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Platygobio gracilis | Flathead chub | Chub, flathead | E08N | V01 | AL, AR, CO, IA, IL, KS, KY, LA, MN, MO, MT, ND, NE, NM, OK, SD, TN, WY; | Cyprinidae | NA | Fishes | 3 | Not Listed | 2, 3, 4, 6 | US/Foreign | V | Wherever found |
| Platysteira laticincta | Banded wattle-eye | Wattle-eye, banded | B0AB | V01 | Cameroon | Corvidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Platystemon californicus ciliatus | Santa Barbara Island cream cups | Cream cups, Santa Barbara Island | Q2QM | P01 | CA; | Papaveraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Plebejus icarioides austinorum | Spring Mountains icarioides blue butterfly | butterfly, Spring Mountains icarioides blue | I0WG | I01 | NV; | Lycaenidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Plebejus lupini texanus | Lupine blue butterfly | butterfly, lupine blue | I0WE | I01 | Lycaenidae | NA | Insects | 8 | Not Listed | NA | US/Foreign | I | Wherever found | |
| Plebulina emigdionis | San Emigdio blue | Blue, San Emigdio | I02O | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Plecotus rafinesquii | Rafinesque's big-eared bat | Bat, Rafinesque's big-eared | A0AI | V01 | FL, GA, SC; | Vespertilionidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Plecotus townsendii pallescens | Pale Townsend's big-eared bat | Bat, pale Townsend's big-eared | A0GP | V01 | AZ, CA, CO, ID, KS, MT, ND, NE, NM, OK, SD; | Vespertilionidae | NA | Mammals | 2 | Not Listed | 1, 2, 6, 8 | US/Foreign | V | Wherever found |
| plecotus townsendii ssp. pallescens | Townsend's western big-eared bat | bat, Townsend's western big-eared | A0IS | V01 | vespertilionidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| plecotus townsendii ssp. townsendii | Townsend's western big-eared bat | bat, Townsend's western big-eared | A0J1 | V01 | vespertilionidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Plecotus townsendii townsendii | Pacific Townsend's big-eared bat | Bat, Pacific Townsend's big-eared | A0AG | V01 | CA, ID, NV, OR, WA; | Vespertilionidae | NA | Mammals | 1 | Not Listed | 1, 8 | US/Foreign | V | Wherever found |
| Plectrophenax hyperboreus | McKay's bunting | Bunting, McKay's | B0CB | V01 | AK; (St. Mathew Island) | Emberizidae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Plegadis chihi | White-faced ibis | Ibis, white-faced | B071 | V01 | CO; | Threskiornithidae | NA | Birds | 1 | Not Listed | 6 | US/Foreign | V | Wherever found |
| Plejebus icarioides ssp. | Spring Mountains icarioides blue | Blue, Spring Mountains icarioides | I0MW | I01 | CA, NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Spring Mts |
| Plejebus icarioides ssp. | White Mountains icarioides blue | Blue, White Mountains icarioides | I0MV | I01 | CA, NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | White Mts |
| Plejebus saepiolus ssp. | San Gabriel Mountains blue | Blue, San Gabriel Mountains | I0IN | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | San Gabriel Mts |
| Plejebus saepiolus ssp. | White Mountains saepiolus blue | Blue, White Mountains saepiolus | I0MX | I01 | CA, NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | White Mts |
| Plejebus shasta charlestonensis | Spring Mountains blue | Blue, Spring Mountains | I0IO | I01 | NV; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Pleocoma conjugens conjugens | Santa Cruz rain beetle | Beetle, Santa Cruz rain | I0OX | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Pleodendron macranthum | Chupacallos | Chupacallos | Q2GH | P01 | PR; Endemic to Puerto Rico. Known from the Rio Abajo Commonwealth Forest and El Yunque National Forest; U.S.A. (PR) | Canellaceae | Nov 25, 1994 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Pleomele aurea | [Unnamed] halapepe | Halapepe, [unnamed] | Q2GI | P01 | HI; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pleomele fernaldii | Hala pepe | Hala pepe | Q3HU | P01 | HI; | Agavaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pleomele forbesii | Hala pepe | Hala pepe | Q2GJ | P01 | HI; U.S.A. (HI) | Agavaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pleomele hawaiiensis | Hala pepe | Hala pepe | Q37X | P01 | HI; U.S.A. (HI) | Asparagaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Plestiodon egregius egregius | Florida Keys mole skink | Skink, Florida Keys mole | C03U | V01 | FL; | Scincidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Plestiodon egregius insularis | Cedar Key mole skink | Skink, Cedar Key mole | C050 | V01 | FL; | Scincidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethobasus cicatricosus | White wartyback (pearlymussel) | Wartyback, white (pearlymussel) | F00M | I01 | AL, TN; U.S.A. (TN, KY, IN, IL, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Plethobasus cicatricosus | White wartyback (pearlymussel) | Wartyback, white (pearlymussel) | F00M | I02 | U.S.A. (TN, KY, IN, IL, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Plethobasus cooperianus | Orangefoot pimpleback (pearlymussel) | Pimpleback, orangefoot (pearlymussel) | F00R | I01 | AL, IL, KY, TN; U.S.A. (TN, PA, OH, KY, IN, IL, IA, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 3, 4 | US | I | Wherever found |
| Plethobasus cooperianus | Orangefoot pimpleback (pearlymussel) | Pimpleback, orangefoot (pearlymussel) | F00R | I02 | U.S.A. (TN, PA, OH, KY, IN, IL, IA, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Plethobasus cyphyus | Sheepnose Mussel | Mussel, sheepnose | F046 | I01 | AL, IA, IL, IN, KY, MN, MO, MS, OH, PA, TN, VA, WI, WV; U.S.A. (WI, WV, VA, TN, PA, OH, MO, MS, MN, KY, IA, IN, IL, AL) | Unionidae | Apr 12, 2012 | Clams | 3 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Plethodon ainsworthi | Bay Springs salamander | salamander, Bay Springs | D03C | V01 | Plethodontidae | NA | Amphibians | 4 | Not Listed | NA | US | V | Wherever found | |
| Plethodon amplus | Blue Ridge gray-cheeked salamander | Salamander, Blue Ridge gray-cheeked | D04C | V01 | NC; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethodon asupak | Scott Bar salamander | Salamander, Scott Bar | D03W | V01 | CA, OR; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Plethodon caddoensis | Caddo Mountain salamander | Salamander, Caddo Mountain | D01W | V01 | AR; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethodon cheoah | Cheoah Bald salamander | Salamander, Cheoah Bald | D04E | V01 | NC; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| plethodon dunni | Dunn's salamander | salamander, Dunn's | D03L | V01 | plethodontidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Plethodon elongatus | Del Norte salamander | Salamander, Del Norte | D024 | V01 | CA, OR; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Plethodon fourchensis | Fourche Mountain salamander | Salamander, Fourche Mountain | D014 | V01 | AR; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethodon hubrichti | Peaks of Otter salamander | Salamander, Peaks of Otter | D01D | V01 | VA; | Plethodontidae | NA | Amphibians | 5 | Under Review in the Candidate or Petition Process | 5 | US | V | Wherever found |
| Plethodon idahoensis | Coeur d'Alene salamander | Salamander, Coeur d'Alene | D01S | V01 | ID, MT; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 1, 6 | US | V | Wherever found |
| Plethodon kisatchie | Louisiana Slimy Salamander | Salamander, Louisiana Slimy | D03R | V01 | Plethodontidae | NA | Amphibians | 4 | Not Listed | NA | US | V | Wherever found | |
| Plethodon larselli | Larch Mountain salamander | Salamander, Larch Mountain | D00H | V01 | OR, WA; | Plethodontidae | NA | Amphibians | 1 | Not Listed | 1 | US | V | Wherever found |
| Plethodon meridianus | South Mountain gray-cheeked salamander | Salamander, South Mountain gray-cheeked | D04L | V01 | NC; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethodon neomexicanus | Jemez Mountains salamander | Salamander, Jemez Mountains | D019 | V01 | NM; | Plethodontidae | Oct 10, 2013 | Amphibians | 2 | Endangered | 2 | US | V | Wherever found |
| Plethodon nettingi | Cheat Mountain salamander | Salamander, Cheat Mountain | D011 | V01 | WV; U.S.A. (WV) | Plethodontidae | Aug 18, 1989 | Amphibians | 5 | Threatened | 5 | US | V | Wherever found |
| Plethodon ouachitae | Rich Mountain salamander | Salamander, Rich Mountain | D01F | V01 | AR, OK; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 2, 4 | US | V | Wherever found |
| Plethodon petraeus | Pigeon Mountain salamander | salamander, Pigeon Mountain | D04I | V01 | GA; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Plethodon punctatus | Cow Knob salamander | Salamander, Cow Knob | D01V | V01 | VA; | Plethodontidae | NA | Amphibians | 5 | Not Listed | 5 | US | V | Wherever found |
| Plethodon shenandoah | Shenandoah salamander | Salamander, Shenandoah | D01G | V01 | VA; U.S.A. (VA) | Plethodontidae | Aug 18, 1989 | Amphibians | 5 | Endangered | 5 | US | V | Wherever found |
| Plethodon stormi | Siskiyou Mountains salamander | Salamander, Siskiyou Mountains | D00J | V01 | CA, OR; | Plethodontidae | NA | Amphibians | 8 | Not Listed | 1, 8 | US | V | Wherever found |
| plethodon vandykei | Van Dyke's salamander | salamander, Van Dyke's | D03I | V01 | plethodontidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| plethodon vehiculum | Western redback salamander | salamander, Western redback | D03J | V01 | plethodontidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Plethodon welleri | Weller's salamander | salamander, Weller's | D04J | V01 | VA; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 5 | US | V | Wherever found |
| Pleurobema athearni | Canoe Creek Pigtoe | Pigtoe, Canoe Creek | G0CH | I01 | AL; | Unionidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pleurobema chattanoogaense | Painted clubshell | Clubshell, painted | F03Y | I01 | GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurobema clava | Clubshell | Clubshell | F01D | I01 | IL, IN, KY, MI, MS, NY, OH, PA, TN, WV; U.S.A. (WV, TN, PA, OH, MI, KY, IN, IL, AL) | Unionidae | Jan 22, 1993 | Clams | 5 | Endangered | 3, 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Pleurobema clava | Clubshell | Clubshell | F01D | I02 | AL; U.S.A. (WV, TN, PA, OH, MI, KY, IN, IL, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Pleurobema collina | James spinymussel | Spinymussel, James | F025 | I01 | NC, VA, WV; U.S.A. (WV, VA) | Unionidae | Jul 22, 1988 | Clams | 5 | Endangered | 4, 5 | US | I | Wherever found |
| Pleurobema curtum | Black clubshell | Clubshell, black | F011 | I01 | AL, MS; Possibly extinct, habitat remains in MS, but populations have not been found in recent years; U.S.A. (MS, AL) | Unionidae | Apr 07, 1987 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema decisum | Southern clubshell | Clubshell, southern | F036 | I01 | AL, GA, MS, TN; U.S.A. (TN, MS, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema furvum | Dark pigtoe | Pigtoe, dark | F03A | I01 | AL; U.S.A. (AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema georgianum | Southern pigtoe | Pigtoe, southern | F03B | I01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema gibberum | Cumberland pigtoe | Pigtoe, Cumberland | F033 | I01 | TN; U.S.A. (TN) | Unionidae | May 07, 1991 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema hanleyianum | Georgia pigtoe | Pigtoe, Georgia | F03Z | I01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Unionidae | Dec 02, 2010 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema marshalli | Flat pigtoe | Pigtoe, flat | F013 | I01 | AL, MS; U.S.A. (MS, AL) | Unionidae | Apr 07, 1987 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema oviforme | Tennessee clubshell | Clubshell, Tennessee | F01E | I01 | KY, TN, VA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Pleurobema perovatum | Ovate clubshell | Clubshell, ovate | F035 | I01 | AL, GA, MS, TN; U.S.A. (TN, MS, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema plenum | Rough pigtoe | Pigtoe, rough | F00P | I01 | AL, IN, KY, TN, VA; U.S.A. (VA, TN, PA, KY, IN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 3, 4, 5 | US | I | Wherever found |
| Pleurobema plenum | Rough pigtoe | Pigtoe, rough | F00P | I02 | U.S.A. (VA, TN, PA, KY, IN, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Pleurobema pyramidatum | Pink pigtoe | Pigtoe, pink | F01Z | I01 | AL, KY, MS, TN; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurobema pyriforme | Oval pigtoe | Pigtoe, oval | F02S | I01 | AL, FL, GA; U.S.A. (GA, FL, AL) | Unionidae | Mar 16, 1998 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema riddellii | Louisiana Pigtoe | Pigtoe, Louisiana | Q3RF | P01 | Unionidae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | NA | US | P | Wherever found | |
| Pleurobema rubellum | Warrior pigtoe | Pigtoe, warrior | F02U | I01 | AL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurobema rubrum | Pink pigtoe | Pigtoe, pink | F016 | I01 | AL, KY, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pleurobema strodeanum | Fuzzy pigtoe | Pigtoe, fuzzy | F03V | I01 | AL, FL; ; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Pleurobema taitianum | Heavy pigtoe | Pigtoe, heavy | F014 | I01 | AL, MS; U.S.A. (MS, AL) | Unionidae | Apr 07, 1987 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurobema troschelianum | Alabama Clubshell | Clubshell, Alabama | F040 | I01 | GA; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurobema verum | True pigtoe | Pigtoe, true | F02V | I01 | AL; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera alveare | Rugged hornsnail | Hornsnail, rugged | G06W | I01 | AL, AR, KY, MO, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 3, 4 | US | I | Wherever found |
| Pleurocera annulifera | Ringed hornsnail | Hornsnail, ringed | G06U | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera brumbyi | Spiral hornsnail | Hornsnail, spiral | G06Z | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera corpulenta | Corpulent hornsnail | Hornsnail, corpulent | G06T | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pleurocera curta | Shortspire hornsnail | Hornsnail, shortspire | G06X | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pleurocera foremani | Rough hornsnail | Hornsnail, rough | G06V | I01 | AL; U.S.A. (AL) | Pleuroceridae | Dec 02, 2010 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Pleurocera postelli | Broken hornsnail | Hornsnail, broken | G06S | I01 | AL; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera pyrenella | Skirted hornsnail | Hornsnail, skirted | G06Y | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera showalteri | Upland hornsnail | Hornsnail, upland | G071 | I01 | AL, GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera viridulum | [Unnamed] hornsnail | Hornsnail, [unnamed] | G09I | I01 | GA; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleurocera walkeri | Telescope hornsnail | Hornsnail, telescope | G070 | I01 | AL, TN; | Pleuroceridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pleuronaia barnesiana | Tennessee pigtoe | pigtoe, Tennessee | F053 | I01 | AL, GA, MS, NC, TN, VA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Pleuronaia dolabelloides | Slabside Pearlymussel | Pearlymussel, slabside | F01Y | I01 | AL, KY, MS, NC, TN, VA; | Unionidae | Oct 28, 2013 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Pleuropogon hooverianus | Northcoast semaphore grass | Semaphore grass, northcoast | Q1I6 | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pleuropogon oregonus | Oregon semaphore grass | Semaphore grass, Oregon | Q1I7 | P01 | OR; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ploceus golandi | Clarke's weaver | Weaver, Clarke's | B0AC | V01 | Kenya | Ploceidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Plummera ambigens | No common name | No common name | Q20N | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Plutella capparidis | Oahu capper moth | Moth, Oahu capper | I0PX | I01 | HI; Possibly extinct,not reported since 1965 | Plutellidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Poa atropurpurea | San Bernardino bluegrass | Bluegrass, San Bernardino | Q1I9 | P01 | CA; U.S.A. (CA) | Poaceae | Oct 14, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Poa curtifolia | No common name | No common name | Q1IA | P01 | WA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Poa laxiflora | No common name | No common name | Q2VJ | P01 | AK, OR, WA; Canada (B.C.) | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 7 | US | P | Wherever found |
| Poa macrocalyx | No common name | No common name | Q2GO | P01 | AK; | Poaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Poa mannii | Mann's bluegrass | Bluegrass, Mann's | Q2GL | P01 | HI; U.S.A. (HI) | Poaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Poa marcida | No common name | No common name | Q2GM | P01 | OR, WA; Canada (B.C.) | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Poa napensis | Napa bluegrass | Bluegrass, Napa | Q1ID | P01 | CA; U.S.A. (CA) | Poaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Poa paludigena | Bog bluegrass | Bluegrass, bog | Q1IE | P01 | NC; | Poaceae | NA | Flowering Plants | 3 | Not Listed | 4 | US | P | Wherever found |
| Poa palustris | No common name | No common name | Q2GK | P01 | AK; | Poaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Poa paucispicula | No common name | No common name | Q2GN | P01 | AK; | Poaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Poa piperi | Piper's bluegrass | Bluegrass, Piper's | Q2GP | P01 | CA, OR; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Poa rhizomata | Timber bluegrass | Bluegrass, timber | Q2QN | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Poa sandvicensis | Hawaiian bluegrass | Bluegrass, Hawaiian | Q20O | P01 | HI; U.S.A. (HI) | Poaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Poa siphonoglossa | No common name | No common name | Q2GQ | P01 | HI; U.S.A. (HI) | Poaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Poa strictiramea | [Unnamed] bluegrass | Bluegrass, [unnamed] | Q3FB | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Poa strictiramea | Big Bend bluegrass | Bluegrass, Big Bend | Q1IC | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Poa unilateralis | Sea cliff bluegrass | Bluegrass, sea cliff | Q1IF | P01 | WA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Poa X limosa | Lassen County bluegrass | Bluegrass, Lassen County | Q1IB | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Poanes massasoit chermocki | Chermock's mulberry wing skipper | Skipper, Chermock's mulberry wing | I0OB | I01 | MD; | Hesperiidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Podarcis pityusensis | Ibiza wall lizard | Lizard, Ibiza wall | C04D | V01 | Spain (Balearic Islands) | Lacertidae | Feb 29, 1984 | Reptiles | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Podiceps taczanowskii | Junin grebe | Grebe, Junin | B0C7 | V01 | Peru | Podicipedidae | Jul 24, 2012 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Podilymbus gigas | Atitlan grebe | Grebe, Atitlan | B01Q | V01 | Guatemala | Podicipedidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Podistera yukonensis | No common name | No common name | Q2GR | P01 | AK; Canada (Yukon) | Apiaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Podocnemis expansa | Tartaruga | Tartaruga | C00G | V01 | South America-Orinoco River and Amazon River Basins | Pelomedusidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Podocnemis unifilis | Tracaja | Tracaja | C00K | V01 | South America-Orinoco River and Amazon River Basins | Pelomedusidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Poeciliopsis occidentalis | Gila topminnow (incl. Yaqui) | Topminnow, Gila (incl. Yaqui) | E00C | V01 | AZ, NM; U.S.A. (NM, AZ) | Poeciliidae | Mar 11, 1967 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Poecilotheria fasciata | Sri Lankan Ornamental Tarantula | Tarantula, Sri Lankan Ornamental | J03O | I01 | THERAPHOSIDAE | Aug 30, 2018 | Arachnids | Foreign | Endangered | NA | Foreign | I | Wherever found | |
| Poecilotheria formosa | Beautiful Parachute Spider | Spider, Beautiful Parachute | J03P | I01 | THERAPHOSIDAE | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria hanumavilasumica | Rameshwaram Parachute Spider | Spider, Rameshwaram Parachute | J03Q | I01 | THERAPHOSIDAE | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria metallica | Gooty Ornamental Tarantula | Tarantula, Gooty Ornamental | J03N | I01 | Theraphosidae | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria miranda | Red Parachute Spider | Spider, Red Parachute | J03S | I01 | THERAPHOSIDAE | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria ornata | Fringed Ornamental Tarantula | Tarantula, Fringed Ornamental | J03T | I01 | THERAPHOSIDAE | Aug 30, 2018 | Arachnids | Foreign | Endangered | NA | Foreign | I | Wherever found | |
| Poecilotheria pederseni | Pederseni's Tiger Spider | Spider, Pederseni's Tiger | J03U | I01 | THERAPHOSIDAE | Aug 30, 2018 | Arachnids | Foreign | Endangered | NA | Foreign | I | Wherever found | |
| Poecilotheria rufilata | Redslate Ornamental Tarantula | Tarantula, Redslate Ornamental | J03V | I01 | THERAPHOSIDAE | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria smithi | Kandy Parachute Spider | Spider, Kandy Parachute | J03W | I01 | THERAPHOSIDAE | Aug 30, 2018 | Arachnids | Foreign | Endangered | NA | Foreign | I | Wherever found | |
| Poecilotheria striata | Mysore Ornamental Tarantula | Tarantula, Mysore Ornamental | J03X | I01 | THERAPHOSIDAE | NA | Arachnids | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Poecilotheria subfusca | Ivory Ornamental Tarantula | Tarantula, Ivory Ornamental | J03Y | I01 | THERAPHOSIDAE | Aug 30, 2018 | Arachnids | Foreign | Endangered | NA | Foreign | I | Wherever found | |
| Pogogyne abramsii | San Diego mesa-mint | Mesa-mint, San Diego | Q20P | P01 | CA; U.S.A. (CA) | Lamiaceae | Oct 29, 1978 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Pogogyne clareana | Santa Lucia pogogyne | Pogogyne, Santa Lucia | Q1IG | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pogogyne douglasii parviflora | Small-flowered, Douglas' pogogyne | Pogogyne, small-flowered, Douglas' | Q1IH | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pogogyne nudiuscula | Otay mesa-mint | Mesa-mint, Otay | Q2GS | P01 | CA; Mexico (B.C.); U.S.A. (CA), Mexico (Baja California) | Lamiaceae | Aug 03, 1993 | Flowering Plants | 8 | Endangered | 8 | US/Foreign | P | Wherever found |
| Pogonichthys ciscoides | Clear Lake splittail | Splittail, Clear Lake | E07S | V01 | CA; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Pogonichthys macrolepidotus | Sacramento splittail | Splittail, Sacramento | E06U | V01 | CA; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Poladryas minuta minuta | Minute checkerspot butterfly | Butterfly, minute checkerspot | I00L | I01 | NM, TX; | Nymphalidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Polemonium chartaceum | Mason's sky-pilot | Sky-pilot, Mason's | Q2GT | P01 | CA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polemonium nevadense | No common name | No common name | Q1II | P01 | NV; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polemonium occidentale lacustre | [Unnamed] jacob's ladder | Jacob's ladder, [unnamed] | Q1IJ | P01 | MN, WI; | Polemoniaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Polemonium pauciflorum hinckleyi | Hinckley's jacob's ladder | Jacob's ladder, Hinckley's | Q1IK | P01 | AZ, TX; | Polemoniaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polemonium pectinatum | No common name | No common name | Q1IL | P01 | WA; | Polemoniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Polemonium reptans villosum | [Unnamed] jacob's ladder | Jacob's ladder, [unnamed] | Q2GU | P01 | KY, OH; | Polemoniaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Polemonium vanbruntiae | [Unnamed] jacob's ladder | Jacob's ladder, [unnamed] | Q2QO | P01 | CT, DE, MD, ME, NJ, NY, PA, VT, WV; Canada (N.B,Que.) | Polemoniaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Poliomintha glabrescens | Rosemary-mint | Rosemary-mint | Q2GV | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polioptila californica californica | Coastal California gnatcatcher | Gnatcatcher, coastal California | B08X | V01 | CA; U.S.A. (CA), Mexico | Muscicapidae | Mar 30, 1993 | Birds | 8 | Threatened | 8 | US/Foreign | V | Wherever found |
| Polioptila melanura californica | Black-tailed gnatcatcher | Gnatcatcher, black-tailed | B0DJ | V01 | Muscicapidae | NA | Birds | 1 | Not Listed | NA | US/Foreign | V | Wherever found | |
| Polites mardon | Mardon skipper | Skipper, Mardon | I0LY | I01 | CA, OR, WA; | Hesperiidae | NA | Insects | 1 | Not Listed | 1, 8 | US | I | Wherever found |
| Polites sabuleti albomontana | White Mountains sandhill skipper | Skipper, White Mountains sandhill | I0OJ | I01 | CA, NV; | Hesperiidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Polites sabuleti sinemaculata | Denio sandhill skipper | Skipper, denio sandhill | I0OC | I01 | NV; U.S.A. (NV) | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Polyborus plancus audubonii | Audubon's crested caracara | Caracara, Audubon's crested | B06Q | V01 | FL; U.S.A. (FL) | Falconidae | Jul 06, 1987 | Birds | 4 | Threatened | 4 | US | V | U.S.A. (FL) |
| Polycentropus carlsoni | Carlson's polycentropus caddisfly | Caddisfly, Carlson's polycentropus | I03H | I01 | SC; | Polycentropodidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Polycentropus floridensis | Florida brown checkered summer sedge | sedge, Florida brown checkered summer | I0W9 | I01 | AL, FL; | Polycentropodidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Polycentropus harrisi | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0O2 | I01 | AL; | Polycentropidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Polyctenium williamsiae | Combleaf | Combleaf | Q2VK | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polygala alba | No common name | No common name | Q3II | P01 | Polygalaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Polygala boykinii sparsifolia | No common name | No common name | Q1IM | P01 | FL; | Polygalaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Polygala cornuta var. fishiae | Fish's milkwort | Milkwort, Fish's | Q3LB | P01 | CA; | Polygalaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Polygala cowellii | Palo de violeta | Palo de violeta | Q1IN | P01 | PR, VI; | Polygalaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Polygala lewtonii | Lewton's polygala | Polygala, Lewton's | Q20Q | P01 | FL; U.S.A. (FL) | Polygalaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Polygala maravillasensis | Maravillas milkwort | Milkwort, Maravillas | Q1IO | P01 | TX; | Polygalaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygala paucifolia | No common name | No common name | Q3IJ | P01 | Polygalaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Polygala piliophora | No common name | No common name | Q1IP | P01 | AZ; | Polygalaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygala rimulicola mescalerorum | Mescalero milkwort | Milkwort, Mescalero | Q1IQ | P01 | NM; | Polygalaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygala rimulicola rimulicola | No common name | No common name | Q1IR | P01 | NM, TX; | Polygalaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygala smallii | Tiny polygala | Polygala, tiny | Q2GW | P01 | FL; U.S.A. (FL) | Polygalaceae | Jul 18, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Polygala subspinosa heterorhynca | No common name | No common name | Q2GX | P01 | CA, NV; | Polygalaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polygala verticillata | No common name | No common name | Q3IK | P01 | Polygalaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Polygonella basiramia | Wireweed | Wireweed | Q20R | P01 | FL; U.S.A. (FL) | Polygonaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Polygonella macrophylla | Large-leaved jointweed | Jointweed, large-leaved | Q1IS | P01 | FL; | Polygonaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Polygonella myriophylla | Sandlace | Sandlace | Q20S | P01 | FL; U.S.A. (FL) | Polygonaceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Polygonella parksii | Parks' jointweed | Jointweed, Parks' | Q1IT | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygonum aviculare ssp. depressum | Monterey knotweed | Knotweed, Monterey | Q1IX | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polygonum bidwelliae | Bidwell's knotweed | Knotweed, Bidwell's | Q1IU | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polygonum cascadense | No common name | No common name | Q2GY | P01 | OR; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Polygonum hickmanii | Scotts Valley Polygonum | Polygonum, Scotts Valley | Q3HV | P01 | CA; U.S.A. (CA); vicinity of the City of Scotts Valley. | Polygonaceae | Apr 08, 2003 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Polygonum marinense | Marin knotweed | Knotweed, Marin | Q1IW | P01 | CA; | Polygonaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Polygonum pensylvanicum eglandulosum | Lake Erie pinkweed | Pinkweed, Lake Erie | Q1IY | P01 | MO, OH; Canada (Ont.) | Polygonaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Polygonum striatulum | No common name | No common name | Q1IZ | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygonum striatulum | [Unnamed] knotweed | Knotweed, [unnamed] | Q1J0 | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Polygonum utahense | No common name | No common name | Q2GZ | P01 | UT; | Polygonaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Polygyra hippocrepis | Horseshoe liptooth | Liptooth, horseshoe | G025 | I01 | TX; | Polygyridae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Polygyra peregrina | White liptooth | Liptooth, white | G00G | I01 | AR; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Polygyriscus virginianus | Virginia fringed mountain snail | Snail, Virginia fringed mountain | G00Z | I01 | VA; U.S.A. (VA) | Helicodiscidae | Aug 02, 1978 | Snails | 5 | Endangered | 5 | US | I | Wherever found |
| Polylamina pubescens | Wooly Gulf dune scarab | Scarab, Wooly Gulf dune | I0D7 | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Polymnia cossatotensis | Cossatot leaf-cup | Leaf-cup, cossatot | Q37Y | P01 | AR; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Polymnia laevigata | No common name | No common name | Q2H0 | P01 | AL, FL, GA, KY, MO, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Polyodon spathula | Paddlefish | Paddlefish | E040 | V01 | AL, AR, IA, IL, IN, KS, KY, LA, MN, MO, MS, MT, ND, NE, OH, OK, PA, SD, TN, TX, WI; | Polyodontidae | NA | Fishes | 3 | Not Listed | 2, 3, 4, 5, 6 | US | V | Wherever found |
| Polyphylla anteronivea | Saline Valley snow-front june beetle | June beetle, Saline Valley snow-front | I07L | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Polyphylla avittata | Spotted Warner Valley Dunes june beetle | June beetle, Spotted Warner Valley Dunes | I07M | I01 | UT; | Scarabaeidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Polyphylla barbata | Mount Hermon June beetle | Beetle, Mount Hermon June | I0OV | I01 | CA; U.S.A. (CA) | Scarabaeidae | Jan 24, 1997 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Polyphylla erratica | Death Valley june beetle | June beetle, Death Valley | I0L7 | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Polyphylla nubila | Atascodero june beetle | June beetle, Atascodero | I07N | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Polyphylla stellata | Delta june beetle | June beetle, Delta | I0L8 | I01 | CA; | Scarabaeidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Polyplectron emphanum | Palawan peacock pheasant | Pheasant, Palawan peacock | B02U | V01 | Philippines | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Polyscias bisattenuata | No common name | No common name | Q22G | P01 | HI; U.S.A. (HI) | Araliaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Polyscias flynnii | No common name | No common name | Q3N2 | P01 | HI; U.S.A. (HI) | Araliaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Polyscias gymnocarpa | `Ohe`ohe | `Ohe`ohe | Q22F | P01 | HI; U.S.A. (HI) | Araliaceae | Mar 28, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Polyscias lydgatei | No common name | No common name | Q22R | P01 | HI; U.S.A. (HI) | Araliaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Polyscias racemosa | No common name | No common name | Q1ZG | P01 | HI; U.S.A. (HI) | Araliaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Polystichum aleuticum | Aleutian shield fern | Fern, Aleutian shield | S00V | P01 | AK; upper slopes of Mount Reed on Adak Island, Alaska. Type specimen from Atka Island, but that population has not been relocated.; U.S.A. (AK) | Dryopteridaceae | Feb 17, 1988 | Ferns and Allies | 7 | Endangered | 7 | US | P | Wherever found |
| Polystichum calderonense | No common name | No common name | S01V | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Dryopteridaceae | Jun 09, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Polystichum dudleyi | Dudley's swordfern | Swordfern, Dudley's | S01B | P01 | CA; | Aspleniaceae | NA | Ferns and Allies | 1 | Not Listed | 8 | US | P | Wherever found |
| Polystichum kruckebergii | Kruckeberg's swordfern | Swordfern, Kruckeberg's | S00I | P01 | CA, ID, MT, OR, WA; Canada (B.C.) | Aspleniaceae | NA | Ferns and Allies | 1 | Not Listed | 1, 6, 8 | US | P | Wherever found |
| Polysticta stelleri | Steller's Eider | Eider, Steller's | B090 | V01 | AK; North Slope and waters of the Beaufort and Chukchi seas, south along the west coast of Alaska, including St. Lawrence Island, west throughout the Alaska Peninsula and Aleutian Islands, east throughout the Kodiak Archipelago and southern half of Cook Inlet, Eastern portion of range ending at about Valdez and Cordova in Prince William Sound.; U.S.A. (AK breeding population only) | Anatidae | Jun 11, 1997 | Birds | 7 | Threatened | 7 | US | V | U.S. Alaska breeding population only |
| Pomarea mendozae mira | Marquesan monarch | Monarch, Marquesan | B0DB | V01 | Corvidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Pomarea nigra | Tahiti flycatcher | Flycatcher, Tahiti | B01L | V01 | South Pacific Ocean-Tahiti; Tahiti | Tyrannidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pongo pygmaeus | Orangutan | Orangutan | A01Y | V01 | Borneo,Sumatra | Pongidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pooecetes gramineus ssp. affinis | Oregon Vesper Sparrow | Sparrow, Oregon Vesper | B0F9 | V01 | CA, OR, WA; | fringillidae | NA | Birds | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US | V | Wherever found |
| Popenaias popeii | Texas Hornshell | Hornshell, Texas | F02M | I01 | NM, TX; | Unionidae | Mar 12, 2018 | Clams | 2 | Endangered | 2 | US/Foreign | I | Wherever found |
| Populus hinckleyana | Goat Canyon cottonwood | Cottonwood, Goat Canyon | Q1J2 | P01 | TX; | Salicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Porella appalachiana | No common name | No common name | Q37Z | P01 | NC, SC; | Porellaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Porella pinnata | [Unnamed] Liverwort | Liverwort, [Unnamed] | Q3KV | P01 | Porellaceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Porella wataugensis | A Liverwort | No common name | Q3SR | P01 | NC; | Porellaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Porites napopora | No common name | No common name | P01H | I01 | Poritidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Porophyllum greggii | No common name | No common name | Q1J3 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Porophyllum pygmaeum | No common name | No common name | Q3FC | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Porphyrio mantelli | Takahe | Takahe | B0CP | V01 | Rallidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Portulaca caulerpoides | No common name | No common name | Q1J4 | P01 | PR, VI; | Portulacaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Portulaca molokiniensis | No common name | No common name | Q380 | P01 | HI; | Portulacaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Portulaca sclerocarpa | Po`e | Po`e | Q20T | P01 | HI; U.S.A. (HI) | Portulacaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Portulaca smallii | No common name | No common name | Q1J5 | P01 | GA, NC, SC, VA; | Portulacaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Portulaca villosa | Ihi | Ihi | Q381 | P01 | HI; ; Currently, Portulaca villosa in known only from the islands of Nihoa and Maui (in the Lihau section of the West Maui Natural Area Reserve, Alau, LaPerouse, and Cape Hanamanioa) (Hawaii Plant Extinction Prevention Program (PEPP) 2008, p. 75; Starr Environmental 2008, in litt.). | Portulacaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Porzana tabuensis | Spotless Crake | Crake, spotless | B0AH | V01 | AS; Fiji,Marquesas,Polynesia,Philippines,Australia,Society Islands,Tonga,Western Samoa | Rallidae | NA | Birds | 1 | Not Listed | 1 | US | V | American Samoa pop |
| Potamilus amphichaenus | Texas heelsplitter | Heelsplitter, Texas | F02K | I01 | LA, TX; | Unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | 2, 4 | US | I | Wherever found |
| Potamilus capax | Fat pocketbook | Pocketbook, fat | F00T | I01 | AR, IL, IN, KY, LA, MO, MS, TN; U.S.A. (OH, MS, KY, IA, IN, IL, AR) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 3, 4 | US | I | Wherever found |
| Potamilus inflatus | Inflated heelsplitter | heelsplitter, Inflated | F01O | I01 | AL, LA, MS; U.S.A. (MS, LA, AL) | Unionidae | Sep 28, 1990 | Clams | 4 | Threatened | 4 | US | I | Wherever found |
| Potamilus metnecktayi | salina mucket | mucket, salina | F04A | I01 | unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Potamocypris hunteri | Thermophilic ostracod | Ostracod, thermophilic | K05Z | I01 | OR; | Cyprididae | NA | Crustaceans | 8 | Not Listed | 1 | US | I | Wherever found |
| Potamogeton clystocarpus | Little Aguja (=Creek) Pondweed | Pondweed, Little Aguja (=Creek) | Q20U | P01 | TX; U.S.A. (TX) | Potamogetonaceae | Nov 14, 1991 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Potamogeton confervoides | [Unnamed] pondweed | Pondweed, [unnamed] | Q382 | P01 | DE, MA, ME, MI, NC, NH, NJ, NY, PA, SC, VT, WI; | Potamogetonaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 5 | US/Foreign | P | Wherever found |
| Potamogeton floridanus | Florida pondweed | pondweed, Florida | Q2H2 | P01 | FL; | Potamogetonaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Potamogeton hillii | No common name | No common name | Q2VL | P01 | PA; | Potamogetonaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Potamogeton hillii | Hill's pondweed | Pondweed, Hill's | Q1J6 | P01 | CT, MA, MI, NY, OH, PA, VT; Canada (Ont.) | Potamogetonaceae | NA | Flowering Plants | 5 | Not Listed | 3, 5 | US | P | Wherever found |
| Potamogeton lateralis | No common name | No common name | Q2H3 | P01 | CT, MA, MI, MN, NH, NY, VT; | Potamogetonaceae | NA | Flowering Plants | 5 | Not Listed | 3, 5 | US | P | Wherever found |
| Potamogeton ogdenii | [Unnamed] pondweed | Pondweed, [unnamed] | Q383 | P01 | MA, NY, VT; | Potamogetonaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Potamogeton tennesseensis | Tennessee pondweed | pondweed, Tennessee | Q3PJ | P01 | OH; | Potamogetonaceae | NA | Flowering Plants | 5 | Under Review in the Candidate or Petition Process | 3 | US | P | Wherever found |
| Potentilla angelliae | No common name | No common name | Q3FD | P01 | UT; | Rosaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Potentilla basaltica | Soldier Meadows Cinquefoil | Cinquefoil, Soldier Meadows | Q384 | P01 | CA, NV; | Rosaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Potentilla cottamii | No common name | No common name | Q385 | P01 | NV, UT; | Rosaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Potentilla effusa rupincola | Front Range cinquefoil | Cinquefoil, Front Range | Q1J7 | P01 | CO; | Rosaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Potentilla hickmanii | Hickman's potentilla | Potentilla, Hickman's | Q1J8 | P01 | CA; U.S.A. (CA) | Rosaceae | Aug 12, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Potentilla macounii | Macoun's Cinquefoil | Cinquefoil Macoun's | Q3ME | P01 | Rosaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Potentilla multijuga | Ballona cinquefoil | Cinquefoil, Ballona | Q1J9 | P01 | CA; Possibly extinct | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Potentilla rimicola | cliff cinquefoil | cinquefoil, cliff | Q3L6 | P01 | Rosaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Potentilla robbinsiana | Robbins' cinquefoil | Cinquefoil, Robbins' | Q20V | P01 | NH; | Rosaceae | Sep 17, 1980 | Flowering Plants | 5 | Recovery | 5 | US | P | Wherever found |
| Potentilla sierrae-blancae | No common name | No common name | Q1JB | P01 | NM; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Pouteria hotteana | Ala`a | Ala`a | Q386 | P01 | PR, VI; | Sapotaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pouteria sandwicensis | Ala`a | Ala`a | Q1JC | P01 | HI; | Sapotaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pouteria sandwicensis | Ala`a | Ala`a | Q1JD | P01 | HI; | Sapotaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Prasinalia imperialis | Algodones white wax jewel beetle | Jewel beetle, Algodones white wax | I0TO | I01 | Buprestidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Prenanthes barbata | Barbed rattlesnake root | Rattlesnake root, barbed | Q387 | P01 | AL, AR, GA, KY, LA, TN, TX; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Prenanthes boottii | Boott's rattlesnake root | Rattlesnake root, Boott's | Q1JE | P01 | ME, NH, NY, VT; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Prenanthes roanensis | Mountain rattlesnake root | Rattlesnake root, mountain | Q1JF | P01 | NC, TN, VA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Presbytis potenziani | Long-tailed langur | Langur, long-tailed | A06H | V01 | Indonesia | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Indonesia |
| Presbytis senex | Purple-faced langur | Langur, purple-faced | A06I | V01 | Sri Lanka (Ceylon) | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Prietella phreatophila | Mexican blindcat (catfish) | Blindcat, Mexican (catfish) | E00K | V01 | TX; Mexico | Ictaluridae | Jun 02, 1970 | Fishes | Foreign | Endangered | 2 | Foreign | V | Wherever found |
| Primolius couloni | Blue-headed macaw | Macaw, blue-headed | B0GH | V01 | Psittacidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Primula alcalina | [Unnamed] primrose | Primrose, [unnamed] | Q388 | P01 | ID, MT; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Primula capillaris | [Unnamed] primrose | Primrose, [unnamed] | Q1JG | P01 | NV; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Primula cusickiana | Wallowa primrose | Primrose, Wallowa | Q1JH | P01 | ID, OR; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Primula domensis | [Unnamed] primrose | Primrose, [unnamed] | Q389 | P01 | UT; | Primulaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Primula maguirei | Maguire primrose | Primrose, Maguire | Q2H5 | P01 | UT; U.S.A. (UT) | Primulaceae | Aug 21, 1985 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Primula mistassinica | Bird's-eye primrose | Primrose, bird's-eye | Q007 | P01 | IA, IL, ME, MI, MN, NY, VT, WI; | Primulaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Primula nevadensis | [Unnamed] primrose | Primrose, [unnamed] | Q1JI | P01 | NV; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Primula specuicola | North Rim primrose | Primrose, North Rim | Q2H4 | P01 | AZ; | Primulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Primula specuicola | [Unnamed] primrose | Primrose, [unnamed] | Q1JJ | P01 | AZ, UT; | Primulaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Primula tschuktschorum | [Unnamed] primrose | Primrose, [unnamed] | Q38A | P01 | AK; U.S.S.R | Primulaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Primula wilcoxiana | [Unnamed] primrose | Primrose, [unnamed] | Q2QP | P01 | ID; | Primulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Priodontes maximus | Giant armadillo | Armadillo, giant | A04O | V01 | Entire; Venezuela and Guyana to Argentina | Dasypodidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Prionailurus (=Felis) bengalensis bengalensis | Leopard cat | Cat, leopard | A04Y | V01 | Entire; India,Southeast Asia | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Prionailurus (=Felis) bengalensis iriomotensis | Iriomote cat | Cat, Iriomote | A079 | V01 | Entire; Japan (Iriomote Island,Ryukyu Islands) | Felidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Prionailurus (=Felis) planiceps | Flat-headed cat | Cat, flat-headed | A04X | V01 | Entire | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Prionodon pardicolor | Spotted linsang | Linsang, spotted | A05Q | V01 | India (Assam),Myanmar,Cambodia,Laos,Nepal,Vietnam | Viverridae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pristiloma arcticum ssp. crateris | Crater Lake tightcoil | tightcoil, Crater Lake | G0EI | I01 | OR; | Pristilomatidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Pristis clavata | Dwarf sawfish | sawfish, Dwarf | E0D2 | V01 | Pristidae | Jan 12, 2015 | Fishes | NMFS | Endangered | NA | US/Foreign | V | Wherever found | |
| Pristis pectinata | Smalltooth sawfish | Sawfish, smalltooth | E0A9 | V01 | FL, GA; United States, DPS, Gulf of Mexico from Texas to Florida and along the east coast from Florida to Cape Hatteras | Pristidae | Nov 16, 2005 | Fishes | NMFS | Endangered | 4 | US | V | US DPS - Smalltooth sawfish originating from U.S. waters. |
| Pristis pectinata | Smalltooth sawfish | Sawfish, smalltooth | E0A9 | V02 | Pristidae | Jan 12, 2015 | Fishes | NMFS | Endangered | NA | Foreign | V | Non-US DPS - Smalltooth sawfish originating from non-US waters | |
| Pristis pristis | Largetooth Sawfish | Sawfish, largetooth | E0CG | V01 | Pristidae | Jul 23, 2014 | Fishes | NMFS | Endangered | NA | US/Foreign | V | Wherever found | |
| Pristis zijsron | Green sawfish | sawfish, Green | E0D3 | V01 | Pristidae | Jan 12, 2015 | Fishes | NMFS | Endangered | NA | Foreign | V | Wherever found | |
| Pristoceuthophilus sp. | Samwell Cave cricket | Cricket, Samwell Cave | I05O | I01 | CA; | Rhaphidophoridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Pritchardia aylmer-robinsonii | Wahane | Wahane | Q1JK | P01 | HI; U.S.A. (HI) | Arecaceae | Aug 07, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia bakeri | Baker''s Loulu | Loulu, Baker''s | Q3ON | P01 | HI; ; Pritcharida bakeri is currently known from the northern end (Pupukea) and southern end (Kuliouou) of the Koolau Mountain range, on the island of Oahu (Hodel 2009, pp. 173−179; Bacon et al. 2012, pp. 1−17; PEPP 2014, in litt.). | Arecaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia glabrata | Lo`ulu | Lo`ulu | Q1JL | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia glabrata | Lo`ulu | Lo`ulu | Q2H6 | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia hardyi | Lo`ulu | Lo`ulu | Q38C | P01 | HI; U.S.A. (HI) | Asteraceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia hillebrandii | (=Lo`ulu lelo) lo`ulu | Lo`ulu, (=Lo`ulu lelo) | Q1JO | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia kaalae | Lo`ulu | Lo`ulu | Q2VM | P01 | HI; U.S.A. (HI) | Arecaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia lanaiensis | Lo`ulu | Lo`ulu | Q1JQ | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia lanigera | Lo`ulu | Lo`ulu | Q1JR | P01 | HI; | Arecaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia maideniana | Lo`ulu | Lo`ulu | Q38B | P01 | HI; U.S.A. (HI) | Arecaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia martii | Lo`ulu | Lo`ulu | Q1JP | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia martii | Lo`ulu | Lo`ulu | Q1JN | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia minor | Lo`ulu | Lo`ulu | Q1JM | P01 | HI; | Arecaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pritchardia munroi | Lo`ulu | Lo`ulu | Q20W | P01 | HI; U.S.A. (HI) | Arecaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia napaliensis | Lo`ulu | Lo`ulu | Q38D | P01 | HI; U.S.A. (HI) | Arecaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia remota | Lo`ulu | Lo`ulu | Q1JS | P01 | HI; U.S.A. (HI) | Arecaceae | Aug 21, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia schattaueri | Lo`ulu | Lo`ulu | Q2VN | P01 | HI; U.S.A. (HI) | Arecaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pritchardia viscosa | Lo`ulu | Lo`ulu | Q38E | P01 | HI; U.S.A. (HI) | Arecaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Priva portoricensis | No common name | No common name | Q1JT | P01 | PR, VI; | Verbenaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Proatriplex pleiantha | No common name | No common name | Q1JU | P01 | CO, NM, UT; | Chenopodiaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Probarbus jullieni | Ikan temoleh (minnow) | Temoleh, Ikan (minnow) | E01V | V01 | Vietnam, Thailand, Malaysia, Laos, Cambodia | Cyprinidae | Jun 14, 1976 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Problema bulenta | Rare skipper | Skipper, rare | I013 | I01 | GA, MD, NC, SC, VA; | Hesperiidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Proboscidea sabulosa | Dune unicorn plant | Unicorn plant, dune | Q1JV | P01 | NM, TX; | Martyniaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Proboscidea spicata | Many-flowered unicorn plant | Unicorn plant, many-flowered | Q2VO | P01 | TX; | Martyniaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Procambarus acherontis | Orlando Cave crayfish | Crayfish, Orlando Cave | K01L | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus apalachicolae | Coastal Flatwoods crayfish | crayfish, Coastal Flatwoods | K076 | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus attiguus | Silver Glen Springs crayfish | crayfish, Silver Glen Springs | K077 | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus barbiger | Jackson Prairie crayfish | Crayfish, Jackson Prairie | K02W | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus brazoriensis | Brazoria Crayfish | Crayfish, Brazoria | K07R | I01 | Cambaridae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Procambarus cometes | Mississippi flatwoods crayfish | Crayfish, Mississippi flatwoods | K02Y | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus connus | Carrollton crayfish | Crayfish, Carrollton | K026 | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus delicatus | Bigcheek Cave crayfish | crayfish, Bigcheek Cave | K07N | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus echinatus | Edisto crayfish | Crayfish, Edisto | K02V | I01 | SC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus econfinae | Panama City crayfish | Crayfish, Panama City | K05P | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Proposed Threatened | 4 | US | I | Wherever found |
| Procambarus erythrops | Santa Fe Cave crayfish | crayfish, Santa Fe Cave | K079 | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus ferrugineus | [Unnamed] crayfish | Crayfish, [unnamed] | K045 | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus fitzpatricki | Spinytail crayfish | Crayfish, spinytail | K03W | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus franzi | Orange Lake Cave crayfish | crayfish, Orange Lake Cave | K07A | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus horsti | Big Blue Springs Cave crayfish | crayfish, Big Blue Springs Cave | K07B | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus lagniappe | Lagniappe crayfish | Crayfish, lagniappe | K046 | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus leitheuseri | Coastal Lowland Cave crayfish | crayfish, Coastal Lowland Cave | K07C | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus lepidodactylus | Pee Dee lotic crayfish | Crayfish, Pee Dee lotic | K029 | I01 | NC, SC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus liberorum | [Unnamed] crayfish | Crayfish, [unnamed] | K036 | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus lucifugus | Florida Cave crayfish | crayfish, Florida Cave | K07D | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus lucifugus ssp. alachua | Alachua Light Fleeting Cave crayfish | crayfish, Alachua Light Fleeting Cave | K07E | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus lucifugus ssp. lucifugus | Florida Cave crayfish | crayfish, Florida Cave | K07F | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus lylei | Shutispear crayfish | Crayfish, Shutispear | K031 | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus medialis | Albermarle crayfish | Crayfish, Albermarle | K03L | I01 | NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus milleri | Miami Cave crayfish | crayfish, Miami Cave | K07G | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus morrisi | Putnam County Cave crayfish | crayfish, Putnam County Cave | K07H | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus nueces | Nueces Crayfish | Crayfish, Nueces | K07S | I01 | Cambaridae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Procambarus orcinus | Woodville Karst Cave crayfish | crayfish, Woodville Karst Cave | K07I | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus pallidus | Pallid Cave crayfish | crayfish, Pallid Cave | K07J | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus pictus | Black Creek crayfish | Crayfish, Black Creek | K03M | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus plumimanus | Croatan crayfish | Crayfish, Croatan | K03P | I01 | NC; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus pogum | Bearded red crayfish | Crayfish, bearded red | K02U | I01 | MS; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus regalis | Regal Burrowing crayfish | crayfish, Regal Burrowing | K07K | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Procambarus reimeri | Irons Fork Burrowing crayfish | crayfish, Irons Fork Burrowing | K07L | I01 | AR; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Procambarus texanus | Bastrop Crayfish | Crayfish, Bastrop | K07T | I01 | Cambaridae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Procaris hawaiana | Anchialine pool Shrimp | Shrimp, anchialine pool | K03B | I01 | HI; ; Currently in the state of Hawaii, there are estimated to be over 650 anchialine pools, approximately 90 percent of which occur on the island of Hawaii (Brock 2004, p. i). Of the approximately 585 anchialine pools found on the island of Hawaii, only 15 pools are known to contain Procaris hawaiiana. There are 12 pools at Manuka NAR (T. Sakihara, Division of Aquatic Resources (DAR), in litt., 2010) and 1 located at Lua o Palahemo, where P. hawaiiana co-occurs with Vetericaris chaceorum (Holthuis 1973, pp. 12-19; Maciolek 1983, pp. 607-614; Brock 2004, pp. 30-57), another candidate species. On Maui, Procaris hawaiana occurs in two pools at Ahihi-Kinau NAR (Holthuis 1973, pp. 12-19; Maciolek 1983, pp. 607-614; Brock 2004, pp. 30-57). | Procarididae | Oct 31, 2016 | Crustaceans | 1 | Endangered | 1 | US | I | Wherever found |
| Procellaria parkinsoni | Parkinson's black petrel | Petrel, Parkinson's black | B0CF | V01 | Procellariidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Proceratium californicum | Valley oak ant | Ant, Valley oak | I0IF | I01 | CA; | Formicidae | NA | Insects | 1 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Procolobus (=Colobus) pennantii (=kirki) kirki | Zanzibar red colobus monkey | Monkey, Zanzibar red colobus | A01X | V01 | Tanzania (Zanzibar) | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Procolobus (=Colobus) preussi (=badius p.) | Preuss' red colobus monkey | Monkey, Preuss' red colobus | A0A4 | V01 | Cameroon | Cercopithecidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Procolobus (=Colobus) rufomitratus (=badius r.) | Tana River red colobus monkey | Monkey, Tana River red colobus | A01V | V01 | Kenya | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Procotyla typhlops | [Unnamed] planarian | Planarian, [unnamed] | M005 | I01 | VA; | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| Procyon lotor auspicatus | Key Vaca raccoon | Raccoon, Key Vaca | A09D | V01 | FL; | Procyonidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Procyon lotor incautus | Key West raccoon | Raccoon, Key West | A0DP | V01 | FL; | Procyonidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| progne subis | Purple martin | martin, Purple | B0EJ | V01 | hirundinidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Progomphus bellei | Variegated clubtail | Clubtail, variegated | I059 | I01 | AL, FL, NC; | Gomphidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| prophysaon coeruleum | Blue-gray taildropper | taildropper, Blue-gray | G0CC | I01 | arionidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| prophysaon dubium | Papillose taildropper | taildropper, Papillose | G0CE | I01 | arionidae | NA | Snails | 6 | Not Listed | NA | US | I | Wherever found | |
| Propithecus spp. | Sifakas | Sifakas | A03N | V01 | Malagasy Republic (=Madagascar) | Indridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Prosopeia splendens | Crimson shining parrot | Parrot, crimson shining | B0GI | V01 | Psittacidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Prosopium abyssicola | Bear Lake Whitefish | Whitefish Bear Lake | E0B6 | V01 | Salmonidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| prosopium coulterii | Pygmy whitefish | whitefish, Pygmy | E0AT | V01 | salmonidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| Prosopium gemmifer | Bonneville Cisco | Cisco Bonneville | E0B7 | V01 | Salmonidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| Prosopium spilonotus | Bonneville Whitefish | Whitefish Bonneville | E0B8 | V01 | Salmonidae | NA | Fishes | 6 | Not Listed | NA | US | V | Wherever found | |
| Prosopium williamsoni | mountain whitefish | whitefish mountain | E0AM | V01 | CO, ID, MT, NV, OR, WA, WY; | Salmonidae | NA | Fishes | 1 | Not Listed | 1, 6, 8 | US/Foreign | V | Wherever found |
| Prosopium williamsoni | mountain whitefish | whitefish mountain | E0AM | V02 | Salmonidae | NA | Fishes | 1 | Not Listed | NA | US | V | Big Lost River Distinct Population | |
| Proterhinus spp. (ca 72) | Hawaiian proterhinid beetles | Proterhinid beetles, Hawaiian | I0C2 | I01 | HI; | Proterhinidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Protoptila arca | San Marcos saddle-case caddisfly | Caddisfly, San Marcos saddle-case | I049 | I01 | TX; | Glossosomatidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Protoptila balmorhea | Balmorhea saddle-case caddisfly | Caddisfly, Balmorhea saddle-case | I0N0 | I01 | AZ, TX; | Glossosomatidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Protoptila cahabensis | Cahaba saddle-case caddisfly | Caddisfly, Cahaba saddle-case | I0N1 | I01 | AL; | Glossosomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Prunus alleghaniensis | Alleghany plum | Plum, Alleghany | Q1JW | P01 | CT, DE, MD, MI, NJ, PA, VA, WV; | Rosaceae | NA | Flowering Plants | 5 | Not Listed | 3, 5 | US | P | Wherever found |
| Prunus alleghaniensis davisii | No common name | No common name | Q2VP | P01 | MI; | Rosaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Prunus geniculata | Scrub plum | Plum, scrub | Q20X | P01 | FL; U.S.A. (FL); Xeric, sandy ridges of central Florida. | Rosaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Prunus havardii | No common name | No common name | Q1JX | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Prunus maritima gravesii | Beach, Grave's plum | Plum, beach, Grave's | Q1JY | P01 | CT; | Rosaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Prunus minutiflora | No common name | No common name | Q1JZ | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Prunus murrayana | No common name | No common name | Q1K0 | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Prunus texana | No common name | No common name | Q1K1 | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Psammobates geometricus | Geometric turtle | Turtle, geometric | C01G | V01 | South Africa | Testudinidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Psammobotys fordi | Ford's sand dune moth | Moth, Ford's sand dune | I0LH | I01 | CA; | Pyralidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Psephenus arizonensis | Arizona water penny | Water penny, Arizona | I0F9 | I01 | AZ; | Psephenidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Psephenus montanus | White Mountains water penny | Water penny, White Mountains | I0FA | I01 | AZ; | Psephenidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Psephotus chrysopterygius | Golden-shouldered parakeet | Parakeet, golden-shouldered | B02B | V01 | Australia | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Psephotus pulcherrimus | Paradise parakeet | Parakeet, paradise | B02D | V01 | Australia | Psittacidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudacris illinoensis | Illinois chorus frog | Frog, Illinois chorus | D00U | V01 | AR, IL, MO; | Hylidae | NA | Amphibians | 5 | Under Review in the Candidate or Petition Process | 3, 4 | US | V | Wherever found |
| Pseudanophthalmus acherontis | Snail shell cave beetle | Beetle, Snail shell cave | I0IK | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus assimilis | West Wills Valley cave beetle | Beetle, West Wills Valley cave | I0IL | I01 | AL; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus audax | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0Q6 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus avernus | Endless Caverns cave beetle | Cave beetle, Endless Caverns | I0J3 | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus bendermani | Benderman's cave beetle | Cave beetle, Benderman's | I0J4 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus caecus | Clifton Cave beetle | Cave beetle, Clifton | I0Q7 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus calcareus | Limestone cave beetle | Cave beetle, limestone | I0J5 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus catherinae | Catherine's cave beetle | Cave beetle, Catherine's | I0J6 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus catorycetes | Lesser Adams Cave beetle | Cave beetle, lesser Adams | I0Q8 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus colemanensis | Coleman Cave beetle | Cave beetle, coleman | I0T9 | I01 | TN; | Carabidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pseudanophthalmus conditus | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0Q9 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus cordicollis | Little Kennedy cave beetle | Cave beetle, Little Kennedy | I0J7 | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus deceptivus | Deceptive cave beetle | Cave beetle, deceptive | I0J8 | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus egberti | Narrows cave beetle | Cave beetle, Narrows | I0J9 | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus engelhardti | Engelhardt's cave beetle | Cave beetle, Engelhardt's | I0JA | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus exoticus | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QA | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus fastigatus | Tapered cave beetle | Cave beetle, tapered | I0JB | I01 | GA; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus fowlerae | Fowler's cave beetle | Cave beetle, Fowler's | I0JC | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus frigidus | Icebox Cave beetle | Cave beetle, icebox | I0JD | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus fuscus fuscus | Greenbrier Valley cave beetle | Cave beetle, Greenbrier Valley | I0JE | I01 | WV; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus georgiae | Georgian cave beetle | Cave beetle, Georgian | I0JF | I01 | GA; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus globiceps | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QB | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus hadenoecus | Mystic cave beetle | Cave beetle, Mystic | I0JG | I01 | WV; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus hirsutus | Cudjo's cave beetle | Cave beetle, Cudjo's | I0JH | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus holsingeri | Holsinger's Cave Beetle | Cave Beetle, Holsinger's | I0II | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus horni | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QC | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus hortulanus | Garden cave beetle | Cave beetle, garden | I0JI | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus hubbardi | Hubbard's cave beetle | Cave beetle, Hubbard's | I0JJ | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus hubrichti | Hubricht's cave beetle | Cave beetle, Hubricht's | I0JK | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus hypolithos | Stone-dwelling cave beetle | Cave beetle, stone-dwelling | I0JL | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus illinoisensis | Illinois cave beetle | Cave beetle, Illinois | I0JM | I01 | IL; | Carabidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Pseudanophthalmus inexpectatus | Surprising Cave beetle | Cave beetle, surprising | I0S2 | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus inquisitor | Inquirer Cave beetle | Cave beetle, inquirer | I0JN | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus insularis | Baker Station cave beetle | Cave beetle, Baker Station | I0JO | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus intersectus | Crossroads cave beetle | Cave beetle, crossroads | I0JP | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus jonesi | Grassy Cove cave beetle | Cave beetle, Grassy Cove | I0JQ | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus krameri | Kramer's cave beetle | Cave beetle, Kramer's | I0JR | I01 | OH; | Carabidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Pseudanophthalmus krekeleri | Rich Mountain cave beetle | Cave beetle, Rich Mountain | I0JS | I01 | WV; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus lallemanti | Lallemant's cave beetle | Cave beetle, Lallemant's | I0JT | I01 | WV; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus limicola | Shenandoah cave beetle | Cave beetle, Shenandoah | I0JU | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus longiceps | Long-headed cave beetle | Cave beetle, long-headed | I0JV | I01 | VA; | Carabidae | NA | Insects | 4 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus major | Beaver Cave beetle | Cave beetle, beaver | I0QD | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus montanus | Dry Fork Valley cave beetle | Cave beetle, Dry Fork Valley | I0JW | I01 | WV; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus nelsoni | Nelson's cave beetle | Cave beetle, Nelson's | I0JX | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus nickajackensis | Nickajack Cave beetle | Beetle, Nickajack Cave | I0IJ | I01 | TN; Believed to be extinct | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus nortoni | Norton's cave beetle | Cave beetle, Norton's | I0JY | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus occidentalis | Cane Creek cave beetle | Cave beetle, Cane Creek | I0JZ | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus ohioensis | Ohio cave beetle | Cave beetle, Ohio | I0K0 | I01 | OH; | Carabidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Pseudanophthalmus pallidus | Pale cave beetle | Cave beetle, pale | I0K1 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus paradoxus | Sensabush cave beetle | Cave beetle, Sensabush | I0K2 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus parvicollis | Thin-neck cave beetle | Cave beetle, thin-neck | I0K3 | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus parvus | Tatum Cave beetle | Cave beetle, Tatum | I0QE | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus paulus | Nobletts cave beetle | Cave beetle, Nobletts | I0K4 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus paynei | Payne's cave beetle | Cave beetle, Payne's | I0K5 | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus petrunkevitchi | Petrunkevitch's cave beetle | Cave beetle, Petrunkevitch's | I0K6 | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus pholeter | Greater Adams Cave beetle | Cave beetle, greater Adams | I0QF | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus pontis | Natural Bridge cave beetle | Cave beetle, Natural Bridge | I0K7 | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus potomaca potomaca | South Branch Valley cave beetle | Cave beetle, South Branch Valley | I0K8 | I01 | VA, WV; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus potomaca senecae | Seneca cave beetle | Cave beetle, Seneca | I0K9 | I01 | WV; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus praetermissus | Overlooked cave beetle | Cave beetle, overlooked | I0KA | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus punctatus | Spotted cave beetle | Cave beetle, spotted | I0KB | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus pusillus | Martin cave beetle | Cave beetle, Martin | I0KC | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus puteanus | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QG | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus quadratus | Straley's cave beetle | Cave beetle, Straley's | I0KD | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanophthalmus rogersae | Rogers' cave beetle | Cave beetle, Rogers' | I0KE | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus sanctipauli | Saint Paul cave beetle | Cave beetle, Saint Paul | I0KF | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus scholasticus | Sawmill Hollow cave beetle | Cave beetle, Sawmill Hollow | I0KG | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus scutilis | New Mammoth Cave cave beetle | Cave beetle, New Mammoth Cave | I0KH | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus sequoyah | Sequoyah Caverns cave beetle | Cave beetle, Sequoyah Caverns | I0KI | I01 | AL; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus sericus | Silken cave beetle | Cave beetle, Silken | I0KJ | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus sidus | Meridith cave beetle | Cave beetle, Meridith | I0KK | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus simplex | Flyn's hick cave beetle | Cave beetle, Flyn's hick | I0KL | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus simulans | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QH | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus tenebrosus | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QI | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus thomasi | Thomas' cave beetle | Cave beetle, Thomas' | I0KM | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus tiresias | Indian Grave Point (=Soothsayer) cave beetle | Cave beetle, Indian Grave Point (=Soothsayer) | I0KN | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus troglodytes | Louisville Cave beetle | Cave beetle, Louisville | I0QJ | I01 | KY; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus tullahoma | Duck River cave beetle | Beetle, Duck River cave | I0IH | I01 | TN; Believed to be extinct | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus unionis | Union County cave beetle | Cave beetle, Union County | I0KO | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus ventus | Blowing cave beetle | Cave beetle, Blowing | I0KP | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanophthalmus virginicus | Maiden Spring cave beetle | Cave beetle, Maiden Spring | I0KQ | I01 | VA; | Carabidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Pseudanophthalmus wallacei | Wallace's cave beetle | Cave beetle, Wallace's | I0KR | I01 | TN; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudanopthalmus gracilis | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QK | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanopthalmus sp. | Maryland cave beetle | Cave beetle, Maryland | I0P5 | I01 | MD; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanopthalmus sylvaticus | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QL | I01 | WV; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudanopthalmus vicarius | [Unnamed] cave beetle | Cave beetle, [unnamed] | I0QM | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudemydura umbrina | Short-necked or western swamp turtle | Turtle, short-necked or western swamp | C00M | V01 | Australia | Chelidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudemys alabamensis | Alabama red-bellied turtle | Turtle, Alabama red-bellied | C01W | V01 | AL, MS; U.S.A. (AL) | Emydidae | Jun 16, 1987 | Reptiles | 4 | Endangered | 4 | US | V | Wherever found |
| Pseudemys concinna | Mississippi redbelly turtle | Turtle, Mississippi redbelly | C065 | V01 | MS; | Emydidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Pseudemys concinna suwaniensis | Suwanee cooter | Cooter, Suwanee | C01U | V01 | FL; | Emydidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Pseudemys gorzugi | Rio Grande cooter | Cooter, Rio Grande | C079 | V01 | NM, TX; | Emydidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | V | Wherever found |
| Pseudemys nelsoni | Florida Red-bellied turtle | turtle, Florida Red-bellied | C07X | V01 | FL; | Emydidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Pseudemys rubriventris | Northern Red-bellied cooter | cooter, Northern Red-bellied | C07Z | V01 | DC, DE, MA, MD, NC, NJ, NY, PA, VA; | Emydidae | NA | Reptiles | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | V | Wherever found |
| Pseudemys rubriventris bangsi | Plymouth Redbelly Turtle | Turtle, Plymouth Redbelly | C021 | V01 | MA; U.S.A. (MA) | Emydidae | Apr 02, 1980 | Reptiles | 5 | Endangered | 5 | US | V | Wherever found |
| Pseudemys scripta gaigeae | Big Bend slider | Slider, Big Bend | C04O | V01 | TX; | Emydidae | NA | Reptiles | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Pseudemys stejnegeri | Jicotea | Jicotea | C03F | V01 | PR, VI; | Emydidae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Pseudibis gigantea | Giant ibis | Ibis, giant | B0C2 | V01 | Vietnam, Thailand, Cambodia, Lao PDR | Thresliornithidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudirion meridionalis | Meridion blackwater mayfly | Mayfly, Meridion blackwater | I09W | I01 | FL, GA; | Heptageniidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Pseudobahia bahiifolia | Hartweg's golden sunburst | Sunburst, Hartweg's golden | Q1K2 | P01 | CA; U.S.A. (CA) | Asteraceae | Feb 06, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Pseudobahia peirsonii | San Joaquin adobe sunburst | Sunburst, San Joaquin adobe | Q1K3 | P01 | CA; U.S.A. (CA) | Asteraceae | Feb 06, 1997 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Pseudobranchus striatus lustricolus | Gulf Hammock dwarf siren | Siren, Gulf Hammock dwarf | D01N | V01 | FL; | Sirenidae | NA | Amphibians | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Pseudobroscus lentus | Haleakala pseudobroscus ground beetle | Ground beetle, Haleakala pseudobroscus | I0PH | I01 | HI; Possibly extinct,not reported since 1965 | Carabidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Pseudobulweria becki | Beck's petrel | Petrel, Beck's | B0C6 | V01 | Procellariidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Pseudobulweria macgillivrayi | Fiji petrel | Petrel, Fiji | B0C5 | V01 | Pacific Ocean-Fiji (Gau Island) | Procellariidae | Sep 14, 2009 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudocopaeodes eunus alinea | No common name | No common name | I0RW | I01 | CA, NV; Desert areas of southern California and two sites in Nevada | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Pseudocopaeodes eunus eunus | Alkali skipper | Skipper, alkali | I0DS | I01 | CA; Southern CA | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US/Foreign | I | Wherever found |
| Pseudocopaeodes eunus flavus | No common name | No common name | I0RX | I01 | CA, NV; Western and central Nevada and eastern slopes of Sierra Nevada | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Pseudocopaeodes eunus obscurus | Carson wandering skipper | Skipper, Carson wandering | I0RG | I01 | CA, NV; U.S.A. (NV, CA); Washoe CNTY,NV and Lassen CNTY, CA | Hesperiidae | Nov 29, 2001 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Pseudocopaeodes eunus ssp. | No common name | No common name | I0RV | I01 | CA; Mono Lake, California | Hesperiidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Pseudocotalpa andrewsi | Andrews' dune scarab beetle | Scarab beetle, Andrews' dune | I01O | I01 | CA; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Pseudocotalpa giulianii | Giuliani's dune scarab | Scarab, Giuliani's dune | I01N | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Pseudogarypus orpheus | Music Hall Cave pseudoscorpion | Pseudoscorpion, Music Hall Cave | J00Q | I01 | CA; | Pseudogarypidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Pseudognaphalium macounii | No common name | No common name | Q0WH | P01 | DE, IL, NJ; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Pseudognaphalium sandwicensium var. molokaiense | `Ena`ena | `Ena`ena | Q1WN | P01 | HI; | Asteraceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pseudomys fieldi | Field's mouse | Mouse, Field's | A037 | V01 | Australia | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys fumeus | Smoky mouse | Mouse, smoky | A03B | V01 | Wherever found | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys gouldii | Gould's mouse | Mouse, Gould's | A048 | V01 | Australia | Muridae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys novaehollandiae | New Holland mouse | Mouse, New Holland | A038 | V01 | Australia | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys occidentalis | Western mouse | Mouse, western | A03C | V01 | Wherever found | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys praeconis | Shark Bay mouse | Mouse, Shark Bay | A039 | V01 | Wherever found | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudomys shortridgei | Shortridge's mouse | Mouse, Shortridge's | A03A | V01 | Wherever found | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pseudonestor xanthophrys | Maui parrotbill (Kiwikiu) | parrotbill, Maui (Kiwikiu) | B00M | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Pseudopsectra usingeri | Usinger's brown lacewing | Lacewing, Usinger's brown | I07Z | I01 | HI; | Hemerobiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Pseudorca crassidens | false killer whale | whale, false killer | A0KX | V01 | Delphinidae | Dec 28, 2012 | Mammals | NMFS | Endangered | NA | US/Foreign | V | Main Hawaiian Islands Insular DPS See 50 CFR 224.101 | |
| Pseudoscaphirhynchus fedtschenkoi | Syr Darya Sturgeon | Sturgeon, Syr Darya | E0C0 | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pseudoscaphirhynchus hermanni | Dwarf Sturgeon | Sturgeon, Dwarf | E0C1 | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pseudoscaphirhynchus kaufmanni | Large Shovelnose Sturgeon | Sturgeon, Large Shovelnose | E0C2 | V01 | Acipenseridae | NA | Fishes | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pseudosinella certa | Gandy Creek cave springtail | Springtail, Gandy Creek cave | I0M2 | I01 | WV; | Entomobryidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudosinella testa | Shelled cave springtail | Springtail, shelled cave | I0M3 | I01 | WV; | Entomobryidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Pseudotryonia adamantina | Diamond Tryonia | Tryonia, Diamond | G04W | I01 | TX; | Hydrobiidae | Jul 09, 2013 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Psidium sintenisii | Hoja menuda | Hoja menuda | Q1K4 | P01 | PR, VI; | Myrtaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Psiguria cookiana | Algodoncillo | Algodoncillo | Q1K5 | P01 | PR, VI; | Cucurbitaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Psilactis heterocarpa | Welder machearanthera | Machearanthera, Welder | Q35N | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Psilotreta frontalis | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0C3 | I01 | MA; | Odontoceridae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Psittacula echo | Mauritius parakeet | Parakeet, Mauritius | B03V | V01 | Indian Ocean-Mauritius | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Psittirostra psittacea | `O`u (honeycreeper) | `O`u (honeycreeper) | B00J | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Psophodes nigrogularis | Western whipbird | Whipbird, western | B03M | V01 | Australia | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Psorothamnus arborescens arborescens | Mojave indigo bush | Indigo bush, Mojave | Q2H8 | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Psorothamnus kingii | No common name | No common name | Q1K9 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Psorothamnus polydenius var. jonesii | No common name | No common name | Q2H7 | P01 | UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Psorothamnus thompsoniae var. thompsoniae | Thompson's dalea | Dalea, Thompson's | Q1KA | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Psorothamnus thompsoniae var. whitingii | Whiting's dalea | Dalea, Whiting's | Q1K8 | P01 | AZ, UT; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6 | US | P | Wherever found |
| Psychilis krugii | No common name | No common name | Q0P9 | P01 | PR, VI; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Psychomastix deserticola | Desert monkey grasshopper | Grasshopper, desert monkey | I07C | I01 | CA, NV; | Eumastacidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Psychotria grandiflora | Kopiko | Kopiko | Q1KB | P01 | HI; U.S.A. (HI) | Rubiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Psychotria hexandra ssp. oahuensis | Kopiko | Kopiko | Q3H6 | P01 | HI; U.S.A. (HI) | Rubiaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Psychotria hobdyi | Kopiko | Kopiko | Q38F | P01 | HI; U.S.A. (HI) | Rubiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Psychotria insularum paradisii | No common name | No common name | Q1KC | P01 | HI; | Rubiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Psychotria malaspinae | Aplokating-palaoan | Aplokating-palaoan | Q3P0 | P01 | GU; | Rubiaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pteralopex flanneryi | Greater Monkey-Faced Bat | Bat, Greater Monkey-Faced | A0JO | V01 | PTEROPODIDAE | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pteralopex pulchra | Montane Monkey-Faced Bat | Bat, Montane Monkey-Faced | A0JR | V01 | Pteropodidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pteralyxia kauaiensis | Kaulu | Kaulu | Q20Y | P01 | HI; U.S.A. (HI) | Apocynaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pteralyxia laurifolia | Kaulu | Kaulu | Q1KD | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pteralyxia macrocarpa | Kaulu | Kaulu | Q1KE | P01 | HI; U.S.A. (HI) | Apocynaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Pteris lidgatei | No common name | No common name | S00W | P01 | HI; U.S.A. (PR) | Adiantaceae | Sep 26, 1994 | Ferns and Allies | 1 | Endangered | 1 | US | P | Wherever found |
| Pterodroma aterrima | Mascarene black petrel | Petrel, Mascarene black | B09Z | V01 | Indian Ocean-Mauritius (Reunion Island) | Procellariidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pterodroma axillaris | Chatham Island petrel | Petrel, Chatham Island | B0CH | V01 | Pacific Ocean-New Zealand (Chatham Islands) | Procellariidae | Sep 14, 2009 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pterodroma cahow | Bermuda petrel | petrel, Bermuda | B015 | V01 | North Atlantic Ocean-Bermuda | Procellariidae | Jun 02, 1970 | Birds | 4 | Endangered | NA | US/Foreign | V | Wherever found |
| Pterodroma cookii | Cook's petrel | Petrel, Cook's | B0CG | V01 | New Zealand | Procellariidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found |
| Pterodroma hasitata | Black-capped petrel | Petrel, black-capped | B0AS | V01 | GA, NC, SC; Haiti,West Indies | Procellariidae | NA | Birds | 4 | Proposed Threatened | 4 | US | V | Wherever found |
| Pterodroma madeira | Freira | Freira | B09Y | V01 | Portugal (Madeira Island) | Procellariidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pterodroma magentae | Magenta petrel | Petrel, Magenta | B0CI | V01 | Pacific Ocean-New Zealand (Chatham Islands) | Procellariidae | Sep 14, 2009 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pterodroma phaeopygia | Galapagos petrel | Petrel, Galapagos | B0CJ | V01 | Pacific Ocean-Ecuador (Galapagos Islands) | Procellidae | Jan 05, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Pterodroma sandwichensis | Hawaiian petrel | petrel, Hawaiian | B00N | V01 | HI; U.S.A. (HI) | Procellariidae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Pteroglossaspis ecristata | Eulophia | Eulophia | Q2QQ | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pteronotropis euryzonus | Broadstripe shiner | Shiner, broadstripe | E09H | V01 | AL, GA; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Pteronotropis hubbsi | Bluehead shiner | shiner, Bluehead | E0CY | V01 | AR, LA, OK, TX; | Cyprinidae | NA | Fishes | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | V | Wherever found |
| Pteronotus paraguanensis | Paraguana Mustached Bat | Bat, Paraguana Mustached | A0JX | V01 | Mormoopidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pteronura brasiliensis | Giant otter | Otter, giant | A020 | V01 | South America | Mustelidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | South America |
| Pteropus mariannus mariannus | Mariana fruit Bat (=Mariana flying fox) | Bat, Mariana fruit (=Mariana flying fox) | A07X | V04 | GU, MP; Entire | Pteropodidae | Aug 27, 1984 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Pteropus mariannus paganensis | Pagan Mariana flying fox bat | Bat, Pagan Mariana flying fox | A0AH | V01 | MP; | Pteropodidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Pteropus pselaphon | Bonin Flying Fox Bat | Bat, Bonin Flying Fox | A0JL | V01 | Pteropodidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pteropus rodricensis | Rodrigues fruit bat (=flying fox) | Bat, Rodrigues fruit (=flying fox) | A09Y | V01 | Mauritius (Rodrigues Island) | Pteropodidae | Jan 23, 1984 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pteropus samoensis samoensis | Samoan fruit bat | Bat, Samoan fruit | A0A9 | V01 | AS; | Pteropodidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Pteropus tokudae | Little Mariana fruit Bat | Bat, little Mariana fruit | A07W | V01 | GU; Entire; Possibly extinct,not reported since 1968 | Pteropidae | Aug 27, 1984 | Mammals | 1 | Endangered | 1 | US | V | Wherever found |
| pterostichus johnsoni | (Pterostichus johnsoni) ground beetle | ground beetle, (Pterostichus johnsoni) | I0U5 | I01 | carabidae | NA | Insects | 6 | Not Listed | NA | US | I | Wherever found | |
| Pterostichus rothi | Roth's blind ground beetle | Ground beetle, Roth's blind | I0L3 | I01 | OR; | Carabidae | NA | Insects | 2 | Not Listed | 1 | US | I | Wherever found |
| Ptilagrostis porteri | Porter's Feathergrass | Feathergrass, Porter's | Q1KF | P01 | CO; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Ptilimnium ahlesii | Carolina bishopweed | bishopweed, Carolina | Q3PK | P01 | GA, NC, SC; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Ptilimnium nodosum | Harperella | Harperella | Q2H9 | P01 | AL, AR, GA, MD, NC, OK, SC, VA, WV; U.S.A. (WV, SC, NC, MD, GA, AR, AL) | Apiaceae | Oct 28, 1988 | Flowering Plants | 5 | Endangered | 2, 4, 5 | US | P | Wherever found |
| Ptilinopus perousii perousii | Many-colored Fruit-Dove | Fruit-Dove, Many-colored | B0AK | V01 | AS; | Columbidae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| Ptilinopus roseicapilla | Mariana fruit dove | Dove, Mariana fruit | B05Y | V01 | GU, MP; | Columbidae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| ptomaphagus cocytus | No common name | No common name | I0UK | I01 | leiodidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Ptychobranchus greenii | Triangular Kidneyshell | Kidneyshell, triangular | F037 | I01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Unionidae | Mar 17, 1993 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Ptychobranchus jonesi | Southern kidneyshell | Kidneyshell, southern | F02N | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Ptychobranchus occidentalis | Ouachita kidneyshell | Kidneyshell, Ouachita | F03G | I01 | AR, KS, MO, OK; | Unionidae | NA | Clams | 6 | Not Listed | 2, 3, 4, 6 | US | I | Wherever found |
| Ptychobranchus subtentum | Fluted kidneyshell | Kidneyshell, fluted | F041 | I01 | KY, TN, VA; | Unionidae | Oct 28, 2013 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found |
| Ptychocheilus lucius | Colorado pikeminnow (=squawfish) | Pikeminnow (=squawfish), Colorado | E006 | V01 | AZ, CA, CO, NM, UT, WY; U.S.A. (WY, UT, NV, NM, CO, CA, AZ), Mexico | Cyprinidae | Mar 11, 1967 | Fishes | 6 | Endangered | 2, 6, 8 | US | V | Wherever found, except where listed as an experimental population |
| Ptychocheilus lucius | Colorado pikeminnow (=squawfish) | Pikeminnow (=squawfish), Colorado | E006 | V02 | AZ, NM; U.S.A. (WY, UT, NV, NM, CO, CA, AZ), Mexico | Cyprinidae | Jul 24, 1985 | Fishes | 6 | Experimental Population, Non-Essential | 2 | US | V | Salt and Verde R. drainages, AZ |
| Ptychoramphus aleuticus | Cassin's Auklet | Auklet, Cassin's | B0FP | V01 | Laridae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| Puccinellia howellii | Howell's alkali grass | Alkali grass, Howell's | Q3FE | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Puccinellia nutkaensis | [Unnamed] alkali grass | Alkali grass, [unnamed] | Q2HA | P01 | AK; | Poaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Puccinellia parishii | Parish's alkali grass | Alkali grass, Parish's | Q1KG | P01 | AZ, CA, CO, NM; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Pudu pudu | Pudu | Pudu | A061 | V01 | Southern South America | Cervidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Puffinus auricularis newelli | Newell's Townsend's shearwater | Shearwater, Newell's Townsend's | B04O | V01 | HI; ; U.S.A. (HI) | Procellariidae | Oct 28, 1975 | Birds | 1 | Threatened | 1 | US | V | Wherever found |
| Puffinus heinrothi | Heinroth's shearwater | Shearwater, Heinroth's | B0C4 | V01 | Pacific Ocean-Papua New Guinea (Bougainville Island), Solomon Islands (Kolom-bangara and Rendova) | Procellariidae | Jan 05, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Puma (=Felis) concolor (all subsp. except coryi) | Puma (=mountain lion) | Puma (=mountain lion) | A0G0 | V01 | FL; U.S.A. (FL) | Felidae | Aug 14, 1991 | Mammals | 5 | Similarity of Appearance to a Threatened Taxon | 4 | US | V | U.S.A. (FL) |
| Puma (=Felis) concolor coryi | Florida panther | Panther, Florida | A008 | V01 | FL; U.S.A.(LA and AR east to SC and FL) | Felidae | Mar 11, 1967 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Puma (=Felis) concolor costaricensis | Costa Rican puma | Puma, Costa Rican | A062 | V01 | Panama, Nicaragua, Costa Rica | Felidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Puma (=Felis) concolor couguar | Eastern puma (=cougar) | Puma (=cougar), eastern | A046 | V01 | Eastern North America; Presumed extinct in wild | Felidae | Jun 04, 1973 | Mammals | 5 | Extinction | NA | US/Foreign | V | Wherever found |
| Purshia (=Cowania) subintegra | Arizona Cliffrose | Cliffrose, Arizona | Q20Z | P01 | AZ; U.S.A. (AZ) | Rosaceae | May 29, 1984 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Pycnanthemum curvipes | No common name | No common name | Q1KH | P01 | AL, GA, TN; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pycnanthemum floridanum | No common name | No common name | Q1KI | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pycnanthemum monotrichum | [Unnamed] mountain-mint | Mountain-mint, [unnamed] | Q1KJ | P01 | VA; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Pycnanthemum torrei | Torrey's mountainmint | mountainmint, Torrey's | Q3KP | P01 | NC; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pyganodon gibbosa | Inflated floater | floater, Inflated | F04Z | I01 | GA; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Pygathrix nemaeus | Douc langur | Langur, Douc | A01H | V01 | Vietnam,Laos,Cambodia | Cercopithecidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pyreferra ceromatica | Annointed sallow noctuid moth | Noctuid moth, Annointed sallow | I0BL | I01 | AL, CT, DE, FL, IN, MA, ME, NC, NJ, NY, PA, SC; | Noctuidae | NA | Insects | 4 | Not Listed | 3, 4, 5 | US/Foreign | I | Wherever found |
| Pyrgulopsis | Columbia springsnail | Springsnail, Columbia | G0CA | I01 | Hydrobiidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Pyrgulopsis (=Marstonia) pachyta | Armored snail | Snail, armored | G03B | I01 | AL; U.S.A. (AL) | Hydrobiidae | Feb 25, 2000 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Pyrgulopsis aardahli | Aardhals springsnail | Springsnail, Aardhals | G0BL | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis agarhecta | Ocmulgee marstonia | Marstonia, Ocmulgee | G028 | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pyrgulopsis aloba | Duckwater pyrg | Pyrg, Duckwater | G0F1 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis anatina | Southern Duckwater pyrg | Pyrg, Southern Duckwater | G0F2 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis anguina | Longitudinal pyrg | Pyrg, longitudinal | G0F3 | I01 | NV, UT; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 6, 8 | US | I | Wherever found |
| Pyrgulopsis arizonae | Bylas springsnail | Springsnail, Bylas | G04Y | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Pyrgulopsis avernalis | Moapa pebblesnail | Pebblesnail, Moapa | G001 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis bacchus | Grand Wash springsnail | Springsnail, Grand Wash | G052 | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Pyrgulopsis bernardina | San Bernardino springsnail | springsnail, San Bernardino | G05E | I01 | AZ; U.S.A. (AZ); Mexico (Sonora) | Hydrobiidae | May 17, 2012 | Snails | 2 | Threatened | 2 | US | I | Wherever found |
| Pyrgulopsis breviloba | Flag pyrg | Pyrg, flag | G0F4 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis bruneauensis | Bruneau Hot springsnail | Springsnail, Bruneau Hot | G03R | I01 | ID; U.S.A. (ID) | Hydrobiidae | Jan 25, 1993 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Pyrgulopsis carinifera | Moapa Valley pyrg | Pyrg, Moapa Valley | G0F5 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis castor | Beaver pond marstonia | Marstonia, beaver pond | G029 | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pyrgulopsis chupaderae | Chupadera springsnail | Springsnail, Chupadera | G03S | I01 | NM; U.S.A. (NM) | Hydrobiidae | Aug 13, 2012 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Pyrgulopsis coloradensis | Blue Point pyrg | Pyrg, Blue Point | G0F6 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis conica | Kingman springsnail | Springsnail, Kingman | G053 | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Pyrgulopsis crystalis | Crystal springsnail | Springsnail, Crystal | G054 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis deaconi | Spring Mountains pyrg | Pyrg, Spring Mountains | G0F7 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis deserta | Desert springsnail snail | Snail, desert springsnail | G00Q | I01 | AZ, UT; | Hydrobiidae | NA | Snails | 6 | Not Listed | 2, 6 | US | I | Wherever found |
| Pyrgulopsis erythropoma | Ash Meadows pebblesnail | Pebblesnail, Ash Meadows | G00I | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis fairbanksensis | Fairbanks springsnail | Springsnail, Fairbanks | G055 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis fausta | Corn Creek pyrg | Pyrg, Corn Creek | G0F8 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis gilae | Gila springsnail | Springsnail, Gila | G04A | I01 | NM; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis glandulosa | Verde Rim springsnail | Springsnail, Verde Rim | G056 | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis gracilis | Emigrant pyrg | Pyrg, emigrant | G0F9 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis hamlinensis | Hamlin Valley pyrg | Pyrg, Hamlin Valley | G0FA | I01 | UT; | Hydrobiidae | NA | Snails | 6 | Under Review in the Candidate or Petition Process | 6 | US | I | Wherever found |
| Pyrgulopsis hendersoni | Harney Lake springsnail | Springsnail, Harney Lake | G0C9 | I01 | Hydrobiidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Pyrgulopsis hubbsi | Hubbs pyrg | Pyrg, Hubbs | G0FB | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis idahoensis | Idaho springsnail | Springsnail, Idaho | G04D | I01 | ID; | Hydrobiidae | Dec 14, 1992 | Snails | 1 | Original Data in Error - Taxonomic Revision | 1 | US | I | Wherever found |
| Pyrgulopsis isolata | Elongate-gland Springsnail | Springsnail, elongate-gland | G057 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis landyei | Landyes pyrg | Pyrg, Landyes | G0FC | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis lata | Butterfield pyrg | Pyrg, Butterfield | G0FD | I01 | NV; | Hyrdobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis lockensis | Lockes pyrg | Pyrg, Lockes | G0FE | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis marcida | Hardy pyrg | Pyrg, hardy | G0FF | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis merriami | Pahranagat pebblesnail | Pebblesnail, Pahranagat | G00H | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis micrococcus | Oasis Valley springsnail | Springsnail, Oasis Valley | G010 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis montana | Camp Valley pyrg | Pyrg, Camp Valley | G0FG | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis montezumensis | Montezuma Well springsnail | Springsnail, Montezuma Well | G058 | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis morrisoni | Page springsnail | Springsnail, Page | G059 | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis nanus | Distal-gland springsnail | Springsnail, distal-gland | G03U | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis neomexicana | Socorro springsnail | Springsnail, Socorro | G05P | I01 | NM; U.S.A. (NM) | Hydrobiidae | Sep 30, 1991 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Pyrgulopsis neritella | Neritiform Steptoe Ranch pyrg | Pyrg, Neritiform Steptoe Ranch | G0FH | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis notidicola | Elongate mud meadows Springsnail | Springsnail, elongate mud meadows | G0C6 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis ogmorhaphe | Royal marstonia (snail) | Marstonia, royal (snail) | G027 | I01 | TN; U.S.A. (TN) | Hydrobiidae | Apr 15, 1994 | Snails | 4 | Endangered | 4 | US | I | Wherever found |
| Pyrgulopsis olivacea | Olive marstonia | Marstonia, olive | G073 | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pyrgulopsis orbiculata | Sub-globose Steptoe Ranch pyrg | Pyrg, sub-globose Steptoe Ranch | G0FI | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis owensensis | Owens springsnail | Springsnail, Owens | G0BM | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis ozarkensis | Ozark pyrg | Pyrg, Ozark | G082 | I01 | AR; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Pyrgulopsis papillata | Big Warm Spring pyrg | Pyrg, Big Warm Spring | G0FJ | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis pecosensis | Pecos springsnail | Springsnail, Pecos | G04B | I01 | NM; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis peculiaris | Bifid duct pyrg | Pyrg, bifid duct | G0FK | I01 | NV, UT; | Hydrobiidae | NA | Snails | 6 | Not Listed | 6, 8 | US | I | Wherever found |
| Pyrgulopsis perturbata | Fish Slough springsnail | Springsnail, Fish Slough | G0BN | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis pisteri | Median-gland Nevada springsnail | Springsnail, median-gland Nevada | G03V | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis planulata | Flat-topped Steptoe pyrg | Pyrg, flat-topped Steptoe | G0FL | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis robusta | Jackson Lake springsnail | Springsnail, Jackson Lake | G03W | I01 | WY; | Hydrobiidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Pyrgulopsis roswellensis | Roswell springsnail | Springsnail, Roswell | G03T | I01 | NM; U.S.A. (NM) | Hydrobiidae | Aug 09, 2005 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Pyrgulopsis sathos | White River Valley pyrg | Pyrg, White River Valley | G0FM | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis saxatilis | Sub-globose Snake pyrg | Pyrg, sub-globose Snake | G0FN | I01 | UT; | Hydrobiidae | NA | Snails | 6 | Under Review in the Candidate or Petition Process | 6 | US | I | Wherever found |
| Pyrgulopsis serrata | Northern Steptoe pyrg | Pyrg, Northern Steptoe | G0FO | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis simplex | Fossil springsnail | Springsnail, fossil | G05A | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis sola | Brown springsnail | Springsnail, brown | G05B | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis sp. | Spring Creek pyrg | Pyrg, Spring Creek | G0A4 | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Spring Creek |
| Pyrgulopsis sp. | Briley Creek pyrg | Pyrg, Briley Creek | G0A2 | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Briley Creek |
| Pyrgulopsis sp. | Flint River pyrg | Pyrg, Flint River | G0A3 | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Flint R. |
| pyrgulopsis species | mimbres springsnail | springsnail, mimbres | F04D | I01 | hydrobiidae | NA | Clams | 2 | Not Listed | NA | US | I | Wherever found | |
| Pyrgulopsis sterilis | Sterile Basin pyrg | Pyrg, Sterile Basin | G0FP | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis sublata | Lake Valley pyrg | Pyrg, Lake Valley pryg | G0FQ | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Pyrgulopsis sulcata | Southern Steptoe pyrg | Pyrg, Southern Steptoe | G0FR | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis texana | Phantom Springsnail | Springsnail, Phantom | G00X | I01 | TX; | Hydrobiidae | Aug 08, 2013 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Pyrgulopsis thermalis | New Mexico springsnail | Springsnail, New Mexico | G047 | I01 | NM; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Pyrgulopsis thompsoni | Huachuca springsnail | Springsnail, Huachuca | G05C | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Pyrgulopsis trivialis | Three Forks Springsnail | Springsnail, Three Forks | G051 | I01 | AZ; U.S.A. (AZ) | Hydrobiidae | May 17, 2012 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Pyrgulopsis turbatrix | Southeast Nevada pyrg | Pyrg, Southeast Nevada | G0FS | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Pyrgulopsis villacampae | Duckwater Warm Springs pyrg | Pyrg, Duckwater Warm Springs | G0FT | I01 | Hydrobiidae | NA | Snails | 8 | Not Listed | NA | US | I | Wherever found | |
| Pyrgulopsis wongi | Wongs springsnail | Springsnail, Wongs | G0BO | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Pyrgus centaureae | Grizzled skipper | Skipper, grizzled | I0OE | I01 | DE, KY, MD, MI, NC, NJ, NY, OH, PA, VA, WV; | Hesperiidae | NA | Insects | 5 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Pyrgus ruralis lagunae | Laguna Mountains skipper | Skipper, Laguna Mountains | I0LW | I01 | CA; U.S.A. (CA) | Hesperiidae | Jan 16, 1997 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Pyriglena atra | Fringe-backed fire-eye | Fire-eye, fringe-backed | B0D3 | V01 | Brazil | Thamnophilidae | Jan 27, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| pyrocephalus rubinus | Vermillion flycatcher | flycatcher, Vermillion | B0E8 | V01 | tyrannidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Pyrrhula pyrrhula murina | Sao Miguel bullfinch (finch) | Bullfinch, Sao Miguel (finch) | B012 | V01 | Eastern Atlantic Ocean (Azores), Portugal; Portugal (Azores) | Fringillidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pyrrhura cruentata | Blue-throated (=ochre-marked) parakeet | Parakeet, blue-throated (=ochre-marked) | B029 | V01 | Brazil | Psittacidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pyrrocoma insecticruris | No common name | No common name | Q2P7 | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pyrrocoma liatriformis | No common name | No common name | Q0XG | P01 | ID, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pyrrocoma radiata | [Unnamed] goldenweed | Goldenweed, [unnamed] | Q0XI | P01 | ID, OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Pyrrocoma uniflora gossypina | Bear Valley pyrrocoma | Pyrrocoma, Bear Valley | Q1KK | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Pyrrocoma uniflora var. uniflora | [Unnamed] goldenweed | Goldenweed, [unnamed] | Q1WV | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Pyrroglaux podargina | Palau Owl | Owl, Palau | B087 | V01 | Palau,West Pacific Ocean | Strigidae | Jun 02, 1970 | Birds | Foreign | Recovery | NA | US/Foreign | V | Wherever found |
| Python molurus molurus | Indian python | Python, Indian | C01A | V01 | Sri Lanka and India | Boidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Pyxidanthera barbulata brevifolia | Well's pixie-moss | Pixie-moss, Well's | Q210 | P01 | NC, SC; | Diapensiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Pyxis arachnoides | Spider Tortoise | Tortoise, Spider | C07H | V01 | Testudinidae | NA | Reptiles | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Pyxis planicauda | Flat-tailed tortoise | tortoise, Flat-tailed | C07I | V01 | Testudinidae | NA | Reptiles | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Quadrula asperata ssp. archeri | Tallapoosa orb | orb, Tallapoosa | F050 | I01 | AL; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Quadrula aurea | Golden orb | Orb, golden | F04J | I01 | TX; | Unionidae | NA | Clams | 2 | Candidate | 2 | US | I | Wherever found |
| Quadrula cylindrica cylindrica | Rabbitsfoot | Rabbitsfoot | F03X | I01 | AL, AR, IL, IN, KS, KY, LA, MO, MS, OH, OK, PA, TN; lower Great Lakes Subbasin and Mississippi River Basin | Unionidae | Oct 17, 2013 | Clams | 4 | Threatened | 2, 3, 4, 5, 6 | US | I | Wherever found |
| Quadrula cylindrica strigillata | Rough rabbitsfoot | Rabbitsfoot, rough | F00V | I01 | TN, VA; U.S.A. (VA, TN) | Unionidae | Jan 10, 1997 | Clams | 5 | Endangered | 4, 5 | US | I | Wherever found |
| Quadrula fragosa | Winged Mapleleaf | Mapleleaf, winged | F00C | I01 | AR, MN, MO, OK, TN, WI; Entire; except where listed as experimental populations | Unionidae | Jun 20, 1991 | Clams | 3 | Endangered | 2, 3, 4 | US | I | Wherever found, except where listed as an experimental population |
| Quadrula fragosa | Winged Mapleleaf | Mapleleaf, winged | F00C | I02 | AL; Free-Flowing Reach of the Tennessee River below the Wilson Dam, Colbert and Lauderdale Counties, AL; U.S.A. (WI, TN, OK, OH, NE, MO, MN, KY, IN, IL, IA, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL-specified portions of the Tennessee River; see 17.85(a)(1)) |
| Quadrula intermedia | Cumberland monkeyface (pearlymussel) | Monkeyface, Cumberland (pearlymussel) | F00E | I01 | AL, GA, NC, TN, VA; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Quadrula intermedia | Cumberland monkeyface (pearlymussel) | Monkeyface, Cumberland (pearlymussel) | F00E | I02 | AL; U.S.A. (VA, TN, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Quadrula intermedia | Cumberland monkeyface (pearlymussel) | Monkeyface, Cumberland (pearlymussel) | F00E | I03 | U.S.A. (VA, TN, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Quadrula petrina | Texas pimpleback | Pimpleback, Texas | F04F | I01 | TX; not yet listed | Unionidae | NA | Clams | 2 | Candidate | 2 | US | I | Wherever found |
| Quadrula sparsa | Appalachian monkeyface (pearlymussel) | Monkeyface, Appalachian (pearlymussel) | F00D | I01 | NC, TN, VA; U.S.A. (VA, TN) | Unionidae | Jun 14, 1976 | Clams | 5 | Endangered | 4, 5 | US | I | Wherever found |
| Quadrula sparsa | Appalachian monkeyface (pearlymussel) | Monkeyface, Appalachian (pearlymussel) | F00D | I02 | U.S.A. (VA, TN) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | USA (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Quadrula stapes | Stirrupshell | Stirrupshell | F027 | I01 | AL, MS; Possibly extinct, no populations have been found in recent years; U.S.A. (MS, AL) | Unionidae | Apr 07, 1987 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Quercus arkansana | [Unnamed] oak | Oak, [unnamed] | Q2HB | P01 | AL, AR, FL, GA, LA; | Fagaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Quercus berberidifolia | Scrub oak | oak, Scrub | Q3KW | P01 | Fagaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Quercus boyntonii | Boynton's oak | Oak, Boynton's | Q38G | P01 | AL, TX; | Fagaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Quercus douglasii | Blue oak | Oak, blue | Q3ID | P01 | Fagaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Quercus dumosa | Nuttall's scrub oak | Oak, Nuttall's scrub | Q3FF | P01 | CA; | Fagaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| quercus engelmannii | Engelmann oak | oak, Engelmann | Q3JQ | P01 | fagaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Quercus georgiana | [Unnamed] oak | Oak, [unnamed] | Q1KL | P01 | AL, GA, SC; | Fagaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Quercus graciliformis | Slender oak | Oak, slender | Q1KM | P01 | TX; | Fagaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Quercus hinckleyi | Hinckley oak | Oak, Hinckley | Q211 | P01 | TX; U.S.A. (TX) | Fagaceae | Aug 26, 1988 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Quercus kelloggii | California black oak | Oak, California black | Q3IE | P01 | Fagaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Quercus lobata | Valley Oak | Oak, Valley | Q3IF | P01 | Fagaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Quercus oglethorpensis | Oglethorpe oak | Oak, Oglethorpe | Q1KN | P01 | GA, LA, MS, SC; | Fagaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Quercus parvula | Santa Cruz Island oak | Oak, Santa Cruz Island | Q1KO | P01 | CA; | Fagaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Quercus shumardii acerifolia | Maple-leaf oak | Oak, maple-leaf | Q1KP | P01 | AR; | Fagaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Quercus tardifolia | Chisos Mountains oak | Oak, Chisos Mountains | Q1KQ | P01 | TX; | Fagaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Quercus tomentella | Island oak | Oak, island | Q1KR | P01 | CA; | Fagaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Quincuncina kleiniana | Suwannee Pigtoe | Pigtoe, Suwannee | F047 | I01 | Unionidae | NA | Clams | 4 | Not Listed | NA | US | I | Wherever found | |
| Quisicalus palustris | Slender-billed Grackle | Grackle, slender-billed | B01O | V01 | Mexico | Icteridae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Radiocentrum avalonense | Catalina mountainsnail | Mountainsnail, Catalina | G02F | I01 | CA; | Oreohelicidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Raillardella pringlei | Showy raillardella | Raillardella, showy | Q1KS | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Rallus elegans | King Rail | Rail, king | B0G9 | V01 | Rallidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Rallus longirostris | Clapper rail | Rail, clapper | B0GA | V01 | Rallidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Rallus longirostris insularum | Mangrove clapper rail | Rail, mangrove clapper | B07D | V01 | FL; | Rallidae | NA | Birds | 4 | Not Listed | 4 | US | V | Wherever found |
| Rallus longirostris levipes | Light-footed clapper rail | Rail, light-footed clapper | B04B | V01 | CA; U.S.A. (CA), Mexico (Baja California) | Rallidae | Oct 13, 1970 | Birds | 8 | Endangered | 8 | US/Foreign | V | Wherever found |
| Rallus longirostris obsoletus | California clapper rail | Rail, California clapper | B04A | V01 | CA; U.S.A. (CA) | Rallidae | Oct 13, 1970 | Birds | 8 | Endangered | 8 | US | V | Wherever found |
| Rallus longirostris yumanensis | Yuma clapper rail | Rail, Yuma clapper | B00P | V01 | AZ, CA; Mexico, U.S.A. (CA, AZ); Range may be expanding northward into Nevada and Utah and into Grand Canyon in Mohave County, AZ | Rallidae | Mar 11, 1967 | Birds | 2 | Endangered | 2, 8 | US/Foreign | V | Wherever found |
| Rallus owstoni | Guam rail | Rail, Guam | B063 | V01 | GU; Western Pacific Ocean-U.S.A. (Guam) | Rallidae | Apr 11, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found, except where listed as an experimental population |
| Rallus owstoni | Guam rail | Rail, Guam | B063 | V02 | MP; Rota | Rallidae | Oct 30, 1989 | Birds | 1 | Experimental Population, Non-Essential | 1 | US | V | Rota |
| Rallus pectoralis muelleri | Aukland Island rail | Rail, Aukland Island | B031 | V01 | New Zealand | Rallidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rallus poecilopterus | Barred-wing rail | Rail, barred-wing | B0CQ | V01 | Rallidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Rallus semiplumbeus | Bogota rail | Rail, Bogota | B0BW | V01 | Rallidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Ramphocinclus brachyurus | White-breasted thrasher | Thrasher, white-breasted | B03D | V01 | Martinique, Saint Lucia | Mimidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ramphodon (=Glaucis) dohrnii | Hook-billed hermit (hummingbird) | Hermit, hook-billed (hummingbird) | B054 | V01 | Brazil | Trochilidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rana | Duckwater frog | Frog, duckwater | D00R | V01 | NV; | Ranidae | NA | Amphibians | 1 | Not Listed | 8 | US | V | Wherever found |
| Rana areolata aesopus | Florida crawfish frog | Frog, Florida crawfish | D00T | V01 | FL, GA; | Ranidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Rana areolata capito | Carolina crawfish frog | Frog, Carolina crawfish | D00Q | V01 | GA, NC, SC; | Ranidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Rana areolata sevosa | Dusky crawfish frog | Frog, dusky crawfish | D00S | V01 | AL, FL, LA, MS; | Ranidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Rana aurora aurora | Northern red-legged frog | Frog, northern red-legged | D02I | V01 | CA, OR, WA; | Ranidae | NA | Amphibians | 1 | Not Listed | 1, 8 | US/Foreign | V | Wherever found |
| Rana boylii | Foothill yellow-legged frog | Frog, foothill yellow-legged | D02G | V01 | CA, OR; | Ranidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US | V | Wherever found |
| Rana cascadae | Cascades frog | Frog, Cascades | D02E | V01 | CA, OR, WA; | Ranidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 1, 8 | US | V | Wherever found |
| Rana chiricahuensis | Chiricahua leopard frog | Frog, Chiricahua leopard | D02F | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Ranidae | Jun 13, 2002 | Amphibians | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Rana draytonii | California red-legged frog | Frog, California red-legged | D02D | V01 | CA; U.S.A. (CA), Mexico | Ranidae | May 23, 1996 | Amphibians | 8 | Threatened | 8 | US/Foreign | V | Wherever found |
| Rana fisheri | Vegas Valley leopard frog | Frog, Vegas Valley leopard | D00F | V01 | AZ, NV, UT; Believed to be extinct | Ranidae | NA | Amphibians | 2 | Not Listed | 2, 6, 8 | US | V | Wherever found |
| Rana luteiventris | Columbia spotted frog | Frog, Columbia spotted | D027 | V01 | ID, NV, OR; ; Based on geographic and genetic characterization, Columbia spotted frogs in southwest Idaho, southeast Oregon, and northeast and central Nevada are part of the Great Basin population of Columbia spotted frogs (Funk et al. 2008, pp. 201-202). Funk, W.C., C.A Pearl, H.M. Draheim, M.J. Adams, T.D. Mullins, and S.M. Haig. 2008. Range-wide phylogenetic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) in northwestern North America. Molecular Phylogenetics and Evolution 49:198-210. | Ranidae | NA | Amphibians | 8 | Not Listed | 1, 8 | US/Foreign | V | Great Basin DPS |
| Rana luteiventris | Columbia spotted frog | Frog, Columbia spotted | D027 | V04 | ID, OR; | Ranidae | NA | Amphibians | 6 | Not Listed | 1 | US/Foreign | V | main pop. |
| Rana muscosa | Mountain yellow-legged frog | Frog, mountain yellow-legged | D02H | V01 | CA; U.S.A. (NV, CA) | Ranidae | Jul 02, 2002 | Amphibians | 8 | Endangered | 8 | US | V | U.S.A., southern California |
| Rana muscosa | Mountain yellow-legged frog | Frog, mountain yellow-legged | D02H | V02 | CA; | Ranidae | Jun 30, 2014 | Amphibians | 8 | Endangered | 8 | US | V | U.S.A., northern California |
| Rana okaloosae | Florida bog frog | Frog, Florida bog | D022 | V01 | FL; | Ranidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Rana pipiens | northern leopard frog | frog, northern leopard | D03D | V02 | CO; | Ranidae | NA | Amphibians | 2 | Not Listed | 6 | US | V | western United States |
| Rana pretiosa | Oregon spotted frog | Frog, Oregon spotted | D02A | V01 | CA, OR, WA; British Columbia (Canada); Fraser River (British Columbia, Canada) through portions of Puget Trough and tributaries to Columbia River on south side of Mount Adams, Washington. Eastern slope of Cascades in the Deschutes and Klamath River basins in Oregon. | Ranidae | Sep 29, 2014 | Amphibians | 1 | Threatened | 1, 8 | US | V | Wherever found |
| Rana sevosa | dusky gopher frog | Frog, dusky gopher | D031 | V01 | AL, MS; U.S.A. (MS, LA, AL) | Ranidae | Dec 04, 2001 | Amphibians | 4 | Endangered | 4 | US | V | Wherever found |
| Rana sierrae | Sierra Nevada Yellow-legged Frog | Frog, Sierra Nevada Yellow-legged | D04M | V01 | CA; | Ranidae | Jun 30, 2014 | Amphibians | 8 | Endangered | 8 | US | V | Wherever found |
| Rana subaquavocalis | Ramsey Canyon leopard frog | Frog, Ramsey Canyon leopard | D02N | V01 | AZ; | Ranidae | NA | Amphibians | 2 | Not Listed | 2 | US | V | Wherever found |
| Rana tarahumarae | Tarahumara frog | Frog, Tarahumara | D00W | V01 | AZ; | Ranidae | NA | Amphibians | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Rana yavapaiensis | Lowland leopard (=San Felipe leopard) frog | Frog, lowland leopard (=San Felipe leopard) | D023 | V01 | AZ, CA, NM, UT; | Ranidae | NA | Amphibians | 2 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Randia portoricensis | No common name | No common name | Q1KU | P01 | PR, VI; | Rubiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rangifer tarandus caribou | Woodland Caribou | Caribou, Woodland | A088 | V01 | ID, WA; Canada (S.E B.C.); U.S.A. (ID, WA), Canada (that part of S.E. British Columbia bounded by the U.S.-Can. border, Columbia R., Kootenay R., Kootenay L., and Kootenai R.) | Cervidae | Jan 14, 1983 | Mammals | 1 | Endangered | 1 | US/Foreign | V | U.S.A. (ID, WA), Canada (that part of S.E. British Columbia bounded by the U.S.-Can. border, Columbia R., Kootenay R., Kootenay L., and Kootenai R.) |
| Rangifer tarandus pearyi | Peary caribou | Caribou, Peary | A0JC | V01 | Cervidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Rangifer tarandus ssp. groenlandicus | Dolphin-Union caribou | Caribou, Dolphin-Union | A0JD | V01 | Cervidae | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Ranunculus aestivalis (=acriformis) | Autumn Buttercup | Buttercup, autumn | Q212 | P01 | UT; U.S.A. (UT) | Ranunculaceae | Jul 21, 1989 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Ranunculus austro-oreganus | No common name | No common name | Q2QR | P01 | OR; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ranunculus fascicularis cuneiformis | Kerr crowfoot | Crowfoot, Kerr | Q1KV | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ranunculus hawaiensis | Makou | Makou | Q38H | P01 | HI; | Ranunculaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Ranunculus inamoenus subaffinis | [Unnamed] buttercup | Buttercup, [unnamed] | Q1KW | P01 | AZ; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Ranunculus laxicaulis | Bladen buttercup | Buttercup, Bladen | Q1KY | P01 | NC; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ranunculus mauiensis | Makou | Makou | Q2VQ | P01 | HI; | Ranunculaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Ranunculus occidentalis nelsonii | No common name | No common name | Q2HD | P01 | AK; | Ranunculaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Ranunculus triternatus | No common name | No common name | Q1KX | P01 | WA; | Ranunculaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia helleri | No common name | No common name | Q1KZ | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia mauiensis | No common name | No common name | Q1L0 | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia molokaiensis parvifolia | No common name | No common name | Q1L1 | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia remotiflora | Wahaula heiau | Wahaula heiau | Q1L2 | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia sandwicensis sandwicensis | Hao | Hao | Q1L3 | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rauvolfia sandwicensis subacuminata | No common name | No common name | Q1L4 | P01 | HI; | Apocynaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Ravenia urbanii | Prieto tortugo | Tortugo, prieto | Q1L5 | P01 | PR, VI; | Rutaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rayjacksonia aurea | Houston tansyaster | Tansyaster, Houston | Q16K | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Regina septemvittata | Queen snake | Snake, queen | C060 | V01 | AR, MO; | Colubridae | NA | Reptiles | 4 | Not Listed | 3, 4 | US | V | Wherever found |
| Reithrodontomys megalotis arizonensis | Chiricahua western harvest mouse | Mouse, Chiricahua western harvest | A0BR | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Reithrodontomys megalotis limicola | Southern marsh harvest mouse | Mouse, southern marsh harvest | A0CA | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Reithrodontomys megalotis ravus | Stansbury Island harvest mouse | Mouse, Stansbury Island harvest | A0CC | V01 | UT; | Muridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Reithrodontomys megalotis santacruzae | Santa Cruz harvest mouse | Mouse, Santa Cruz harvest | A0C8 | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Reithrodontomys raviventris | Salt marsh harvest mouse | Mouse, salt marsh harvest | A03Y | V01 | CA; U.S.A.(CA) | Cricetidae | Oct 13, 1970 | Mammals | 8 | Endangered | 8 | US | V | wherever found |
| Relictus solitarius | Relict dace | Dace, relict | E03H | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Remenus kirchneri | Blueridge springfly | springfly, Blueridge | I0X0 | I01 | VA; | Perlodidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Remya kauaiensis | No common name | No common name | Q213 | P01 | HI; U.S.A. (HI) | Asteraceae | Jan 14, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Remya mauiensis | Maui remya | Remya, Maui | Q214 | P01 | HI; ; U.S.A. (HI) | Asteraceae | Jan 14, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Remya montgomeryi | No common name | No common name | Q2YH | P01 | HI; U.S.A. (HI) | Asteraceae | Jan 14, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Reynoldsia sandwicensis | `Ohe | `Ohe | Q1L6 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| rhadine austinica | No common name | No common name | I0UL | I01 | carabidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Rhadine exilis | [no common name] Beetle | Beetle, [no common name] | I0RF | I01 | TX; U.S.A. (TX) | Carabidae | Dec 26, 2000 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| Rhadine infernalis | [no common name] Beetle | Beetle, [no common name] | I0P1 | I01 | TX; U.S.A. (TX) | Carabidae | Dec 26, 2000 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| rhadine insolita | No common name | No common name | I0UM | I01 | carabidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| rhadine noctivaga | No common name | No common name | I0UN | I01 | carabidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Rhadine ozarkensis | [Unnamed] ground beetle | Ground beetle, [unnamed] | I0LM | I01 | AR; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Rhadine persephone | Tooth Cave ground beetle | Beetle, Tooth Cave ground | I0IB | I01 | TX; U.S.A. (TX) | Carabidae | Sep 16, 1988 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| rhadine russelli | No common name | No common name | I0UO | I01 | carabidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Rhaphiomidas terminatus abdominalis | Delhi Sands flower-loving fly | Fly, Delhi Sands flower-loving | I0MG | I01 | CA; U.S.A. (CA) | Mydidae | Sep 23, 1993 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Rhaphiomidas terminatus terminatus | El Segundo flower-loving fly | Fly, El Segundo flower-loving | I0NE | I01 | CA; Believed to be extinct | Apioceridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhaphiomidas trochilus | San Joaquin Valley giant flower-loving fly | fly, San Joaquin Valley giant flower-loving | I0RJ | I01 | CA; Believed to be extinct | Apioceridae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhapidophyllum hystrix | Needle palm | Palm, needle | Q1L7 | P01 | AL, FL, GA, MS, SC; | Arecaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhea (=Pterocnemia) pennata | Lesser rhea (incl. Darwin's) | Rhea, lesser (incl. Darwin's) | B032 | V01 | Uruguay, Peru, Bolivia, Argentina | Rheidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhexia aristosa | Awned meadowbeauty | Meadowbeauty, awned | Q2QS | P01 | AL, DE, GA, NC, NJ, SC; | Melastomataceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Rhexia parviflora | White meadowbeauty | meadowbeauty, White | Q1L8 | P01 | FL; | Melastomataceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Rhexia salicifolia | Panhandle meadowbeauty | Meadowbeauty, panhandle | Q1L9 | P01 | FL, GA; | Melastomataceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Rhinanthus arcticus | No common name | No common name | Q2HE | P01 | AK; | Scrophulariaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Rhinichthys cataractae ssp. | Millicoma dace | Dace, Millicoma | E08U | V01 | OR; | Cyprinidae | NA | Fishes | 1 | Not Listed | 1 | US | V | Wherever found |
| Rhinichthys deaconi | Las Vegas dace | Dace, Las Vegas | E09U | V01 | NV; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Rhinichthys osculus lethoporus | Independence Valley speckled dace | Dace, Independence Valley speckled | E03E | V01 | NV; U.S.A. (NV) | Cyprinidae | Oct 10, 1989 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Rhinichthys osculus moapae | Moapa speckled dace | Dace, Moapa speckled | E03F | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Rhinichthys osculus nevadensis | Ash Meadows speckled dace | Dace, Ash Meadows speckled | E03A | V01 | NV; U.S.A. (NV) | Cyprinidae | May 10, 1982 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Rhinichthys osculus oligoporus | Clover Valley speckled dace | Dace, Clover Valley speckled | E03B | V01 | NV; U.S.A. (NV) | Cyprinidae | Oct 10, 1989 | Fishes | 8 | Endangered | 8 | US | V | Wherever found |
| Rhinichthys osculus reliquus | Grass Valley speckled dace | Dace, Grass Valley speckled | E09V | V01 | NV; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Wherever found |
| Rhinichthys osculus ssp. | Speckled dace | Dace, speckled | E08Z | V01 | AZ; | Cyprinidae | NA | Fishes | 2 | Not Listed | 2 | US | V | Gila & Bill Williams |
| Rhinichthys osculus ssp. | Diamond Valley speckled dace | Dace, Diamond Valley speckled | E08Q | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Diamond Valley |
| Rhinichthys osculus ssp. | Long Valley speckled dace | Dace, Long Valley speckled | E08R | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Long Valley |
| Rhinichthys osculus ssp. | Santa Ana speckled dace | Dace, Santa Ana speckled | E08Y | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Santa Ana |
| Rhinichthys osculus ssp. | Meadow Valley Wash speckled dace | Dace, Meadow Valley Wash speckled | E08T | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Meadow Valley |
| Rhinichthys osculus ssp. | Amargosa Canyon speckled dace | Dace, Amargosa Canyon speckled | E08O | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Amargosa Canyon |
| Rhinichthys osculus ssp. | Little Lake speckled dace | Dace, Little Lake speckled | E09W | V01 | CA; Believed to be extinct | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Little Lake |
| Rhinichthys osculus ssp. | Oasis Valley speckled dace | Dace, Oasis Valley speckled | E08W | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Oasis Valley |
| Rhinichthys osculus ssp. | White River speckled dace | Dace, White River speckled | E090 | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | White River |
| Rhinichthys osculus ssp. | Foskett speckled dace | Dace, Foskett speckled | E03D | V01 | OR; U.S.A. (OR) | Cyprinidae | Mar 28, 1985 | Fishes | 1 | Threatened | 1 | US | V | Wherever found |
| Rhinichthys osculus ssp. | Benton Valley speckled dace | Dace, Benton Valley speckled | E08P | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Benton Valley |
| Rhinichthys osculus ssp. | Monitor Valley speckled dace | Dace, Monitor Valley speckled | E08V | V01 | NV; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Monitor Valley |
| Rhinichthys osculus ssp. | Owens speckled dace | Dace, Owens speckled | E08X | V01 | CA; | Cyprinidae | NA | Fishes | 1 | Not Listed | 8 | US | V | Owens |
| Rhinichthys osculus thermalis | Kendall Warm Springs dace | Dace, Kendall Warm Springs | E00S | V01 | WY; U.S.A. (WY) | Cyprinidae | Oct 13, 1970 | Fishes | 6 | Endangered | 6 | US | V | Wherever found |
| Rhinichthys osculus velifer | Pahranagat speckled dace | Dace, Pahranagat speckled | E03G | V01 | NV; | Cyprinidae | NA | Fishes | 8 | Not Listed | 8 | US | V | Wherever found |
| Rhinoceros sondaicus | Javan rhinoceros | Rhinoceros, Javan | A024 | V01 | Bangladesh,Myanmar,Indochina,Indonesia,Malaysia,India (Sikkim),Thailand | Rhinocerotidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Sikkim, Thailand, Malaysia, Indonesia, Indochina, Burma, Bangladesh |
| Rhinoceros unicornis | Great Indian rhinoceros | Rhinoceros, great Indian | A03M | V01 | Nepal, India | Rhinocerotidae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Nepal, India |
| rhinocheilus lecontei ssp. lecontei | Western long-nosed snake | snake, Western long-nosed | C06Q | V01 | colubridae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Rhinoiophus hilli | Hill's Horseshoe Bat | Bat, Hill's Horseshoe | A0JP | V01 | RHINOLOPHIDAE | NA | Mammals | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Rhinopithecus avunculus | Tonkin snub-nosed monkey | Monkey, Tonkin snub-nosed | A0FY | V01 | Vietnam | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhinopithecus bieti | Yunnan snub-nosed monkey | monkey, Yunnan snub-nosed | A0FZ | V01 | China | Cercopithecidae | Sep 27, 1990 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhinopithecus brelichi | Guizhou snub-nosed monkey | monkey, Guizhou snub-nosed | A0FW | V01 | China | Cercopithecidae | Sep 27, 1990 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhinopithecus roxellana | Sichuan snub-nosed monkey | Monkey, Sichuan snub-nosed | A0FX | V01 | China | Cercopithecidae | Sep 27, 1990 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhinoptilus bitorquatus | Jerdon's courser | Courser, Jerdon's | B0BU | V01 | India | Glareolidae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhipidura lepida | Palau fantail flycatcher | Flycatcher, Palau fantail | B086 | V01 | Palau,West Pacific Ocean | Muscicapidae | Jun 02, 1970 | Birds | Foreign | Recovery | NA | US/Foreign | V | Wherever found |
| Rhipidura rufifrons uraniae | Guam rufous-fronted fantail | Fantail, Guam rufous-fronted | B081 | V01 | GU; Believed to be extinct | Rhipiduridae | NA | Birds | 1 | Not Listed | 1 | US | V | Wherever found |
| Rhipsalis baccifera | No common name | No common name | Q2HF | P01 | FL; Mexico,Sri Lanka,Africa,Central America,South America,West Indies | Cactaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhodacme elatior | Domed ancylid | Ancylid, domed | G05T | I01 | AL; | Ancylidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Rhodacme filosa | Wicker ancylid | Ancylid, wicker | G05U | I01 | AL; | Ancylidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Rhodiola integrifolia ssp. leedyi | Leedy's roseroot | roseroot, Leedy's | Q392 | P01 | MN, NY, SD; ; U.S.A. (NY, MN) | Crassulaceae | Apr 22, 1992 | Flowering Plants | 3 | Threatened | 3, 5, 6 | US | P | Wherever found |
| Rhododendron austrinum | [Unnamed] rhododendron | Rhododendron, [unnamed] | Q1LA | P01 | AL, FL, GA, MS; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhododendron bakeri | Baker's rhododendron | Rhododendron, Baker's | Q1LB | P01 | AL, GA, KY, NC, TN, VA; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Rhododendron chapmanii | Chapman rhododendron | Rhododendron, Chapman | Q215 | P01 | FL; U.S.A. (FL) | Ericaceae | May 23, 1979 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Rhododendron prunifolium | Plumleaf azalea | Azalea, plumleaf | Q1LC | P01 | AL, GA; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhododendron vaseyi | Pink-shell azalea | Azalea, pink-shell | Q1LD | P01 | NC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhododon ciliatus | No common name | No common name | Q2HG | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rhodonessa caryophyllacea | Pink-headed duck | Duck, pink-headed | B04X | V01 | India | Anatidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rhus kearneyi | Kearney's sumac | Sumac, Kearney's | Q1LE | P01 | AZ; | Anacardiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rhus michauxii | Michaux's sumac | Sumac, Michaux's | Q2HH | P01 | GA, NC, SC, VA; U.S.A. (VA, SC, NC, GA) | Anacardiaceae | Sep 28, 1989 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Rhus trilobata arenaria | [Unnamed] sumac | Sumac, [unnamed] | Q2VR | P01 | IL, IN, OH; | Anacardiaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Rhyacophila alexanderi | Alexander's rhyacophilan caddisfly | Caddisfly, Alexander's rhyacophilan | I038 | I01 | MT; | Rhyacophilidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Rhyacophila amabilis | Castle Lake rhyacophilan caddisfly | Caddisfly, Castle Lake rhyacophilan | I03J | I01 | CA; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhyacophila colonus | Obrien rhyacophilan caddisfly | Caddisfly, Obrien rhyacophilan | I045 | I01 | OR; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyacophila fenderi | Fender's rhyacophilan caddisfly | Caddisfly, Fender's rhyacophilan | I03N | I01 | OR; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyacophila haddocki | Haddock's rhyacophilan caddisfly | Caddisfly, Haddock's rhyacophilan | I03U | I01 | OR; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyacophila lineata | Castle Crags rhyacophilan caddisfly | Caddisfly, Castle Crags rhyacophilan | I03I | I01 | CA; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhyacophila mosana | Bilobed rhyacophilan caddisfly | Caddisfly, Bilobed rhyacophilan | I03C | I01 | CA; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhyacophila spinata | Spiny rhyacophilan caddisfly | Caddisfly, spiny rhyacophilan | I04C | I01 | CA; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Rhyacophila unipunctata | One-spot rhyacophilan caddisfly | Caddisfly, one-spot rhyacophilan | I046 | I01 | OR; | Rhyacophilidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyacotriton cascadae | Cascade torrent salamander | salamander, Cascade torrent | D03E | V01 | rhyacotritonidae | NA | Amphibians | 6 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Rhyacotriton kezeri | Columbia torrent salamander | salamander, Columbia torrent | D03M | V01 | Rhyacotritonidae | NA | Amphibians | 6 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Rhyacotriton olympicus | Olympic torrent salamander | Salamander, Olympic torrent | D035 | V01 | Rhyacotriton | NA | Amphibians | 1 | Not Listed | NA | US | V | Wherever found | |
| Rhyacotriton variegatus | Southern torrent salamander | Salamander, southern torrent | D02Y | V01 | CA, OR; | Ambystomatidae | NA | Amphibians | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Rhynchopsitta pachyrhyncha | Thick-billed parrot | Parrot, thick-billed | B00W | V01 | U.S.A. (NM, AZ), Mexico | Psittacidae | Jun 02, 1970 | Birds | 2 | Endangered | NA | US/Foreign | V | Wherever found |
| Rhynchosia cinerea | No common name | No common name | Q1LF | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhynchospora californica | California beaked-rush | Beaked-rush, California | Q1LG | P01 | CA; | Cyperaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Rhynchospora crinipes | Hairy-peduncled beaked-rush | Beaked-rush, hairy-peduncled | Q1LH | P01 | AL, FL, GA; | Cyperaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Rhynchospora culixa | [Unnamed] beaked-rush | Beaked-rush, [unnamed] | Q1LI | P01 | GA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhynchospora decurrens | [Unnamed] beaked-rush | Beaked-rush, [unnamed] | Q38I | P01 | FL, GA, NC; Possibly extinct | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhynchospora globularis saxicola | [Unnamed] beaked-rush | Beaked-rush, [unnamed] | Q1LK | P01 | GA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhynchospora knieskernii | Knieskern's Beaked-rush | Beaked-rush, Knieskern's | Q216 | P01 | NJ; U.S.A. (NJ, DE) | Cyperaceae | Jul 18, 1991 | Flowering Plants | 5 | Threatened | 5 | US | P | Wherever found |
| Rhynchospora punctata | [Unnamed] beaked-rush | Beaked-rush, [unnamed] | Q1LJ | P01 | FL, GA; Possibly extinct | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rhynchospora thornei | Thorne's beaked-rush | Beaked-rush, Thorne's | Q3FG | P01 | FL, GA, NC, SC; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Rhyncogonus biformis | Necker rhyncogonus weevil | Weevil, Necker rhyncogonus | I0G1 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus blackburni | Blackburn's rhyncogonus weevil | Weevil, Blackburn's rhyncogonus | I0FG | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus bryani | Laysan rhyncogonus weevil | Weevil, Laysan rhyncogonus | I0FV | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus exsul | Nihoa rhyncogonus weevil | Weevil, Nihoa rhyncogonus | I0G4 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus freycinetiae | Le`ie rhyncogonus weevil | Weevil, le`ie rhyncogonus | I0FW | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus giffardi | Giffard's rhyncogonus weevil | Weevil, Giffard's rhyncogonus | I0FM | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus koebelei | Koebele's rhyncogonus weevil | Weevil, Koebele's rhyncogonus | I0FQ | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus lahainae | Lahaina rhyncogonus weevil | Weevil, Lahaina rhyncogonus | I0FR | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus lanaiensis | Lanai rhyncogonus weevil | Weevil, Lanai rhyncogonus | I0FS | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus molokaiensis | Molokai rhyncogonus weevil | Weevil, Molokai rhyncogonus | I0FX | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus mutatus | Mutated rhyncogonus weevil | Weevil, mutated rhyncogonus | I0FZ | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus obsoletus | Obsolete rhyncogonus weevil | Weevil, obsolete rhyncogonus | I0G9 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus oleae | Olopua rhyncogonus weevil | Weevil, Olopua rhyncogonus | I0GA | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus segnis fordi | Ford's rhyncogonus weevil | Weevil, Ford's rhyncogonus | I0FK | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus segnis segnis | Slow rhyncogonus weevil | Weevil, slow rhyncogonus | I0GF | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus sharpi | Sharp's rhyncogonus weevil | Weevil, Sharp's rhyncogonus | I0GD | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus simplex | Simple rhyncogonus weevil | Weevil, simple rhyncogonus | I0GE | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus squamiger | Scaly rhyncogonus weevil | Weevil, scaly rhyncogonus | I0GC | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus stygius | Black rhyncogonus weevil | Weevil, black rhyncogonus | I0FH | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus sylvicola | Kauai forest rhyncogonus weevil | Weevil, Kauai forest rhyncogonus | I0FP | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus tuberculatus | Tubercled rhyncogonus weevil | Weevil, tubercled rhyncogonus | I0GH | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus vittatus | Striped rhyncogonus weevil | Weevil, striped rhyncogonus | I0GG | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhyncogonus welchii | Welch's rhyncogonus weevil | Weevil, Welch's rhyncogonus | I0GJ | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Rhynochetos jubatus | Kagu | Kagu | B01V | V01 | South Pacific Ocean-New Caledonia | Rhynochetidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ribes canthariforme | Moreno currant | Currant, Moreno | Q1LM | P01 | CA; | Grossulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ribes divaricatum parishii | Parish's gooseberry | Gooseberry, Parish's | Q38J | P01 | CA; | Grossulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ribes echinellum | Miccosukee gooseberry | Gooseberry, Miccosukee | Q217 | P01 | FL, SC; U.S.A. (SC, FL) | Saxifragaceae | Jul 18, 1985 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Ribes thacherianum | Santa Cruz gooseberry | Gooseberry, Santa Cruz | Q3FH | P01 | CA; | Grossulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Ribes tularensis | Sequoia gooseberry | Gooseberry, Sequoia | Q38K | P01 | CA; | Grossulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Rinodina brodoana | Ernie''s mountain treasure | treasure, Ernie''s mountain | U013 | P01 | NC; | Physciaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Rinodina chrysomelaena | Muhlenberg''s smile | smile, Muhlenberg''s | U014 | P01 | NC; | Physciaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| riparia riparia | Bank swallow | swallow, Bank | B0EW | V01 | hirundinidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Rissa brevirostris | Red-legged kittiwake | Kittiwake, red-legged | B0AO | V01 | AK; | Laridae | NA | Birds | 7 | Not Listed | 7 | US | V | Wherever found |
| Robinia hartwigii | Hartweg's Locust | Locust, Hartweg's | Q3SO | P01 | NC; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Rollandia angustifolia ochreata | No common name | No common name | Q1LN | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rollandia degenerana | No common name | No common name | Q1LO | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Romanzoffia thompsonii | No common name | No common name | Q2HI | P01 | OR; | Hydrophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Romerolagus diazi | Volcano rabbit | Rabbit, volcano | A023 | V01 | Mexico | Leporidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Mexico |
| romneya coulteri | Coulter's matilija poppy | poppy, Coulter's matilija | Q3JR | P01 | papaveraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Rorippa aquatica | No common name | No common name | Q2YZ | P01 | IL, IN, KY, LA, MI, MO, NC, NY, OH, OK, SC, TN, VA, VT, WI; | Brassicaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4, 5 | US | P | Wherever found |
| Rorippa calycina | No common name | No common name | Q1LT | P01 | MT, ND, WY; Canada (N.W.T.) | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US/Foreign | P | Wherever found |
| Rorippa coloradensis | San Luis watercress | Watercress, San Luis | Q1LU | P01 | CO; Possibly extinct | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Rorippa columbiae | Columbia yellow-cress | Yellow-cress, Columbia | Q1LV | P01 | CA, OR, WA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Rorippa gambellii | Gambel's watercress | Watercress, Gambel's | Q38L | P01 | CA; U.S.A. (CA) | Brassicaceae | Aug 03, 1993 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Rorippa subumbellata | Tahoe yellow cress | Cress, Tahoe yellow | Q1LW | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Rosa minutifolia | Small-leaved rose | Rose, small-leaved | Q3FI | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Rosa stellata abyssa | Grand Canyon rose | Rose, Grand Canyon | Q1LX | P01 | AZ; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rosa stellata stellata | No common name | No common name | Q1LY | P01 | NM, TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rostrhamus sociabilis plumbeus | Everglade snail kite | Kite, Everglade snail | B00F | V01 | FL; U.S.A. (FL), Cuba | Accipitridae | Mar 11, 1967 | Birds | 4 | Endangered | 4 | US/Foreign | V | Wherever found |
| Roystonea elata | Royal, Florida palm | Palm, royal, Florida | Q1LZ | P01 | FL; | Arecaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rubus bartonianus | No common name | No common name | Q2VS | P01 | ID, OR; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rubus glaucifolius ganderi | Cuyamaca raspberry | Raspberry, Cuyamaca | Q2HJ | P01 | CA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Rubus macraei | No common name | No common name | Q38M | P01 | HI; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rubus missouricus | No common name | No common name | Q2HK | P01 | IL, MI, MO; | Rosaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Rubus nigerrimus | No common name | No common name | Q2HL | P01 | WA; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Rubus trivialis | [Unnamed] dewberry | Dewberry, [unnamed] | Q218 | P01 | TX; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rubus whartoniae | Wharton's dewberry | Dewberry, Wharton's | Q2QT | P01 | DE, KY, PA, TN; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Rudbeckia auriculata | Eared coneflower | coneflower, Eared | Q1M0 | P01 | AL, FL, GA; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Rudbeckia heliopsidis | Sunfacing coneflower | coneflower, Sunfacing | Q1M1 | P01 | GA, SC, VA; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | P | Wherever found |
| Rudbeckia nitida nitida | Yellow coneflower | Coneflower, yellow | Q2HM | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rudbeckia scabrifolia | Bog coneflower | Coneflower, bog | Q38N | P01 | LA, TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Rudbeckia triloba var. pinnatiloba | pinnately-lobed brown-eyed susan | brown-eyed susan, pinnately-lobed | Q2HN | P01 | Asteraceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Ruellia drummondiana | No common name | No common name | Q2HO | P01 | TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rugelia nudicaulis | Rugel''s Ragwort | Ragwort, Rugel''s | Q09Q | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rukia longirostra | Ponape greater white-eye | White-eye, Ponape greater | B03N | V01 | FM; Caroline Islands (FSM),Western Pacific | Zosteropidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Rukia ruki | Truk greater white-eye | White-eye, Truk greater | B06M | V01 | FM; Caroline Islands (FSM) | Zosteropidae | NA | Birds | Foreign | Pre-Act Delisting (or clearance--removal from the Lists) | NA | Foreign | V | Wherever found |
| Rumex krausei | [Unnamed] sorrel | Sorrel, [unnamed] | Q38O | P01 | AK; U.S.S.R | Polygonaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Rumex orthoneurus | Chiricahua dock | Dock, Chiricahua | Q1M2 | P01 | AZ, NM; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rumex spiralis | No common name | No common name | Q2HP | P01 | TX; | Polygonaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Rupicapra rupicapra ornata | Apennine chamois | Chamois, Apennine | A051 | V01 | Entire | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ruppia anomala | Yerba de zanja | Yerba de zanja | Q1M3 | P01 | PR, VI; | Ruppiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Rynchops niger | Black Skimmer | Skimmer, Black | B0EO | V01 | Laridae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Sabal etonia | Miami palmetto | Palmetto, Miami | Q2YB | P01 | FL; | Arecaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sageretia minutiflora | No common name | No common name | Q1M4 | P01 | AL, FL, GA, MS, SC; | Rhamnaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sagittaria fasciculata | Bunched arrowhead | Arrowhead, bunched | Q219 | P01 | NC, SC; U.S.A. (SC, NC) | Alismataceae | Aug 31, 1979 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Sagittaria sanfordii | Valley sagittaria | Sagittaria, valley | Q2HQ | P01 | CA; | Alismataceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sagittaria secundifolia | Kral's water-plantain | Water-plantain, Kral's | Q2VT | P01 | AL, GA; U.S.A. (GA, AL) | Alismataceae | Apr 13, 1990 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Saguinus bicolor | Pied tamarin | Tamarin, pied | A06Y | V01 | Northern Brazil | Callithricidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Saguinus leucopus | White-footed tamarin | Tamarin, white-footed | A06Z | V01 | Colombia | Callithricidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Saguinus oedipus | Cotton-top tamarin | Tamarin, cotton-top | A06Q | V01 | Costa Rica to Colombia | Callithricidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Saicella smithi | Smith's siacellan reduviid | Reduviid, Smith's siacellan | I0C4 | I01 | HI; | Reduviidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Saiga tatarica mongolica | Mongolian saiga (antelope) | Saiga, Mongolian (antelope) | A063 | V01 | Mongolia | Bovidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Mongolia |
| Saimiri oerstedii | Red-backed squirrel monkey | Monkey, red-backed squirrel | A01S | V01 | Panama,Costa Rica | Cebidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sairocarpus subcordatus | Dimorphic snapdragon | Snapdragon, dimorphic | Q025 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Saldula usingeri | Wilbur Springs shore bug | Bug, Wilbur Springs shore | I01P | I01 | CA; | Saldidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Salix amygdaloides | Peach-leaved willow | Willow, peach-leaved | Q3IH | P01 | Salicaceae | NA | Flowering Plants | NA | Not Listed | NA | P | Wherever found | ||
| Salix arizonica | Arizona willow | Willow, Arizona | Q1M5 | P01 | AZ; | Salicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Salix floridana | Florida willow | Willow, Florida | Q1M6 | P01 | FL; | Salicaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Salix fluviatilis | [Unnamed] willow | Willow, [unnamed] | Q1M7 | P01 | OR, WA; | Salicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Salix interior exterior | Sandbar, inside-outside willow | Willow, sandbar, inside-outside | Q2VU | P01 | ME, PA; | Salicaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Salix ovalifolia glacialis | Round-leaf willow | Willow, round-leaf | Q2HR | P01 | AK; | Salicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Salmo platycephalus | Ala balik (trout) | Ala balik (trout) | E00I | V01 | Turkey | Salmonidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Salmo salar | Atlantic salmon | Salmon, Atlantic | E07L | V01 | ME; | Salmonidae | Nov 17, 2000 | Fishes | 5 | Not Listed | 5 | US | V | U.S.A. ME Gulf of Maine Atlantic Salmon Distinct Population Segment, which includes all naturally reproducing wild populations and those river-specific hatchery populations of Atlantic salmon having historical, river-specific characteristics found north of and including tributaries of the lower Kennebec River to, but not including, the mouth of the St. Croix River at the U.S.-Canda border. To date, the Services have determined that these populations are found in the Dennys, East Machias, Machias, Pleasant, Narraguagus, Sheepscot, and Ducktrap Rivers and in Cove Brook, Maine |
| Salmo salar | Atlantic salmon | Salmon, Atlantic | E07L | V02 | Salmonidae | Jun 19, 2009 | Fishes | 5 | Not Listed | NA | US | V | Kennebec River DPS | |
| Salmo salar | Atlantic salmon | Salmon, Atlantic | E07L | V03 | ME; U.S.A., Canada, Greenland, western Europe | Salmonidae | Jun 19, 2009 | Fishes | 5 | Endangered | 5 | US | V | Gulf of Maine DPS - See 50 CFR 224.101 |
| Salvadora hexalepis virgultea | Coast patch-nosed snake | Snake, coast patch-nosed | C05F | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Salvelinus agassizii | Silver trout | Trout, silver | E09X | V01 | NH; Believed to be extinct | Salmonidae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Salvelinus confluentus | Bull Trout | Trout, bull | E065 | V06 | ID, MT, NV, OR, WA; U.S.A., coterminous (lower 48 states), except where listed as an experimental population | Salmonidae | Jun 10, 1998 | Fishes | 1 | Threatened | 1, 6, 8 | US | V | U.S.A., conterminous, (lower 48 states) |
| Salvelinus confluentus | Bull Trout | Trout, bull | E065 | V07 | U.S.A. (AK, Pacific NW into CA, ID, NV, MT), Canada (NW Territories) | Salmonidae | Dec 09, 2009 | Fishes | 1 | Experimental Population, Non-Essential | NA | US | V | Clackamas River subbasin and the mainstem Willamette River, from Willamette Falls to its points of confluence with the Columbia River, including Multnomah Channel |
| Salvelinus fontinalis | brook trout | trout, brook | E0AL | V01 | CT, DE, GA, IN, MA, MD, ME, MI, MN, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VT, WI, WV; | Salmonidae | NA | Fishes | 3 | Not Listed | 3, 4, 5 | US | V | anadromous (lake-run) |
| Salvelinus malma | Dolly Varden | Dolly Varden | E09Z | V01 | WA; | Salmonidae | NA | Fishes | 1 | Proposed Similarity of Appearance to a Threatened Taxon | 1 | US | V | Wherever found |
| Salvia amissa | Aravaipa sage | Sage, Aravaipa | Q3FJ | P01 | AZ; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Salvia brandegeei | Brandegee's sage | Sage, Brandegee's | Q2HS | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia columbariae ziegleri | San Jacinto Mountains chia | Chia, San Jacinto Mountains | Q1MA | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia dorrii clokeyi | No common name | No common name | Q38P | P01 | NV; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia dorrii mearnsii | Verde Valley sage | Sage, Verde Valley | Q3FK | P01 | AZ; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Salvia eremostachya | Desert sage | Sage, desert | Q2HT | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia funerea | Death Valley sage | Sage, Death Valley | Q2HU | P01 | CA, NV; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia greatai | Orocopia sage | Sage, Orocopia | Q2HV | P01 | CA; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Salvia micrantha var. blodgettii | Blodgett's sage | Sage, Blodgett's | Q1M9 | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Salvia penstemonoides | Big red sage | Sage, big red | Q1MB | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Wherever found |
| Samoana conica | Samoana tree snail | Snail, Samoana tree | G0BI | I01 | AS; | Partulidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Samoana fragilis | Fragile tree snail | Snail, fragile tree | G0A7 | I01 | GU, MP; | Partulidae | Nov 02, 2015 | Snails | 1 | Endangered | 1 | US | I | Wherever found |
| Samoana thurstoni | Ofu tree snail | Snail, Ofu tree | G0BH | I01 | AS; | Partulidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Sanicula arctopoides | Footsteps of spring | Footsteps of spring | Q3KJ | P01 | Apiaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Sanicula hoffmannii | Hoffman's sanicle | Sanicle, Hoffman's | Q1MC | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sanicula kauaiensis | No common name | No common name | Q38Q | P01 | HI; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sanicula maritima | Adobe sanicle | Sanicle, adobe | Q1MD | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sanicula mariversa | No common name | No common name | Q38R | P01 | HI; U.S.A. (HI) | Apiaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sanicula peckiana | Peck's sanicle | Sanicle, Peck's | Q1ME | P01 | CA, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sanicula purpurea | No common name | No common name | Q1MF | P01 | HI; U.S.A. (HI) | Apiaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sanicula sandwicensis | No common name | No common name | Q2HW | P01 | HI; ; Currently, one population of individuals is scattered on the slopes of Haleakala on the island of Maui (Plant Extinction Prevention Program (PEPP) 2011, p. 162; PEPP 2014, in litt.). This species has not recently been observed on the island of Hawaii. | Apiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sanicula saxatilis | Rock sanicle | Sanicle, rock | Q1MG | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sanicula tracyi | Tracy's sanicle | Sanicle, Tracy's | Q1MH | P01 | CA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Santalum ellipticum littorale | No common name | No common name | Q1MI | P01 | HI; | Santalaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Santalum haleakalae var. lanaiense | Lanai sandalwood (=`iliahi) | Sandalwood, Lanai (=`iliahi) | Q2HX | P01 | HI; U.S.A. (HI) | Santalaceae | Jan 24, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Santalum involutum | No common name | No common name | Q3OO | P01 | HI; ; Current Range Distribution: Santalum involutum is currently known from small isolated forest pockets in Pohakuao and Kalalau valleys in the mesic and wet ecosystems in the Na Pali-Kona Forest Reserve on the northern side of Kauai (Harbaugh et al. 2010, pp. 827−838). | Santalaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Santalum salicifolium | No common name | No common name | Q21A | P01 | HI; | Santalaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Santessoniella crossophylla | Old gray cross-lobes | -lobes,Old gray cross | U015 | P01 | NC; | Pannariaceae | NA | Lichens | 4 | Not Listed | 4 | US | P | |
| Sarracenia leucophylla | [Unnamed] pitcher-plant | Pitcher-plant, [unnamed] | Q38S | P01 | FL; | Sarraceniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sarracenia oreophila | Green pitcher-plant | Pitcher-plant, green | Q21B | P01 | AL, GA, NC; U.S.A. (TN, NC, GA, AL) | Sarraceniaceae | Oct 21, 1979 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Sarracenia psittacina | Parrot pitcher-plant | Pitcher-plant, parrot | Q2HY | P01 | AL, FL, GA, LA, MS; | Sarraceniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sarracenia purpurea var. montana | Mountain Purple pitcherplant | pitcherplant, Mountain Purple | Q3PL | P01 | GA, NC, SC; | Sarraceniaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Sarracenia rubra rubra | Sweet, red-flowered pitcher-plant | Pitcher-plant, sweet, red-flowered | Q2I1 | P01 | FL, GA, MS, NC, SC; | Sarraceniaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sarracenia rubra ssp. alabamensis | Alabama canebrake pitcher-plant | Pitcher-plant, Alabama canebrake | Q2HZ | P01 | AL; U.S.A. (AL) | Sarraceniaceae | Mar 10, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Sarracenia rubra ssp. gulfensis | Gulf Sweet pitcherplant | pitcherplant, Gulf Sweet | Q3PM | P01 | FL, GA; | Sarraceniaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Sarracenia rubra ssp. jonesii | Mountain sweet pitcher-plant | Pitcher-plant, mountain sweet | Q2I0 | P01 | NC, SC; U.S.A. (SC, NC) | Sarraceniaceae | Sep 30, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Sarracenia rubra ssp. wherryi | Wherry's Sweet pitcher-plant | pitcher-plant, Wherry's Sweet | Q1MJ | P01 | AL, FL, MS; | Sarraceniaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Satan eurystomus | Widemouth blindcat | Blindcat, widemouth | E02F | V01 | TX; | Ictaluridae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Satyrium auretorum fumosum | Santa Monica Mountains hairstreak | Hairstreak, Santa Monica Mountains | I0NK | I01 | CA; | Lycaenidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Satyrodes eurydice fumosa | Smoky eyed brown butterfly | Butterfly, smoky eyed brown | I036 | I01 | CO, IA, IL, NE; | Nymphalidae | NA | Insects | 6 | Not Listed | 3, 6 | US | I | Wherever found |
| Sauromalus ater | Chuckwalla | Chuckwalla | C059 | V01 | AZ, CA, NV, UT; | Iguanidae | NA | Reptiles | 1 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Sauromalus varius | San Esteban Island chuckwalla | Chuckwalla, San Esteban Island | C02L | V01 | Mexico | Iguanidae | Mar 20, 1980 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Saussurea weberi | No common name | No common name | Q1MK | P01 | CO, MT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Saxifraga aleutica | Aleutian saxifrage | Saxifrage, Aleutian | Q1ML | P01 | AK; | Saxifragaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Saxifraga bryophora tobiasiae | No common name | No common name | Q38T | P01 | ID; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Saxifraga careyana | [Unnamed] saxifrage | Saxifrage, [unnamed] | Q1MN | P01 | AL, GA, NC, TN, VA; | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Saxifraga caroliniana | Gray's saxifrage | Saxifrage, Gray's | Q1MM | P01 | GA, NC, TN, VA, WV; | Saxifragaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Scaevola coriacea | Dwarf naupaka | Naupaka, dwarf | Q21C | P01 | HI; U.S.A. (HI) | Goodeniaceae | May 16, 1986 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Scaevola gaudichaudiana | No common name | No common name | Q1MQ | P01 | HI; | Goodeniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Scaevola gaudichaudii | Mountain naupaka | Naupaka, mountain | Q21D | P01 | HI; | Goodeniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Scaevola kilaueae | Kilauea naupaka | Naupaka, Kilauea | Q1MP | P01 | HI; | Goodeniaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Scalopus aquaticus anastasae | Anastasia Island mole | Mole, Anastasia Island | A0BF | V01 | FL; | Talpidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Scalopus aquaticus bassi | Englewood mole | Mole, Englewood | A0BG | V01 | FL; | Talpidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Scalopus aquaticus texanus | Presidio mole | Mole, Presidio | A0BH | V01 | TX; | Talpidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Scapanus latimanus parvus | Alameda Island mole | Mole, Alameda Island | A0H1 | V01 | CA; | Talpidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Scaphinotus behrensi | [Unnamed] ground beetle | Ground beetle, [unnamed] | I0O4 | I01 | CA; | Carabidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Scaphinotus inflectus | [Unnamed] ground beetle | Ground beetle, [unnamed] | I0O5 | I01 | AR; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Scaphinotus longiceps | Humboldt ground beetle | Ground beetle, Humboldt | I0NJ | I01 | CA; | Carabidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Scaphinotus parisiana | [Unnamed] ground beetle | Ground beetle, [unnamed] | I0O6 | I01 | AR; | Carabidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| scaphiopus couchii | Couch's spadefoot toad | toad, Couch's spadefoot | D03O | V01 | scaphiopodidae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Scaphirhynchus albus | Pallid sturgeon | Sturgeon, pallid | E06X | V01 | AR, IA, IL, KS, KY, LA, MO, MS, MT, ND, NE, SD, TN; Following listing in 1990, wild pallid sturgeon have been primarily documented in the Missouri River between Fort Benton and the headwaters of Fort Peck Reservoir, Montana; downstream from Fort Peck Dam to the headwaters of Lake Sakakawea, North Dakota; downstream from Garrison Dam, North Dakota to the headwaters of Lake Oahe, South Dakota; from within Lake Sharpe, South Dakota; between Fort Randall and Gavins Point Dams, South Dakota and Nebraska; downstream from Gavins Point Dam to St. Louis, Missouri; in the lower Yellowstone River, Montana and North Dakota; the lower Big Sioux River, South Dakota; the lower Platte River, Nebraska; the lower Niobrara River, Nebraska; the lower Kansas River, Kansas; the middle and lower Mississippi River as well as the Atchafalaya River, Louisiana ; U.S.A. (AR, IA, IL, KS, KY, LA, MO, MS, MT, ND, NE, SD, TN) | Acipenseridae | Sep 06, 1990 | Fishes | 6 | Endangered | 3, 4, 6 | US | V | Wherever found |
| Scaphirhynchus platorynchus | Shovelnose Sturgeon | Sturgeon, Shovelnose | E0BD | V01 | U.S.A. (AL, AR, IA, IL, IN, KS, KY, LA, MN, MO, MS, MT, ND, NE, NM, OH, OK, PA, SD, TN, TX, WI, WV, WY) | Acipenseridae | Oct 01, 2010 | Fishes | 6 | Similarity of Appearance to a Threatened Taxon | NA | US | V | Wherever found |
| Scaphirhynchus suttkusi | Alabama sturgeon | Sturgeon, Alabama | E026 | V01 | AL; U.S.A. (MS, AL) | Acipenseridae | May 05, 2000 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Sceloporus arenicolus | Dunes sagebrush lizard | Lizard, dunes sagebrush | C03J | V01 | NM, TX; | Iguanidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Sceloporus graciosus graciosus | Northern sagebrush lizard | Lizard, northern sagebrush | C05U | V01 | WA; | Iguanidae | NA | Reptiles | 6 | Not Listed | 1 | US | V | Wherever found |
| Sceloporus graciosus vandenburgianus | Southern sagebrush lizard | Lizard, southern sagebrush | C05B | V01 | CA; | Iguanidae | NA | Reptiles | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| sceloporus orcutti | Granite spiny lizard | lizard, Granite spiny | C06W | V01 | phrynosomatidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Sceloporus woodi | Florida scrub lizard | Lizard, Florida scrub | C04N | V01 | FL; | Iguanidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Schenkia sebaeoides | Awiwi | Awiwi | Q30Q | P01 | HI; U.S.A. (HI) | Gentianaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea adamantis | Diamond Head schiedea | Schiedea, Diamond Head | Q21E | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Feb 17, 1984 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea amplexicaulis | Ma`oli`oli | Ma`oli`oli | Q1MR | P01 | HI; Believed to be extinct | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea apokremnos | Ma`oli`oli | Ma`oli`oli | Q2VV | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Sep 30, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea attenuata | No common name | No common name | Q3H7 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea diffusa ssp. macraei | No common name | No common name | Q3OE | P01 | HI; | Caryophyllaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea diffusa subsp. diffusa | No common name | No common name | Q3OS | P01 | HI; ; Schiedea diffusa ssp. diffusa is currently known to exist solely on East Maui. It has not been collected on Molokai since 1981 (Wagner et al. 2005, p. 106). | Caryophyllaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea globosa foliosior | Ma`oli`oli | Ma`oli`oli | Q2I2 | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea globosa globosa | Ma`oli`oli | Ma`oli`oli | Q1MS | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea globosa graminifolia | Ma`oli`oli | Ma`oli`oli | Q1MT | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea haleakalensis | No common name | No common name | Q2VW | P01 | HI; U.S.A. (HI) | Caryophyllaceae | May 15, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea hawaiiensis | Ma`oli`oli | Ma`oli`oli | Q1MU | P01 | HI; | Caryophyllaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea helleri | No common name | No common name | Q2VX | P01 | HI; | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea hookeri | No common name | No common name | Q1MV | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea implexa | No common name | No common name | Q3I5 | P01 | HI; Believed to be extinct | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea jacobii | No common name | No common name | Q3O2 | P01 | HI; | Caryophyllaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea kaalae | No common name | No common name | Q21F | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea kauaiensis | No common name | No common name | Q38U | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea kealiae | Ma`oli`oli | Ma`oli`oli | Q1MW | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea laui | No common name | No common name | Q3O3 | P01 | HI; | Caryophyllaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea ligustrina nematopoda | Ma`oli`oli | Ma`oli`oli | Q1MX | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea lychnoides | Kuawawaenohu | Kuawawaenohu | Q2YL | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea lydgatei | No common name | No common name | Q2VY | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea mannii | No common name | No common name | Q2I3 | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea membranacea | No common name | No common name | Q1MY | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea menziesii | No common name | No common name | Q1MZ | P01 | HI; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Schiedea nuttallii | No common name | No common name | Q38V | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea obovata | No common name | No common name | Q1SQ | P01 | HI; | Caryophyllaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea pubescens | Ma`oli`oli | Ma`oli`oli | Q2VZ | P01 | HI; | Caryophyllaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea salicaria | No common name | No common name | Q21G | P01 | HI; | Caryophyllaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea sarmentosa | No common name | No common name | Q1N2 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea spergulina var. leiopoda | No common name | No common name | Q2W0 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea spergulina var. spergulina | No common name | No common name | Q2W1 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Feb 25, 1994 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Schiedea stellarioides | Laulihilihi | Laulihilihi | Q2W2 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea trinervis | No common name | No common name | Q1SR | P01 | HI; | Caryophyllaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schiedea verticillata | No common name | No common name | Q1N3 | P01 | U.S.A. (HI) | Caryophyllaceae | Aug 21, 1996 | Flowering Plants | 1 | Endangered | NA | US | P | Wherever found |
| Schiedea viscosa | No common name | No common name | Q2X3 | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Schinia indiana | [Unnamed] noctuid moth | Noctuid moth, [unnamed] | I0LS | I01 | AR, IL, IN, MI, MN, NC, NE, TX, WI; | Noctuidae | NA | Insects | 3 | Not Listed | 2, 3, 4, 6 | US | I | Wherever found |
| Schinia rufipenna | Scrub golden aster noctuid moth | Noctuid moth, scrub golden aster | I0NZ | I01 | FL; | Noctuidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Schisandra glabra | No common name | No common name | Q1N4 | P01 | AL, AR, FL, GA, KY, LA, MS, NC, SC, TN; | Schisandraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Schizachyrium niveum | No common name | No common name | Q1N5 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Schizachyrium rhizomatum | No common name | No common name | Q1N6 | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Schizaea pusilla | Curly-grass fern | Fern, curly-grass | S00K | P01 | DE, NJ, NY; Canada (Nfld,N.S,Ont.),St Pierre and Miquelon,Peru | Schizaeaceae | NA | Ferns and Allies | 5 | Not Listed | 5 | US | P | Wherever found |
| Schlotheimia lancifolia | Highlands moss | Moss, highlands | Q38W | P01 | NC; | Orthotrichaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Schoenocrambe argillacea | Clay reed-mustard | Reed-mustard, clay | Q38X | P01 | UT; U.S.A. (UT) | Brassicaceae | Jan 14, 1992 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Schoenocrambe barnebyi | Barneby reed-mustard | Reed-mustard, Barneby | Q2QU | P01 | UT; U.S.A. (UT) | Brassicaceae | Jan 14, 1992 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Schoenocrambe suffrutescens | Shrubby reed-mustard | Reed-mustard, shrubby | Q1N9 | P01 | UT; Shrubby reed-mustard occurs in three meta-populations in Uintah and Duchesne Counties: • Gray Knolls meta-population: centered in the Gray Knolls between the Green River and Hill Creek, Uinta County; • Pack Mountain meta-population: centered on Little Pack Mountain and the slopes of Big Pack Mountain between Hill Creek and Willow Creek, Uinta County; and • Badlands Cliff meta-population: the only meta-population occurring in Duchesne County; the meta-population occurs at the base of the Badlands cliff above the Wrinkles Road (Service 1994b). These three meta-populations contain 7 populations of the shrubby reed-mustard: Agency Draw, Big Pack Mountain, Johnson Draw, Thorn Ranch, Badlands Cliff, Dog Knoll, and Grays Knoll.; U.S.A. (UT) | Brassicaceae | Oct 06, 1987 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Schoenolirion wrightii | Texas sunnybell | Sunnybell, Texas | Q1NA | P01 | AL, AR, LA, TX; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Schoenoplectiella hallii | Hall's bulrush | Bulrush, Hall's | Q38Y | P01 | AL, GA, IA, IL, IN, KS, KY, MA, MI, MO, NE, OH, OK, SC, TX, WI; Wherever found | Cyperaceae | NA | Flowering Plants | 3 | Under Review in the Candidate or Petition Process | 2, 3, 4, 5, 6 | US | P | Wherever found |
| Schoepfia arenaria | No common name | No common name | Q2W3 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Olacaceae | Apr 19, 1991 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Schwalbea americana | American chaffseed | Chaffseed, American | Q2I4 | P01 | AL, FL, GA, LA, MA, NC, NJ, SC; U.S.A. (VA, TN, SC, NY, NJ, NC, MS, MI, MD, MA, LA, GA, FL, DE, CT, AL) | Scrophulariaceae | Sep 29, 1992 | Flowering Plants | 4 | Endangered | 4, 5 | US | P | Wherever found |
| Scirpus ancistrochaetus | Northeastern bulrush | Bulrush, Northeastern | Q21H | P01 | MA, MD, NH, NY, PA, VA, VT, WV; U.S.A. (WV, VT, VA, PA, NY, NH, MD, MA) | Cyperaceae | May 07, 1991 | Flowering Plants | 5 | Endangered | 5 | US | P | Wherever found |
| Scirpus flaccidifolius | Reclining bulrush | Bulrush, reclining | Q1NC | P01 | VA; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 5 | US | P | Wherever found |
| Scirpus longii | Long's bulrush | Bulrush, Long's | Q1ND | P01 | CT, DE, MA, ME, NH, NJ, NY, RI; Canada (N.S.) | Cyperaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| Sciurus arizonensis catalinae | Santa Catalina Mountains squirrel | Squirrel, Santa Catalina Mountains | A0EN | V01 | AZ; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sciurus griseus | Western grey squirrel | Squirrel, western grey | A0HT | V01 | CA, OR, WA; | Sciuridae | NA | Mammals | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Sciurus nayaritensis chiricahuae | Chiricahua Nayarit squirrel | Squirrel, Chiricahua Nayarit | A0EH | V01 | AZ; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sciurus niger avicennia | Big Cypress fox squirrel | Squirrel, Big Cypress fox | A09N | V01 | FL; | Sciuridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Sciurus niger cinereus | Delmarva Peninsula fox squirrel | Squirrel, Delmarva Peninsula fox | A00B | V01 | DE, MD, VA; U.S.A. (Delmarva Peninsula to southeastern PA) | Sciuridae | Mar 11, 1967 | Mammals | 5 | Recovery | 5 | US | V | Wherever found, except where listed as an experimental population |
| Sciurus niger cinereus | Delmarva Peninsula fox squirrel | Squirrel, Delmarva Peninsula fox | A00B | V02 | U.S.A. (Delmarva Peninsula to southeastern PA) | Sciuridae | Sep 13, 1984 | Mammals | 5 | Not Listed | NA | US | V | U.S.A. (DE, Sussex Co.) |
| Sciurus niger shermani | Sherman's fox squirrel | Squirrel, Sherman's fox | A09Q | V01 | FL; | Sciuridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Scleria hirtella | No common name | No common name | Q1NE | P01 | PR, VI; | Cyperaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sclerocactus blainei | Blaine's fishhook cactus | Fishhook cactus, Blaine's | Q38Z | P01 | NV; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sclerocactus brevihamatus ssp. tobuschii | Tobusch fishhook cactus | cactus, Tobusch fishhook | Q1SV | P01 | TX; U.S.A. (TX) | Cactaceae | Dec 08, 1979 | Flowering Plants | 2 | Threatened | 2 | US | P | Wherever found |
| Sclerocactus brevispinus | Pariette cactus | cactus, Pariette | Q3KI | P01 | UT; S. brevispinus is restricted to one population in a 29,000-hectare (ha) (72,000-acre (ac)) area located in the Pariette Draw along the Duchesne-Uintah County boundary (RANA 2009). Land ownership within the range of the species includes Bureau of and Management (BLM), Ute Tribe, State of Utah, and private land, with the majority of the species’ known population occurring on BLM and Ute Tribal lands (Service 2009). Some individuals have been found in marginal habitats outside of the main population areas. More information is needed to better map the species’ range in these areas.; U.S.A. (UT) | Cacatacea | Sep 15, 2009 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Sclerocactus contortus | No common name | No common name | Q3FL | P01 | CO, NM; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Sclerocactus glaucus | Colorado hookless Cactus | Cactus, Colorado hookless | Q21I | P01 | CO; U.S.A. (CO) | Cactaceae | Oct 11, 1979 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Sclerocactus mesae-verdae | Mesa Verde cactus | Cactus, Mesa Verde | Q21J | P01 | CO, NM; U.S.A. (NM, CO) | Cactaceae | Nov 29, 1979 | Flowering Plants | 2 | Threatened | 2, 6 | US | P | Wherever found |
| Sclerocactus papyracanthus | Paper-spined cactus | Cactus, paper-spined | Q1C7 | P01 | AZ, NM, TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sclerocactus polyancistrus | Mojave fishhook cactus | Fishhook cactus, Mojave | Q1NF | P01 | CA, NV; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sclerocactus pubispinus | Great Basin fishhook cactus | Fishhook cactus, Great Basin | Q1NG | P01 | NV, UT; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Sclerocactus schleseri | Schleser's fishhook cactus | Fishhook cactus, Schleser's | Q390 | P01 | NV; | Cactaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sclerocactus sp. | Sp. nov. ined. sclerocactus | Sclerocactus, sp. nov. ined. | Q2I5 | P01 | UT; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sclerocactus spinosior | No common name | No common name | Q1NH | P01 | UT; | Cactaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sclerocactus warnockii | No common name | No common name | Q0OW | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sclerocactus wetlandicus | Uinta Basin hookless cactus | cactus, Uinta Basin hookless | Q3N6 | P01 | UT; Sclerocactus wetlandicus is found primarily within Uintah County, Utah, along the Green River and its tributaries. The potential range of the species is approximately 186,159 hectares (ha) (460,009 acres (ac)), with 56 percent of this area on Federal land, 28 percent on tribal lands, and the remainder on private or State lands (Service 2009).; U.S.A. (UT) | Cactaceae | Sep 15, 2009 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Sclerocactus whipplei heilii | No common name | No common name | Q2I6 | P01 | NM; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sclerocactus whipplei reevesii | No common name | No common name | Q2I7 | P01 | NM; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sclerocactus wrightiae | Wright fishhook cactus | Cactus, Wright fishhook | Q21K | P01 | UT; U.S.A. (UT) | Cactaceae | Oct 11, 1979 | Flowering Plants | 6 | Endangered | 6 | US | P | Wherever found |
| Sclerodermus nihoaensis | Nihoa sclerodermus wasp | Wasp, Nihoa sclerodermus | I0F5 | I01 | HI; | Bethylidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Scleropages formosus | Asian bonytongue | Bonytongue, Asian | E01U | V01 | Thailand, Malaysia, Indonesia | Osteoglossidae | Jun 14, 1976 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Scotorythra megalophylla | Kona giant looper | Looper, Kona giant | I09I | I01 | HI; Believed to be extinct | Geometridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Scotorythra nesiotes | Ko`olau giant looper | Looper, Ko`olau giant | I09J | I01 | HI; Believed to be extinct | Geometridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Scotorythra paratactis | Hawaiian hopseed looper | Looper, Hawaiian hopseed | I09K | I01 | HI; Believed to be extinct | Geometridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Scrophularia atrata | Black-flowered figwort | Figwort, black-flowered | Q1NI | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Scrophularia laevis | Organ Mountain figwort | Figwort, Organ Mountain | Q3FM | P01 | NM; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Scrophularia macrantha | [Unnamed] figwort | Figwort, [unnamed] | Q1NJ | P01 | NM; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Scrophularia villosa | Santa Catalina figwort | Figwort, Santa Catalina | Q2I8 | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Scutellaria floridana | Florida skullcap | Skullcap, Florida | Q2I9 | P01 | FL; U.S.A. (FL) | Lamiaceae | May 08, 1992 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Scutellaria laevis | Smooth-stem skullcap | Skullcap, smooth-stem | Q2W4 | P01 | TX; | Lamiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Scutellaria montana | Large-flowered skullcap | Skullcap, large-flowered | Q2IA | P01 | GA, TN; U.S.A. (TN, GA) | Lamiaceae | Jun 20, 1986 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Scutellaria nana | Ravendale skullcap | Skullcap, Ravendale | Q2QV | P01 | CA, NV; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Scutellaria ocmulgee | Ocmulgee skullcap | skullcap, Ocmulgee | Q1NK | P01 | GA, SC; | Lamiaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Scutellaria ovata pseudoarguta | Heart-leaved, skullcap | Skullcap, heart-leaved, | Q1NL | P01 | VA, WV; | Lamiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Scutellaria saxatilis | [Unnamed] skullcap | Skullcap, [unnamed] | Q391 | P01 | DE, GA, IN, KY, MO, NC, OH, PA, TN, VA, WV; | Lamiaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Scutellaria thieretii | Thieret's skullcap | Skullcap, Thieret's | Q1NM | P01 | LA, TX; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Scytalopus novacapitalis | Brasilia tapaculo | Tapaculo, Brasilia | B0BI | V01 | Rhinocryptidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Sebastes paucispinis | Bocaccio | Bocaccio | E0BI | V01 | Pacific coast from Punta Blanca, Baja California, to the Gulf of Alaska off Krozoff and Kodiak Islands | Sebastidae | Apr 13, 2011 | Fishes | NMFS | Endangered | NA | US/Foreign | V | Puget Sound-Georgia Basin DPS See 50 CFR 224.101 |
| Sebastes pinniger | canary rockfish | rockfish, canary | E0BK | V01 | Pacific coast from Punta Colnett, Baja California to the Western Gulf of Alaska | Sebastidae | Apr 13, 2011 | Fishes | NMFS | Threatened | NA | US | V | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 |
| Sebastes ruberrimus | yelloweye rockfish | rockfish, yelloweye | E0BM | V01 | Pacific coast from northern Baja California to the Aleutian Islands, Alaska | Sebastidae | Apr 13, 2011 | Fishes | NMFS | Threatened | NA | US | V | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 |
| Sedum albomarginatum | Feather River stonecrop | Stonecrop, Feather River | Q1NN | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sedum eastwoodiae | Red Mountain stonecrop | Stonecrop, Red Mountain | Q1NO | P01 | CA; | Crassulaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Sedum laxum flavidum | Pale yellow stonecrop | Stonecrop, pale yellow | Q2IB | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sedum laxum heckneri | Heckner's stonecrop | Stonecrop, Heckner's | Q2IC | P01 | CA, OR; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sedum moranii | Reid's stonecrop | Stonecrop, Reid's | Q1NP | P01 | OR; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sedum nevii | Nevius' stonecrop | Stonecrop, Nevius' | Q1NQ | P01 | AL, GA, TN; | Crassulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sedum niveum | Davidson's stonecrop | Stonecrop, Davidson's | Q2ID | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sedum oblanceolatum | Applegate stonecrop | Stonecrop, Applegate | Q1NR | P01 | CA, OR; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sedum paradisum | Canyon Creek stonecrop | Stonecrop, Canyon Creek | Q3FN | P01 | CA; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sedum pinetorum | Pine City stonecrop | Stonecrop, Pine City | Q2IE | P01 | CA; Possibly extinct | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sedum pusillum | [Unnamed] stonecrop | Stonecrop, [unnamed] | Q1NS | P01 | GA, NC, SC; | Crassulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sedum radiatum depauperatum | Star-fruited, small stonecrop | Stonecrop, star-fruited, small | Q1NT | P01 | CA, OR; | Crassulaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sedum robertsianum | Robert's stonecrop | Stonecrop, Robert's | Q2IF | P01 | TX; | Crassulaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sedum rosea roanensis | [Unnamed] stonecrop | Stonecrop, [unnamed] | Q2IG | P01 | NC, TN; | Crassulaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| selaginella cinerascens | Ashy spike-moss | spike-moss, Ashy | U00A | P01 | selaginellaceae | NA | Lichens | 6 | Not Listed | NA | US | P | Wherever found | |
| Selaginella utahensis | No common name | No common name | S00L | P01 | NV, UT; | Selaginellaceae | NA | Ferns and Allies | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| selasphorus rufus | Rufous hummingbird | hummingbird, Rufous | B0E1 | V01 | trochilidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Selasphorus sasin | Allen's Hummingbird | Hummingbird, Allen's | B0LI | V01 | Trochilidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Selenia jonesii | Jones' selenia | Selenia, Jones' | Q1NW | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Semiothisa fraserata | Fraser fir geometrid moth | Geometrid moth, Fraser fir | I0P8 | I01 | NC, VA; | Geometridae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Semnopithecus (=Presbytis) entellus | Gray (=entellus) langur | Langur, gray (=entellus) | A05M | V01 | Bangladesh,China (Tibet),India,Kashmir,Pakistan,Sikkim,Sri Lanka | Cercopithecidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Semotilus lumbee | Sandhills chub | Chub, Sandhills | E05M | V01 | NC, SC; | Cyprinidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Senecio clevelandii heterophyllus | Red Hills butterweed | Butterweed, Red Hills | Q2IJ | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Senecio dimorphophyllus intermedius | Intermediate groundsel | Groundsel, intermediate | Q1NY | P01 | CO, UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Senecio ertterae | Ertter's ragwort | Ragwort, Ertter's | Q2IK | P01 | OR; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Senecio hallii discoidea | [Unnamed] groundsel | Groundsel, [unnamed] | Q1O0 | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Senecio huachucanus | Huachuca groundsel | Groundsel, Huachuca | Q2IL | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Senecio hydrophilus | No common name | No common name | Q1O8 | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Senecio layneae | Layne's butterweed | Butterweed, Layne's | Q1O2 | P01 | CA; U.S.A. (CA) | Asteraceae | Oct 18, 1996 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Senecio lynceus leucoreus | No common name | No common name | Q1O3 | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Senecio neowebsteri | No common name | No common name | Q1O5 | P01 | WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| senecio quaylei | quayle's ragwort | No common name | Q3LI | P01 | asteraceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Senecio warnockii | No common name | No common name | Q1O9 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Senegalia berlandieri | Emory acacia | Acacia, Emory | Q00C | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Senna ripleyana | Ripley's senna | Senna, Ripley's | Q1OA | P01 | TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Seratella frisoni | Frison's seratellan mayfly | Mayfly, Frison's seratellan | I09U | I01 | AL, IL, MO; Possibly extinct,not reported since 1965 | Ephemerellidae | NA | Insects | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Serianthes nelsonii | Hayun Iagu (=(Guam), Tronkon guafi (Rota)) | Iagu, Hayun (=(Guam), Tronkon guafi (Rota)) | Q2QW | P01 | GU, MP; Western Pacific Ocean-U.S.A. (Guam, MP-Rota) | Fabaceae | Feb 18, 1987 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Seriatopora aculeata | No common name | No common name | P00I | I01 | Pocilloporidae | Nov 13, 2014 | Corals | NMFS | Threatened | NA | Foreign | I | Wherever found | |
| Serica ammomensico | Crescent Dunes serican scarab | Scarab, Crescent Dunes serican | I0LQ | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Crescent Dune |
| Serica frosti | Frost's spring serican scarab | Scarab, Frost's spring serican | I0D8 | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Serica psammobunus | Sand Mountain serican scarab | Scarab, Sand Mountain serican | I0LR | I01 | NV; | Scarabaeidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Serica tantula | Tantula serican scarab | Scarab, tantula serican | I0D9 | I01 | FL; Possibly extinct,not reported since 1965 | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Sericocarpus rigidus | Columbian whitetop aster | Aster, Columbian whitetop | Q3KM | P01 | Asteraceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Sericocarpus rigidus | Curtus aster | Aster, curtus | Q04M | P01 | OR, WA; Canada (B.C.) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US/Foreign | P | Wherever found |
| Serpophaga araguayae | Bananal tyrannulet | Tyrannulet, Bananal | B0BE | V01 | Tyrannidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Serratella serrata | Spiculose serratellan mayfly | mayfly, Spiculose serratellan | I09Z | I01 | NC; Possibly extinct,not reported since 1965 | Ephemerellidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Sesbania tomentosa | Ohai | Ohai | Q2IM | P01 | HI; U.S.A. (HI) | Fabaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sesuvium trianthemoides | Roughseed sea-purslane | Sea-purslane, roughseed | Q1OB | P01 | TX; | Aizoaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Setodes epicampes | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0O7 | I01 | AL, TN; | Leptoceridae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Setonix brachyurus | Quokka | Quokka | A04B | V01 | Australia | Macropodidae | Jun 04, 1973 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Setophaga angelae | Elfin-woods warbler | Warbler, elfin-woods | B07V | V01 | PR; | Parulidae | Jul 22, 2016 | Birds | 4 | Threatened | 4 | US | V | Wherever found |
| Setophaga kirtlandii (= Dendroica kirtlandii) | Kirtland's Warbler | Warbler, Kirtland's | B03I | V01 | FL, MI, OH, SC, WI; Canada,West Indies; U.S.A. (principally MI), Canada, West Indies-Bahama Islands | Parulidae | Mar 11, 1967 | Birds | 3 | Endangered | 3, 4 | US/Foreign | V | Wherever found |
| Seymeria bipinnatisecta | No common name | No common name | Q1OC | P01 | TX; | Scrophulariaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Shortia galacifolia var. brevistyla | Northern Oconee Bells | Oconee Bells, Northern | Q1OE | P01 | NC; | Diapensiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Shortia galacifolia var. galacifolia | Southern Oconee Bells | Oconee Bells, Southern | Q1OD | P01 | GA, NC, SC; | Diapensiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Shoshonea pulvinata | No common name | No common name | Q2W5 | P01 | MT, WY; | Apiaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| sialia mexicana | Western bluebird | bluebird, Western | B0EX | V01 | muscucapidae | NA | Birds | 2 | Not Listed | NA | US | V | Wherever found | |
| Sibara filifolia | Santa Cruz Island rockcress | Rockcress, Santa Cruz Island | Q1OF | P01 | CA; U.S.A. (CA) | Brassicaceae | Aug 08, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Sibara grisea | No common name | No common name | Q2QX | P01 | NM, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sibara rosulata | No common name | No common name | Q2IN | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| sibaropsis hammittii | Hammitt's clay-cress | clay-cress, Hammitt's | Q3K1 | P01 | brassicaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Sicyos albus | `Anunu | `Anunu | Q393 | P01 | HI; U.S.A. (HI) | Cucurbitaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sicyos cucumerinus | `Anunu | `Anunu | Q394 | P01 | HI; | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sicyos hillebrandii | No common name | No common name | Q395 | P01 | HI; Believed to be extinct | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sicyos lanceoloideus | No common name | No common name | Q3OQ | P01 | HI; ; This species is currently known to occur in the Pualii area of the Honouliuli Forest Reserve (Waianae Mountains) on Oahu; and lower Kawaiiki in Waimea Canyon State Park on Kauai (Wagner et al 1999, p. 575; Plant Extinction Prevention Program (PEPP) 2013, p. 189; State of Hawaii 2013, in litt.). | Cucurbitaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sicyos macrophyllus | `Anunu | `Anunu | Q396 | P01 | HI; | Cucurbitaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Sicyos maximowiczii | No common name | No common name | Q2IO | P01 | HI; | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sicyos pachycarpus | No common name | No common name | Q1OH | P01 | HI; | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sicyos pachycarpus | No common name | No common name | Q1OG | P01 | HI; | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sicyos semitonsus | No common name | No common name | Q2IP | P01 | HI; | Cucurbitaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sida fallax | No common name | No common name | Q1OJ | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sida fallax | No common name | No common name | Q1OI | P01 | HI; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sida hermaphrodita | Virginia mallow | Mallow, Virginia | Q2QY | P01 | DC, IN, KY, MD, MI, OH, PA, TN, VA, WV; | Malvaceae | NA | Flowering Plants | 5 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Sida inflexa | No common name | No common name | Q2QZ | P01 | VA; Possibly extinct | Malvaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Sida rubromarginata | No common name | No common name | Q1OK | P01 | FL; | Malvaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sidalcea campestris | Meadow checkermallow | Checkermallow, meadow | Q1OL | P01 | OR; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sidalcea candida | No common name | No common name | Q2IQ | P01 | CO, NM, NV, UT, WY; | Malvaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Sidalcea covillei | Owens Valley checkermallow | Checkermallow, Owens Valley | Q1OM | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea cusickii | No common name | No common name | Q1ON | P01 | OR; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sidalcea hendersonii | Henderson's checkermallow | Checkermallow, Henderson's | Q3IY | P01 | Malvaceae | NA | Flowering Plants | 1 | Not Listed | NA | US/Foreign | P | Wherever found | |
| Sidalcea hickmanii anomala | Cuesta Pass sidalcea | Sidalcea, Cuesta Pass | Q1OO | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea hickmanii hickmanii | Hickman's sidalcea | Sidalcea, Hickman's | Q1OR | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea hickmanii parishii | Parish's checkerbloom | Checkerbloom, Parish's | Q1OP | P01 | CA; | Malvaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea hickmanii viridis | Marin checkermallow | Checkermallow, Marin | Q1OQ | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea keckii | Keck's Checker-mallow | Checker-mallow, Keck's | Q1OS | P01 | CA; U.S.A. (CA) | Malvaceae | Feb 16, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Sidalcea malvaeflora patula | [Unnamed] checkermallow | Checkermallow, [unnamed] | Q3FP | P01 | CA, OR; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sidalcea malviflora elegans | Del Norte checkermallow | Checkermallow, Del Norte | Q2IR | P01 | CA, OR; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sidalcea malviflora ssp. virgata | Dwarf checkerbloom | Checkerbloom, Dwarf | Q3KK | P01 | Malvaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Sidalcea nelsoniana | Nelson's checker-mallow | Checker-mallow, Nelson's | Q21M | P01 | OR, WA; U.S.A. (WA, OR) | Malvaceae | Feb 12, 1993 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Sidalcea oregana hydrophila | Water-loving checkermallow | Checkermallow, water-loving | Q1OV | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea oregana ssp. valida | Kenwood Marsh checker-mallow | Checker-mallow, Kenwood Marsh | Q1OU | P01 | CA; U.S.A. (CA) | Malvaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Sidalcea oregana var. calva | Wenatchee Mountains checkermallow | Checkermallow, Wenatchee Mountains | Q1OT | P01 | WA; U.S.A. (WA) | Malvaceae | Dec 22, 1999 | Flowering Plants | 1 | Endangered | 1 | US | P | Local Endemic |
| Sidalcea pedata | Pedate checker-mallow | Checker-mallow, pedate | Q2IS | P01 | CA; U.S.A. (CA) | Malvaceae | Aug 31, 1984 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Sidalcea robusta | Butte County sidalcea | Sidalcea, Butte County | Q1OW | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sidalcea setosa | No common name | No common name | Q2IT | P01 | CA, OR; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Sidalcea stipularis | Scadden Flat checkerbloom | Checkerbloom, Scadden Flat | Q2IU | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sideroxylon reclinatum ssp. austrofloridense | Everglades bully | Bully, Everglades | Q3IM | P01 | FL; | Sapotaceae | Oct 06, 2017 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Sideroxylon reclinatum var. austrofloridense | Everglades bully | Bully, Everglades | Q3IQ | P01 | Sapotoceae | NA | Flowering Plants | 4 | Not Listed | NA | US | P | Wherever found | |
| Sideroxylon thornei | Georgia bully | bully, Georgia | Q09O | P01 | FL, GA; | Sapotaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Sigmodon arizonae jacksoni | Yavapai Arizona cotton rat | Cotton rat, Yavapai Arizona | A0AS | V01 | AZ; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sigmodon arizonae plenus | Colorado River cotton rat | Cotton rat, Colorado River | A0AN | V01 | CA; | Muridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sigmodon fulviventer goldmani | Hot Springs cotton rat | Cotton rat, Hot Springs | A0AO | V01 | NM; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sigmodon hispidus eremicus | Yuma hispid cotton rat | Cotton rat, Yuma hispid | A0AT | V01 | AZ, CA; | Muridae | NA | Mammals | 2 | Not Listed | 2, 8 | US/Foreign | V | Wherever found |
| Sigmodon hispidus exsputus | Lower Keys cotton rat | Cotton rat, lower Keys | A0AQ | V01 | FL; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Sigmodon hispidus insulicola | Insular hispid Cotton rat | Cotton rat, insular hispid | A0AP | V01 | FL; | Muridae | NA | Mammals | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Sigmodon hispidus littoralis | Micco hispid cotton rat | Cotton rat, Micco hispid | A0AR | V01 | FL; | Muridae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Sigmodon ochrognathus | Yellow-nosed cotton rat | Cotton rat, yellow-nosed | A0G6 | V01 | AZ, NM, TX; | Muridae | NA | Mammals | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Silene alexandri | No common name | No common name | Q21N | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Silene aperta | No common name | No common name | Q2IV | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene campanulata campanulata | Red Mountain catchfly | Catchfly, Red Mountain | Q2IW | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene clokeyi | No common name | No common name | Q1OX | P01 | NV; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene cryptopetala | No common name | No common name | Q1OY | P01 | HI; Believed to be extinct | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Silene degeneri | No common name | No common name | Q1OZ | P01 | HI; Believed to be extinct | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Silene douglasii oraria | Cascade head catchfly | Catchfly, cascade head | Q1P0 | P01 | OR; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Silene hawaiiensis | No common name | No common name | Q2IX | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Mar 04, 1994 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Silene invisa | Red fir catchfly | Catchfly, red fir | Q1P1 | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene lanceolata | No common name | No common name | Q21O | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Silene marmorensis | Marble Mountain catchfly | Catchfly, Marble Mountain | Q1P2 | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene nachlingerae | Jan's catchfly | Catchfly, Jan's | Q397 | P01 | NV; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene occidentalis longistipitata | Butte County catchfly | Catchfly, Butte County | Q398 | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Silene ovata | Blue Ridge catchfly | Catchfly, Blue Ridge | Q399 | P01 | NC; | Caryophyllaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Silene perlmanii | No common name | No common name | Q39A | P01 | HI; U.S.A. (HI) | Caryophyllaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Silene petersonii | Plateau catchfly | Catchfly, plateau | Q2IY | P01 | UT; | Caryophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Silene petersonii minor | Red Canyon catchfly | Catchfly, Red Canyon | Q1P3 | P01 | UT; | Caryophyllaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Silene plankii | Plank's catchfly | Catchfly, Plank's | Q1P4 | P01 | NM, TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Silene polypetala | Fringed campion | Campion, fringed | Q21P | P01 | FL, GA; Majority of species abundance found in Piedmont Fall line ravines of Georgia and extending barely into Atlantic Coastal Plain in Georgia. Located in the Gulf Coastal Plain along the Florida/Georgia border on the Appalachicola River. In Piedmont, species found typically over Biotite Gneiss geology, over various limestones in the Coastal Plain.; U.S.A. (GA, FL) | Caryophyllaceae | Jan 18, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Silene rectiramea | Grand Canyon catchfly | Catchfly, Grand Canyon | Q1P5 | P01 | AZ; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Silene regia | Royal catchfly | Catchfly, royal | Q2IZ | P01 | AL, AR, GA, IL, IN, KS, KY, MO, OH, OK; | Caryophyllaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4, 6 | US | P | Wherever found |
| Silene scaposa lobata | No common name | No common name | Q1P6 | P01 | ID, NV, OR; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Silene scaposa scaposa | No common name | No common name | Q1P7 | P01 | OR; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Silene seelyi | No common name | No common name | Q1P8 | P01 | WA; | Caryophyllaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Silene spaldingii | Spalding's Catchfly | Catchfly, Spalding's | Q1P9 | P01 | ID, MT, OR, WA; U.S.A. (WA, MT, ID, OR), Canada (B.C.) | Caryophyllaceae | Oct 10, 2001 | Flowering Plants | 1 | Threatened | 1, 6 | US | P | Wherever found |
| Silene subciliata | Scarlet catchfly | Catchfly, scarlet | Q39B | P01 | LA, TX; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Silene verecunda verecunda | Mission Dolores campion | Campion, Mission Dolores | Q3AJ | P01 | CA; | Caryophyllaceae | NA | Flowering Plants | 8 | Not Listed | 8 | US | P | Wherever found |
| Silene virginica robusta | [Unnamed] catchfly | Catchfly, [unnamed] | Q39C | P01 | WV; | Caryophyllaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Silene wrightii | No common name | No common name | Q2J0 | P01 | NM; | Caryophyllaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Silphium brachiatum | [Unnamed] rosinweed | Rosinweed, [unnamed] | Q1PA | P01 | AL, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Silphium confertifolium | No common name | No common name | Q2J1 | P01 | AL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Silphium integrifolium gattingeri | [Unnamed] rosinweed | Rosinweed, [unnamed] | Q1PB | P01 | TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Simpsonaias ambigua | Salamander mussel | Mussel, salamander | F01U | I01 | AR, IA, IL, IN, KY, MI, MO, NY, OH, PA, TN, WI, WV; | Unionidae | NA | Clams | 3 | Under Review in the Candidate or Petition Process | 3, 4, 5 | US/Foreign | I | Wherever found |
| Siphlonisca aerodromia | Tomah mayfly | Mayfly, Tomah | I0NT | I01 | ME, NY; | Siphlonuridae | NA | Insects | 5 | Not Listed | 5 | US/Foreign | I | Wherever found |
| Siren intermedia texana | Rio Grande lesser siren | Siren, Rio Grande lesser | D01O | V01 | TX; | Sirenidae | NA | Amphibians | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Sistrurus catenatus | Eastern Massasauga (=rattlesnake) | Massasauga (=rattlesnake), eastern | C03P | V01 | IA, IL, IN, MI, MN, NY, OH, PA, WI; Current | Viperidae | Sep 30, 2016 | Reptiles | 3 | Threatened | 3, 5 | US/Foreign | V | Wherever found |
| Sistrurus catenatus ssp. edwardsii | Desert massasauga | Massasauga, desert | C074 | V01 | CO; | Viperidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | 6 | US/Foreign | V | Wherever found |
| Sisyrinchium dichotomum | White irisette | Irisette, white | Q39D | P01 | NC, SC; U.S.A. (NC) | Iridaceae | Sep 26, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Sisyrinchium hitchcockii | Hitchcock's blue-eyed grass | blue-eyed grass, Hitchcock's | Q3NA | P01 | Iridaceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Sisyrinchium pallidum | Pale blue-eyed grass | Grass, pale blue-eyed | Q39E | P01 | CO, WY; | Iridaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sisyrinchium sarmentosum | Mountain blue-eyed grass | Blue-eyed grass, Mountain | Q2W6 | P01 | OR, WA; | Iridaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sitalcina borregoensis | Anza Borrego blind harvestman | Harvestman, Anza Borrego blind | J01I | I01 | Phalangodidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| sitta carolinensis ssp. aculeata | White-breasted nuthatch | nuthatch, White-breasted | B0E9 | V01 | sittidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Sitta ledanti | Algerian nuthatch | Nuthatch, Algerian | B09V | V01 | Algeria | Sittidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sium suave | Florida water-parsnip | Water-parsnip, Florida | Q1PD | P01 | AL, FL; Possibly extinct | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Skistodiaptomus carolinensis | Carolina skistodiaptomus | Skistodiaptomus, Carolina | K04I | I01 | NC; | Cyclopidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Smelowskia borealis villosa | No common name | No common name | Q1PE | P01 | AK; | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Smelowskia holmgrenii | No common name | No common name | Q1PF | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Smelowskia ovalis congesta | Mt. Lassen smelowskia | Smelowskia, Mt. Lassen | Q1PG | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Smelowskia pyriformis | No common name | No common name | Q1PH | P01 | AK; | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Smilax melastomifolia melastomifolia | No common name | No common name | Q1PI | P01 | HI; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Smilax pseudochina | No common name | No common name | Q2W7 | P01 | GA; Possibly extinct | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Sminthopsis longicaudata | Long-tailed marsupial-mouse | Marsupial-mouse, long-tailed | A036 | V01 | Entire | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sminthopsis psammophila | Large desert marsupial-mouse | Marsupial-mouse, large desert | A035 | V01 | Entire | Dasyuridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Smithistruma reliquia | Ancient ant | Ant, ancient | I0P0 | I01 | CA; | Formicidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Snyderichthys copei | Leatherside chub | Chub, leatherside | E05L | V01 | ID, UT, WY; | Cyprinidae | NA | Fishes | 6 | Not Listed | 1, 6 | US | V | Wherever found |
| Solanum bahamense rugelii | [Unnamed] nightshade | Nightshade, [unnamed] | Q1PJ | P01 | FL; Believed to be extinct | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solanum carolinense floridanum | No common name | No common name | Q2J2 | P01 | FL; | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solanum carolinense hirsutum | [Unnamed] horse-nettle | Horse-nettle, [unnamed] | Q1PK | P01 | GA; Possibly extinct | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solanum conocarpum | Marron bacora | Bacora, marron | Q1PL | P01 | VI; Possibly extinct | Solanaceae | NA | Flowering Plants | 4 | Candidate | 4 | US | P | Wherever found |
| Solanum drymophilum | Erubia | Erubia | Q2J3 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Solanaceae | Aug 26, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Solanum guamense | Berenghenas halomtano | halomtano, Berenghenas | Q3P1 | P01 | GU; | Solanaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Solanum incompletum | Popolo ku mai | Popolo ku mai | Q21Q | P01 | HI; U.S.A. (HI) | Solanaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Solanum mucronatum | No common name | No common name | Q1PM | P01 | PR, VI; | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solanum nelsonii | Popolo | Popolo | Q21R | P01 | HI; | Solanaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Solanum sandwicense | `Aiakeakua, popolo | `Aiakeakua, popolo | Q21S | P01 | HI; U.S.A. (HI) | Solanaceae | Feb 25, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Solanum tenuilobatum | Narrow-leaved nightshade | Nightshade, narrow-leaved | Q1PN | P01 | CA; | Solanaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Solanum woodburyi | No common name | No common name | Q1PO | P01 | PR, VI; | Solanaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solenodon cubanus | Cuban solenodon | Solenodon, Cuban | A02D | V01 | Cuba | Solenodontidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Solenodon paradoxus | Haitian solenodon | Solenodon, Haitian | A02E | V01 | Haiti, Dominican Republic | Solenodontidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Solidago albopilosa | White-haired goldenrod | Goldenrod, white-haired | Q21T | P01 | KY; U.S.A. (KY) | Asteraceae | Apr 07, 1988 | Flowering Plants | 4 | Recovery | 4 | US | P | Wherever found |
| Solidago arenicola | Southern Racemose goldenrod | goldenrod, Southern Racemose | Q3PO | P01 | AL, TN; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Solidago arguta harrissii | No common name | No common name | Q2J4 | P01 | MD, PA, VA, WV; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Solidago houghtonii | Houghton's goldenrod | Goldenrod, Houghton's | Q2J5 | P01 | MI, NY; Canada (Ont.); U.S.A. (MI), Canada (Ont.) | Asteraceae | Jul 18, 1988 | Flowering Plants | 3 | Threatened | 3, 5 | US/Foreign | P | Wherever found |
| Solidago mollis angustata | No common name | No common name | Q1PP | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Solidago ouachitensis | No common name | No common name | Q39F | P01 | AR, OK; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Solidago petiolaris | No common name | No common name | Q2J6 | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Solidago plumosa | Yadkin River Goldenrod | Goldenrod, Yadkin River | Q39G | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Entire |
| Solidago porteri | Porter's goldenrod | Goldenrod, Porter's | Q1PQ | P01 | GA; Possibly extinct | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solidago pulchra | Carolina goldenrod | Goldenrod, Carolina | Q1PR | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Solidago shortii | Short's goldenrod | Goldenrod, Short's | Q21U | P01 | IN, KY; U.S.A. (KY) | Asteraceae | Sep 05, 1985 | Flowering Plants | 4 | Endangered | 3, 4 | US | P | Wherever found |
| Solidago simulans | Granite Dome Goldenrod | Goldenrod, Granite Dome | Q3SP | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | |
| Solidago sphathulata gillmanii | No common name | No common name | Q3FQ | P01 | IN, MI, WI; | Asteraceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Solidago spithamaea | Blue Ridge goldenrod | Goldenrod, Blue Ridge | Q2J7 | P01 | NC, TN; U.S.A. (TN, NC) | Asteraceae | Mar 28, 1985 | Flowering Plants | 4 | Threatened | 4 | US | P | Wherever found |
| Solidago verna | Spring-flowering goldenrod | Goldenrod, spring-flowering | Q1PS | P01 | NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Soliperla fenderi | Fender's soliperlan stonefly | Stonefly, Fender's soliperlan | I0E9 | I01 | WA; | Peltoperlidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Somateria fischeri | Spectacled eider | Eider, spectacled | B08Z | V01 | AK; Breeds on North Slope and Yukon Kuskokwim Delta, possibly on Seward Peninsula as well. Molts in Ledyard Bay, Norton Sound, congregates around St. Lawrence Island in fall, winters in waters south and west of St. Lawrence Island, north of St. Matthew Island.; C.I.S; U.S.A. (AK), Russia | Anatidae | May 10, 1993 | Birds | 7 | Threatened | 7 | US/Foreign | V | Wherever found |
| Somatochlora calverti | Calvert's emerald | emerald, Calvert's | I0WW | I01 | AL, FL, SC; | Corduliidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Somatochlora hineana | Hine's emerald dragonfly | Dragonfly, Hine's emerald | I06P | I01 | IL, MI, MO, WI; U.S.A. (WI, OH, MO, MI, IN, IL, AL) | Corduliidae | Jan 26, 1995 | Insects | 3 | Endangered | 3 | US | I | Wherever found |
| Somatochlora margarita | Texas emerald | emerald, Texas | I06O | I01 | LA, OK, TX; | Corduliidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2, 4 | US | I | Wherever found |
| Somatochlora ozarkensis | Ozark emerald | emerald, Ozark | I0WX | I01 | AR, KS, MO, OK; | Corduliidae | NA | Insects | 4 | Not Listed | 2, 3, 4, 6 | US | I | Wherever found |
| Somatogyrus alcoviensis | Reverse pepplesnail | pepplesnail, Reverse | G0GH | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Somatogyrus amnicoloides | Oachita pebblesnail | Pebblesnail, Oachita | G07G | I01 | AR; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus aureus | Golden pebblesnail | Pebblesnail, golden | G07H | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus biangulatus | Angular pebblesnail | Pebblesnail, angular | G07I | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus constrictus | Knotty pebblesnail | Pebblesnail, knotty | G07J | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus coosaensis | Coosa pebblesnail | Pebblesnail, Coosa | G07K | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus crassilabris | Thick-lipped pebblesnail | Pebblesnail, thick-lipped | G07L | I01 | AR; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus crassus | Stocky pebblesnail | Pebblesnail, stocky | G07M | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus currierianus | Tennessee pebblesnail | Pebblesnail, Tennessee | G07N | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus decipiens | Hidden pebblesnail | Pebblesnail, hidden | G07O | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus excavatus | Ovate pebblesnail | Pebblesnail, ovate | G07P | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus hendersoni | Fluted pebblesnail | Pebblesnail, fluted | G07Q | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus hinkleyi | Granite pebblesnail | Pebblesnail, granite | G07R | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus humerosus | Atlas pebblesnail | Pebblesnail, Atlas | G07S | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus nanus | Dwarf pebblesnail | Pebblesnail, dwarf | G07T | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus obtusus | Moon pebblesnail | Pebblesnail, moon | G07U | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus parvulus | Sparrow pebblesnail | Pebblesnail, sparrow | G02J | I01 | TN; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus pilsbryanus | Tallapoosa pebblesnail | Pebblesnail, Tallapoosa | G07V | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus pygmaeus | Pygmy pebblesnail | Pebblesnail, pygmy | G07W | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus quadratus | Quadrate pebblesnail | Pebblesnail, quadrate | G07X | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus sargenti | Mud pebblesnail | Pebblesnail, mud | G07Y | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus strengi | Rolling pebblesnail | Pebblesnail, rolling | G07Z | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus tenax | Savannah pebblesnail | Pebblesnail, Savannah | G02K | I01 | GA; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus tennesseensis | Opaque pebblesnail | Pebblesnail, opaque | G080 | I01 | AL, TN; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somatogyrus virginicus | Panhandle pebblesnail | Pebblesnail, Panhandle | G09Z | I01 | NC, VA; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Somatogyrus wheeleri | Channeled pebblesnail | Pebblesnail, channeled | G081 | I01 | AR; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Somoana abbreviata | Short Samoan tree snail | Snail, Short Samoan tree | G03N | I01 | AS; Possibly extinct | Partulidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| sonora semiannulata | Valley Form ground snake | snake, Valley Form ground | C06Y | V01 | colubridae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| sonorarctia fervida | No common name | No common name | I0UG | I01 | arctiidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Sonorella allynsmithi | Squaw Park talussnail | Talussnail, Squaw Park | G091 | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Sonorella animasensis | Animas Talussnail | Talussnail, Animas | G0I3 | I01 | Helminthoglyptidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Sonorella christenseni | Clark Peak talussnail | Talussnail, Clark Peak | G08W | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Sonorella eremita | San Xavier talussnail | Talussnail, San Xavier | G03Y | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Sonorella grahamensis | Pinaleno talussnail | Talussnail, Pinaleno | G090 | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| sonorella huecoensis | hueco mountains talus snail | No common name | G0DR | I01 | helminthoglyptidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Sonorella imitator | Mimic talussnail | Talussnail, mimic | G08Z | I01 | AZ; | Helminthoglyptidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Sonorella macrophallus | Wet Canyon talussnail | Talussnail, Wet Canyon | G092 | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Sonorella magdalenensis | Sonoran talussnail | Talussnail, Sonoran | G0G0 | I01 | AZ; U.S.A. (AZ), Mexico | Helminthoglyptidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | I | Wherever found |
| Sonorella metcalfi | Franklin Mountain talussnail | Talussnail, Franklin Mountain | G03X | I01 | TX; | Helminthoglyptida | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| sonorella pedregosensis | leslis canyon talussnail | No common name | G0DS | I01 | helminthoglyptidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Sonorella rosemontensis | Rosemont talussnail | Talussnail, Rosemont | G0FZ | I01 | AZ; U.S.A. (AZ) | Helminthoglyptidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Sonorella sp. | Ladybug Saddle talussnail | Talussnail, Ladybug Saddle | G08Y | I01 | AZ; | Helminthoglyptida | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| sonorella species | terrestrial snail | snail, terrestrial | G0DP | I01 | helminthoglyptidae | NA | Snails | 2 | Not Listed | NA | US | I | Wherever found | |
| Sonorella todseni | Dona Ana talussnail | Talussnail, Dona Ana | G08X | I01 | NM; | Helminthoglyptida | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Sophora arizonica | No common name | No common name | Q21V | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sophora arizonica | No common name | No common name | Q1PT | P01 | AZ; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sophora chrysophylla circularis | No common name | No common name | Q1PU | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla elliptica | No common name | No common name | Q1PV | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla glabrata | No common name | No common name | Q1PW | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla grisea | No common name | No common name | Q1PX | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla kanaioensis | No common name | No common name | Q1PY | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla kauensis | No common name | No common name | Q1PZ | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla lanaiensis | No common name | No common name | Q2J8 | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla makuaensis | No common name | No common name | Q1Q0 | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora chrysophylla unifoliata | No common name | No common name | Q1Q1 | P01 | HI; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sophora gypsophila guadalupensis | Guadalupe Mountains mescal bean | Mescal bean, Guadalupe Mountains | Q1Q2 | P01 | NM, TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sophora leachiana | No common name | No common name | Q2W8 | P01 | OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sorex alaskanus | Glacier Bay water shrew | Shrew, Glacier Bay water | A0DY | V01 | AK; | Soricidae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Sorex arizonae | Arizona shrew | Shrew, Arizona | A09F | V01 | AZ, NM; | Soricidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sorex cinereus nigriculus | Tuckahoe masked shrew | Shrew, Tuckahoe masked | A0EC | V01 | DE, NJ; | Soricidae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Sorex dispar | Long-tailed shrew | Shrew, long-tailed | A0DZ | V01 | DE, MA, MD, ME, NC, NH, NJ, NY, PA, TN, VA, VT, WV; | Soricidae | NA | Mammals | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Sorex hoyi winnemana | Southern pygmy shrew | Shrew, southern pygmy | A09L | V01 | IL, IN, KY, MD, NC, OH, TN, VA; | Soricidae | NA | Mammals | 5 | Not Listed | 3, 4, 5 | US | V | Wherever found |
| Sorex hydrodromus | Pribilof Islands shrew | Shrew, Pribilof Islands | A0E7 | V01 | AK; | Soricidae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Sorex longirostris eionis | Homossassa shrew | Shrew, Homossassa | A09H | V01 | FL; | Soricidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Sorex longirostris fisheri | Dismal Swamp southeastern shrew | Shrew, Dismal Swamp southeastern | A09G | V01 | NC, VA; | Soricidae | Sep 26, 1986 | Mammals | 5 | Original Data in Error - New Information Discovered | 4, 5 | US | V | Wherever found |
| Sorex lyelli | Mt. Lyell shrew | Shrew, Mt. Lyell | A0E3 | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex monticolus parvidens | San Bernardino dusky shrew | Shrew, San Bernardino dusky | A09I | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex ornatus relictus | Buena Vista Lake ornate Shrew | Shrew, Buena Vista Lake ornate | A0DV | V01 | CA; U.S.A. (CA) | Soricidae | Mar 06, 2002 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Sorex ornatus salarius | Monterey ornate shrew | Shrew, Monterey ornate | A0E2 | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex ornatus salicornicus | Salt marsh ornate shrew | Shrew, salt marsh ornate | A0E8 | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex ornatus sinuosus | Suisun ornate shrew | Shrew, Suisun ornate | A0EB | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex ornatus willetti | Santa Catalina ornate shrew | Shrew, Santa Catalina ornate | A09J | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sorex palustris navigator | Arizona water shrew | Shrew, Arizona water | A0HH | V01 | AZ; | Soricidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sorex palustris punctulatus | Southern water shrew | Shrew, southern water | A0EA | V01 | MD, NC, PA, TN, VA, WV; | Soricidae | NA | Mammals | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Sorex preblei | Preble's shrew | Shrew, Preble's | A0E6 | V01 | WA; | Soricidae | NA | Mammals | 6 | Not Listed | 1 | US | V | Wherever found |
| Sorex trigonirostris | Ashland shrew | Shrew, Ashland | A0DU | V01 | OR; | Soricidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Sorex trowbridgii destructioni | Destruction Island shrew | Shrew, Destruction Island | A0DW | V01 | WA; | Soricidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Sorex vagrans halicoetes | Salt marsh vagrant shrew | Shrew, salt marsh vagrant | A0E9 | V01 | CA; | Soricidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Sosippus placidus | Lake Placid funnel wolf spider | Wolf spider, Lake Placid funnel | J007 | I01 | FL; | Lycosidae | NA | Arachnids | 4 | Not Listed | 4 | US | I | Wherever found |
| Sousa chinensis taiwanensis | Taiwanese humpback dolphin | dolphin, Taiwanese humpback | A0LB | V01 | Delphinidae | NA | Mammals | NMFS | Proposed Endangered | NA | Foreign | V | Entire | |
| Spanglerogyrus albiventris | Red Hills unique whirligig | Whirligig, Red Hills unique | I0GL | I01 | AL; | Gyrinidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Spaniacris deserticola | Mexicali Lubber grasshopper | Grasshopper, Mexicali Lubber | I0T5 | I01 | Tettigoniidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Spartiniphaga carterae | Carter's noctuid moth | Noctuid moth, Carter's | I0NY | I01 | DE, NC, NJ; | Noctuidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Spea hammondii | Western spadefoot | Spadefoot, western | D02Z | V01 | CA; | Pelobatidae | NA | Amphibians | 1 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Spelaeorchestia koloana | Kauai cave amphipod | Amphipod, Kauai cave | K022 | I01 | HI; U.S.A. (HI) | Talitridae | Jan 14, 2000 | Crustaceans | 1 | Endangered | 1 | US | I | Wherever found |
| speodesmus | (Speodesmus) millipede | millipede, (Speodesmus) | H001 | I01 | polydesmidae | NA | Millipedes | 6 | Not Listed | NA | US | I | Wherever found | |
| Speoplatyrhinus poulsoni | Alabama cavefish | Cavefish, Alabama | E011 | V01 | AL; U.S.A. (AL) | Amblyopsidae | Oct 11, 1977 | Fishes | 4 | Endangered | 4 | US | V | Wherever found |
| Spermolepis hawaiiensis | No common name | No common name | Q39H | P01 | HI; U.S.A. (HI) | Apiaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Spermophilus mohavensis | Mohave ground squirrel | Squirrel, Mohave ground | A0EJ | V01 | CA; | Sciuridae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Spermophilus richardsoni nevadensis | Richardson's ground squirrel | Ground squirrel, Richardson's | A0AZ | V01 | ID, NV, OR; | Sciuridae | NA | Mammals | 1 | Not Listed | 1, 8 | US | V | Wherever found |
| Spermophilus tereticaudus chlorus | Palm Springs round-tailed ground (=Coachella Valley) Squirrel | Squirrel, Palm Springs round-tailed ground (=Coachella Valley) | A0EI | V01 | CA; | Sciuridae | NA | Mammals | 8 | Not Listed | 8 | US | V | Wherever found |
| Spermophilus tridecemlineatus alleni | Allen's 13-lined ground squirrel | Squirrel, Allen's 13-lined ground | A0EG | V01 | WY; | Sciuridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Spermophilus tridecemlineatus monticola | White Mountains ground squirrel | Ground squirrel, White Mountains | A0B0 | V01 | AZ; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Speyeria adiaste | Unsilvered fritillary | Fritillary, unsilvered | I00S | I01 | CA; U.S.A. (CA) | Nymphalidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Speyeria adiaste atossa | Atossa fritillary | Fritillary, Atossa | I00W | I01 | CA; Believed to be extinct | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria adiaste clemencei | Clemence's fritillary butterfly | Butterfly, Clemence's fritillary | I00A | I01 | CA; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria atlantis greyi | Grey's silverspot | Silverspot, Grey's | I0O8 | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria callippe callippe | Callippe silverspot butterfly | Butterfly, callippe silverspot | I019 | I01 | CA; U.S.A. (CA) | Nymphalidae | Dec 05, 1997 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Speyeria callippe extincta | Willamette silverspot | Silverspot, Willamette | I0LU | I01 | OR; Believed to be extinct | Nymphalidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Speyeria diana | Diana fritillary | Fritillary, Diana | I0NF | I01 | AR, GA, IL, IN, LA, MD, MO, MS, NC, OH, PA, SC, TN, VA, WV; | Nymphalidae | NA | Insects | 4 | Not Listed | 3, 4, 5 | US | I | Wherever found |
| Speyeria egleis tehachapina | Tehachapi Mountain silverspot | Silverspot, Tehachapi Mountain | I00Y | I01 | CA; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria hydaspe conquista | Hydaspe fritillary butterfly | Butterfly, Hydaspe fritillary | I034 | I01 | CO, NM; | Nymphalidae | NA | Insects | 6 | Not Listed | 2, 6 | US | I | Wherever found |
| Speyeria idalia | Regal fritillary | Fritillary, regal | I075 | I01 | AR, CO, CT, DE, IA, IL, IN, KS, MA, MD, ME, MI, MN, MO, MT, NC, ND, NE, NH, NJ, NY, OH, OK, PA, SD, VA, VT, WI, WV; | Nymphalidae | NA | Insects | 6 | Under Review in the Candidate or Petition Process | 2, 3, 4, 5, 6 | US/Foreign | I | Wherever found |
| Speyeria nokomis apacheana | Apache silverspot butterfly | Butterfly, Apache silverspot | I005 | I01 | CA, NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria nokomis caerulescens | Blue silverspot | Silverspot, blue | I00Z | I01 | AZ; | Nymphalidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Speyeria nokomis carsonensis | Carson Valley silverspot | Silverspot, Carson Valley | I0O9 | I01 | CA, NV; U.S.A. (CA, NV) | Nymphalidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Speyeria nokomis nigrocaerulea | Blueblack silverspot butterfly | Butterfly, blueblack silverspot | I018 | I01 | AZ, NM; | Nymphalidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Speyeria nokomis nitocris | Mountain silverspot butterfly | Butterfly, mountain silverspot | I00M | I01 | AZ, CO, NM; | Nymphalidae | NA | Insects | 2 | Not Listed | 2, 6 | US | I | Wherever found |
| Speyeria nokomis nokomis | Great Basin silverspot | Silverspot, Great Basin | I010 | I01 | CO, UT; | Nymphalidae | NA | Insects | 6 | Under Review in the Candidate or Petition Process | 6 | US | I | Wherever found |
| Speyeria zerene behrensii | Behren's silverspot butterfly | Butterfly, Behren's silverspot | I031 | I01 | CA; U.S.A. (CA) | Nymphalidae | Dec 05, 1997 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Speyeria zerene carolae | Carole's silverspot | Silverspot, Carole's | I0LT | I01 | NV; | Nymphalidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Speyeria zerene hippolyta | Oregon silverspot butterfly | Butterfly, Oregon silverspot | I01A | I01 | CA, OR, WA; U.S.A. (WA, OR, CA) | Nymphalidae | Jul 02, 1980 | Insects | 1 | Threatened | 1, 8 | US | I | Wherever found |
| Speyeria zerene hippolyta | Oregon silverspot butterfly | Butterfly, Oregon silverspot | I01A | I02 | Nymphalidae | Jun 23, 2017 | Insects | 1 | Experimental Population, Non-Essential | NA | US | I | Entire | |
| Speyeria zerene myrtleae | Myrtle's silverspot butterfly | Butterfly, Myrtle's silverspot | I00N | I01 | CA; U.S.A. (CA) | Nymphalidae | Jun 22, 1992 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Sphaeralcea caespitosa | Jones' globe-mallow | Globe-mallow, Jones' | Q1Q3 | P01 | NV, UT; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Sphaeralcea fendleri albescens | [Unnamed] globe-mallow | Globe-mallow, [unnamed] | Q1Q4 | P01 | AZ; | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sphaeralcea gierischii | Gierisch mallow | mallow, Gierisch | Q3LJ | P01 | AZ, UT; | malvaceae | Sep 12, 2013 | Flowering Plants | 2 | Endangered | 2, 6 | US | P | Wherever found |
| Sphaeralcea janeae | No common name | No common name | Q3FR | P01 | UT; | Malvaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sphaeralcea procera | No common name | No common name | Q2R0 | P01 | NM; Believed to be extinct | Malvaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sphaeralcea psoraloides | No common name | No common name | Q2W9 | P01 | UT; | Malvaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sphaeralcea rusbyi eremicola | Rusby's desert-mallow | Desert-mallow, Rusby's | Q1Q5 | P01 | CA; | Malvaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sphaerodactylus micropithecus | Monito gecko | Gecko, Monito | C038 | V01 | PR; Endemic to Monito Island; U.S.A. (PR) | Gekkonidae | Oct 15, 1982 | Reptiles | 4 | Endangered | 4 | US | V | Wherever found |
| Sphaeroderus schaumi | Schaum's Blue Ridge ground beetle | Ground beetle, Schaum's Blue Ridge | I07F | I01 | VA; | Carabidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Sphaeromeria compacta | [Unnamed] tansy | Tansy, [unnamed] | Q1Q6 | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Sphaeromeria ruthiae | Zion tansy | Tansy, Zion | Q1Q7 | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sphaeromeria simplex | Laramie false sagebrush | False sagebrush, Laramie | Q1Q8 | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| sphaeromicola moria | A Cave Obligate Shrimp | Shrimp, A Cave Obligate | K05T | I01 | entocytheridae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Sphalloplana culveri | Culver's planarian | Planarian, Culver's | M006 | I01 | WV; | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| Sphalloplana holsingeri | Holsinger's groundwater planarian | Planarian, Holsinger's groundwater | M003 | I01 | VA; Believed to be extinct | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| sphalloplana mohri | (Sphalloplana mohri) flatworm | flatworm, (Sphalloplana mohri) | M008 | I01 | planariidae | NA | Flatworms and Roundworms | 6 | Not Listed | NA | US | I | Wherever found | |
| Sphalloplana pricei | Refton Cave planarian | Planarian, Refton Cave | M004 | I01 | PA; | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| Sphalloplana subtilis | Bigger's groundwater planarian | Planarian, Bigger's groundwater | M002 | I01 | VA; Believed to be extinct | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| Sphalloplana virginiana | [Unnamed] planarian | Planarian, [unnamed] | M007 | I01 | VA; | Kenkiidae | NA | Flatworms and Roundworms | 5 | Not Listed | 5 | US | I | Wherever found |
| Spheniscus demersus | African penguin | penguin, African | B0FM | V01 | Atlantic Ocean-South Africa, Namibia, Gabon, Mozambique | Spheniscidae | Oct 29, 2010 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Spheniscus humboldti | Humboldt penguin | penguin, Humboldt | B0FN | V01 | Eastern Pacific Ocean-Peru, Chile | Spheniscidae | Sep 02, 2010 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Spheniscus mendiculus | Galapagos penguin | Penguin, Galapagos | B02M | V01 | Ecuador (Galapagos Islands) | Spheniscidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sphenodon guntheri | Brother's Island tuatara | Tuatara, Brother's Island | C00N | V01 | New Zealand (Brothers Island) | Sphenodontidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sphenodon punctatus | Tuatara | Tuatara | C00L | V01 | New Zealand | Sphenodontidae | Jun 02, 1970 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Sphenolobopsis pearsoni | [Unnamed] liverwort | Liverwort, [Unnamed] | Q39I | P01 | NC, TN; | Cephaloziellaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Spheterista oheoheana | `Ohe`ohe leafroller | Leafroller, `Ohe`ohe | I084 | I01 | HI; | Tortricidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Spheterista pterotropiana | Greenbanded 'ohe'ohe leafroller | Leafroller, Greenbanded 'ohe'ohe | I085 | I01 | HI; | Tortricidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Spheterista reynoldsiana | Wailupe leafroller | Leafroller, Wailupe | I086 | I01 | HI; | Tortricidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| sphingicampa blanchardi | Royal Moth | Moth, Royal | I0UB | I01 | TX; | saturniidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| sphingicampa raspa | No common name | No common name | I0UR | I01 | saturniidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| sphinx eremitoides | No common name | No common name | I0UX | I01 | sphingidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| sphinx smithi | sphinx moth | No common name | I0UE | I01 | sphingidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Sphyrapicus thyroideus | Williamson's Sapsucker | Sapsucker, Williamson's | B0FX | V01 | Picidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| sphyrapicus varius | Yellow-bellied sapsucker | sapsucker, Yellow-bellied | B0FR | V01 | Picidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Sphyrna lewini | Scalloped Hammerhead Shark | Shark, Scalloped Hammerhead | E0CL | V02 | Sphyrnidae | Sep 02, 2014 | Fishes | NMFS | Endangered | NA | US/Foreign | V | Eastern Pacific DPS | |
| Sphyrna lewini | Scalloped Hammerhead Shark | Shark, Scalloped Hammerhead | E0CL | V03 | Sphyrnidae | Sep 02, 2014 | Fishes | NMFS | Threatened | NA | Foreign | V | Central and Southwest Atlantic DPS | |
| Sphyrna lewini | Scalloped Hammerhead Shark | Shark, Scalloped Hammerhead | E0CL | V04 | Sphyrnidae | Sep 02, 2014 | Fishes | NMFS | Endangered | NA | Foreign | V | Eastern Atlantic DPS | |
| Sphyrna lewini | Scalloped Hammerhead Shark | Shark, Scalloped Hammerhead | E0CL | V05 | Sphyrnidae | Sep 02, 2014 | Fishes | NMFS | Threatened | NA | Foreign | V | Indo-West Pacific DPS | |
| Spigelia gentianoides | Gentian pinkroot | Pinkroot, gentian | Q21W | P01 | AL, FL; U.S.A. (FL, AL) | Loganiaceae | Nov 26, 1990 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Spigelia loganioides | [Unnamed] pinkroot | Pinkroot, [unnamed] | Q1Q9 | P01 | FL; | Loganiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Spigelia texana | No common name | No common name | Q2J9 | P01 | TX; | Loganiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Spilogale putorius amphiala | Channel Islands spotted skunk | Skunk, Channel Islands spotted | A0EE | V01 | CA; | Mustelidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Spilogale putorius interrupta | Eastern spotted skunk | Skunk, Eastern spotted | A0GI | V01 | CO; | Mustelidae | NA | Mammals | 3 | Under Review in the Candidate or Petition Process | 6 | US | V | Wherever found |
| Spinadis simplex | Wallace's deepwater mayfly | Mayfly, Wallace's deepwater | I0NU | I01 | GA, IN, MS, WI; | Heptageniidae | NA | Insects | 3 | Not Listed | 3, 4 | US | I | Wherever found |
| Spiraea virginiana | Virginia spiraea | Spiraea, Virginia | Q2R1 | P01 | GA, KY, NC, OH, TN, VA, WV; U.S.A. (WV, VA, TN, PA, OH, NC, KY, GA) | Rosaceae | Jun 15, 1990 | Flowering Plants | 5 | Threatened | 3, 4, 5 | US | P | Wherever found |
| Spiranthes delitescens | Canelo Hills ladies-tresses | ladies-tresses, Canelo Hills | Q3FS | P01 | AZ; U.S.A. (AZ) | Orchidaceae | Jan 06, 1997 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Spiranthes diluvialis | Ute ladies'-tresses | Ladies'-tresses, Ute | Q2WA | P01 | CO, ID, MT, NE, NV, UT, WA, WY; U.S.A. (WY, WA, UT, NV, NE, MT, ID, CO) | Orchidaceae | Jan 17, 1992 | Flowering Plants | 6 | Threatened | 1, 6, 8 | US | P | Wherever found |
| Spiranthes infernalis | Ash Meadows ladies'-tresses | Ladies'-tresses, Ash Meadows | Q39J | P01 | NV; | Orchidaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Spiranthes lanceolata paludicola | [Unnamed] ladies'-tresses | Ladies'-tresses, [unnamed] | Q1QA | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Spiranthes parksii | Navasota ladies-tresses | Ladies-tresses, Navasota | Q21X | P01 | TX; U.S.A. (TX) | Orchidaceae | May 06, 1982 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Spirinchus thaleichthys | longfin smelt | Smelt, longfin | E0BC | V02 | CA; | Osmeridae | NA | Fishes | 8 | Candidate | 8 | US | V | San Francisco Bay delta population |
| Spizaetus floris | Flores hawk-eagle | eagle, Flores hawk | B0H7 | V01 | Accipitridae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Spizella atrogularis | Black-chinned Sparrow | Sparrow, Black-chinned | B0IR | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Spizella breweri | Brewer's Sparrow | Sparrow, Brewer's | B0HA | V01 | Emberizidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Spondylurus monae | Mona Skink | Skink, Mona | C07K | V01 | PR, VI; | Scincidae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US/Foreign | V | Wherever found |
| Spongilla heteroslerifa | Oneida sponge | Sponge, Oneida | O004 | I01 | NY; | Spongillidae | NA | Sponges | 5 | Not Listed | 5 | US | I | Wherever found |
| Spongilla sponginosa | Spongy sponge | Sponge, spongy | O006 | I01 | SC; | Spongillidae | NA | Sponges | 4 | Not Listed | 4 | US | I | Wherever found |
| Sporobolus pyramidatus | [Unnamed] dropseed | Dropseed, [unnamed] | Q1QD | P01 | AZ; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sporobolus teretifolius | Wireleaf dropseed | Dropseed, wireleaf | Q1QE | P01 | GA, NC, SC; | Poaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Sporobolus vaginiflorus var. ozarkanus | Bald grass | Grass, bald | Q1QC | P01 | AL, IL, IN, KY, LA, MO, MS, OK, TN, TX; | Poaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Sporophila insulata | Tumaco seedeater | Seedeater, Tumaco | B0B7 | V01 | Emberizidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Squatina squatina | Angel shark | shark, Angel | E0DD | V01 | Squatinidae | NA | Fishes | NMFS | Endangered | NA | Foreign | V | Entire | |
| Stachydeoma graveolens | Mock pennyroyal | Pennyroyal, mock | Q0XU | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Stachys hyssopifolia lythroides | Tallahassee hedge-nettle | Hedge-nettle, Tallahassee | Q1QF | P01 | FL; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Stactiobiella cahaba | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0OL | I01 | AL; | Hydroptilidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Stagnicola bonnevillensis | Fat-whorled (=Bonneville) pondsnail | Pondsnail, Fat-whorled (=Bonneville) | G0A1 | I01 | UT; | Lymnaeidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Stagnicola pilsbryi | Fish Springs marshsnail | Marshsnail, Fish Springs | G026 | I01 | UT; Believed to be extinct | Lymnaeidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Stagnicola utahensis | Thickshell pondsnail | Pondsnail, thickshell | G02Q | I01 | UT; Believed to be extinct | Lymnaeidae | NA | Snails | 6 | Not Listed | 6 | US | I | Wherever found |
| Stahlia monosperma | Cobana negra | Cobana negra | Q2JA | P01 | PR; Puerto Rico and Dominican Republic; U.S.A. (PR), Dominican Republic | Fabaceae | Apr 05, 1990 | Flowering Plants | 4 | Threatened | 4 | US/Foreign | P | Wherever found |
| Stallingsia maculosus | Maculated manfreda skipper | Skipper, maculated manfreda | I012 | I01 | TX; | Megathymidae | NA | Insects | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Stanleya pinnata gibberosa | No common name | No common name | Q1QG | P01 | WY; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Stebbinsoseris decipiens | Santa Cruz silverpuffs | Silverpuffs, Santa Cruz | Q17W | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Stellaria fontinalis | Water stitchwort | Stitchwort, water | Q03T | P01 | KY, TN; | Caryophyllaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Stellaria irrigua | Chickweed | Chickweed | Q1QH | P01 | CO, NM; U.S.S.R | Caryophyllaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6 | US | P | Wherever found |
| Stellula calliope | Calliope Hummingbird | Hummingbird, Calliope | B0K3 | V01 | Trochilidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Stenandrium fascicularis | No common name | No common name | Q1QI | P01 | TX; | Acanthaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Stenelmis calida calida | Devil's Hole warm spring riffle beetle | Riffle beetle, Devil's Hole warm spring | I0CH | I01 | NV; | Elmidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Stenelmis douglasensis | Douglas stenelmis riffle beetle | Riffle beetle, Douglas stenelmis | I0CJ | I01 | IN, MI, WI; | Elmidae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Stenelmis gammoni | Gammon's stenelmis riffle beetle | Riffle beetle, Gammon's stenelmis | I0CK | I01 | AL, NC, VA; | Elmidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Stenelmis moapa | Moapa warm springs riffle beetle | Riffle beetle, Moapa warm springs | I0CI | I01 | NV; | Elmidae | NA | Insects | 8 | Not Listed | 8 | US | I | Wherever found |
| Stenoderma rufum | Desmarest's fig-eating bat | Bat, Desmarest's fig-eating | A08D | V01 | PR, VI; | Phyllostomidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Stenogyne affinis degeneri | No common name | No common name | Q1QJ | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne angustifolia var. angustifolia | No common name | No common name | Q21Z | P01 | HI; | Lamiaceae | Nov 29, 1979 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne bifida | No common name | No common name | Q39K | P01 | HI; U.S.A. (HI) | Lamiaceae | Oct 08, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne campanulata | No common name | No common name | Q39L | P01 | HI; U.S.A. (HI) | Lamiaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne cinerea | No common name | No common name | Q1QK | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne cranwelliae | No common name | No common name | Q39M | P01 | HI; | Lamiaceae | Nov 29, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne haliakalae | No common name | No common name | Q1QM | P01 | HI; Possibly extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne kaalae ssp. sherffii | No common name | No common name | Q1QY | P01 | HI; ; Stenogyne kaalae subsp. sherffii, which is considered extinct in the wild, is known only from cultivated individuals that are expected to be outplanted for the purpose of reestablishing this species in the wild (Hawaii Plant Extinction Prevent Program (PEPP) 2014, in litt.). Due to the challenging logistics associated with conducting field work in Hawaii, it is possible additional occurrences exist in the wild, which have yet been surveyed. | Lamiaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne kanehoana | No common name | No common name | Q220 | P01 | HI; U.S.A. (HI) | Lamiaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne kauaulaensis | No common name | No common name | Q3O4 | P01 | HI; | Lamiaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne kealiae | No common name | No common name | Q3H8 | P01 | HI; U.S.A. (HI) | Lamiaceae | May 13, 2010 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stenogyne macrantha | No common name | No common name | Q1QO | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne microphylla | No common name | No common name | Q1QP | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne oxygona | No common name | No common name | Q1QQ | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne purpurea forbesii | No common name | No common name | Q1QR | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne rotundifolia | No common name | No common name | Q1QL | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne rotundifolia oblonga | No common name | No common name | Q1QS | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne rugosa | No common name | No common name | Q2JB | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne rugosa mollis | No common name | No common name | Q2JC | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne rugosa subulata | Ma`ohi`ohi | Ma`ohi`ohi | Q1QT | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne salicifolia | No common name | No common name | Q2JD | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne scrophularioides | No common name | No common name | Q1QZ | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne scrophularioides | No common name | No common name | Q1QU | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne scrophularioides | No common name | No common name | Q1QN | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne sessilis hexantha | No common name | No common name | Q1QV | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne sessilis laniensis | No common name | No common name | Q1QW | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne sessilis wilkesii | No common name | No common name | Q1QX | P01 | HI; | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenogyne viridis | No common name | No common name | Q1R0 | P01 | HI; Believed to be extinct | Lamiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Stenopelmatus cahuilaensis | Coachella Valley jerusalem cricket | Jerusalem cricket, Coachella Valley | I07J | I01 | CA; | Stenopelmatidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Stenopelmatus navajo | Navajo jerusalem cricket | Jerusalem cricket, Navajo | I07K | I01 | AZ; | Stenopelmatidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Stenopelmatus nigrocapitatus | Jacalitos Jerusalem cricket | Cricket, Jacalitos Jerusalem | I0SX | I01 | Stenopelmatidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Stenopelmatus spp | Colton Sand Dune Jerusalem cricket | Jerusalem cricket, Colton Sand Dune | I0S8 | I01 | Stenopelmatidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Stenotrema pilsbryi | Rich Mt. slitmouth | Slitmouth, Rich Mt. | G00M | I01 | AR, OK; | Polygyridae | NA | Snails | 4 | Not Listed | 2, 4 | US | I | Wherever found |
| Stenotrupis pritcharsdiae | Nihoa stenotrupis weevil | Weevil, Nihoa stenotrupis | I0G5 | I01 | HI; | Curculionidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Stephanomeria blairii | Blair's munzothamnus | Munzothamnus, Blair's | Q2R2 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Stephanomeria malheurensis | Malheur wire-lettuce | Wire-lettuce, Malheur | Q221 | P01 | OR; U.S.A. (OR) | Asteraceae | Nov 10, 1982 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Stephanomeria schottii | Schott's wire-lettuce | Wire-lettuce, Schott's | Q1R1 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Sterkia clementina | San Clemente Island blunt-top snail | Snail, San Clemente Island blunt-top | G03L | I01 | CA; | Pupillidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Sterna antillarum | Least tern | Tern, least | B07N | V01 | AR, CO, IA, IL, IN, KS, KY, LA, MO, MS, MT, ND, NE, NM, OK, SD, TN, TX, WY; | Laridae | May 28, 1985 | Birds | 4 | Endangered | 2, 3, 4, 6 | US | V | U.S.A. (AR, CO, IA, IL, IN, KS, KY, LA_Miss. R. and tribs. N of Baton Rouge, MS_Miss. R., MO, MT, ND, NE, NM, OK, SD, TN, TX_except within 50 miles of coast) |
| Sterna antillarum browni | California least tern | Tern, California least | B03X | V01 | AZ, CA; Entire | Laridae | Jun 02, 1970 | Birds | 8 | Endangered | 2, 8 | US/Foreign | V | Wherever found |
| Sterna dougallii dougallii | Roseate tern | Tern, roseate | B07O | V01 | CT, MA, ME, NC, NH, NJ, NY, RI, VA; Canada-(Newf,N.S,Que.) | Laridae | Nov 02, 1987 | Birds | 5 | Endangered | 4, 5 | US/Foreign | V | U.S.A. (Atlantic Coast south to NC), Canada (Newf., N.S, Que.), Bermuda |
| Sterna dougallii dougallii | Roseate tern | Tern, roseate | B07O | V02 | FL, PR, VI; Bermuda,Western Hemisphere and adjacent oceans and seas | Laridae | Nov 02, 1987 | Birds | 4 | Threatened | 4 | US/Foreign | V | Western Hemisphere and adjacent oceans, incl. U.S.A. (FL, PR, VI), where not listed as endangered |
| Sterna elegans | Elegant tern | Tern, elegant | B08T | V01 | CA; | Laridae | NA | Birds | 1 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Sterna hirundo | Common tern | Tern, common | B09G | V01 | IL, IN, MI, MN, NY, OH, PA, WI; | Laridae | NA | Birds | 3 | Not Listed | 3, 5 | US/Foreign | V | Wherever found |
| Sterna nilotica vanrossemi | Van Rossem's gull-billed tern | Tern, Van Rossem's gull-billed | B0AW | V01 | CA; | Laridae | NA | Birds | 8 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Sternotherus depressus | Flattened musk turtle | Turtle, flattened musk | C01Y | V01 | AL; Black Warrior R. system upstream from Bankhead Dam | Kinosternidae | Jun 11, 1987 | Reptiles | 4 | Threatened | 4 | US | V | Black Warrior R. system upstream from Bankhead Dam |
| Stictiella villegasi | Sand wasp | Wasp, sand | I0TI | I01 | Sphecidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Stillingia sylvatica tenuis | No common name | No common name | Q1R2 | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Stilosoma extenuatum | Short-tailed snake | Snake, short-tailed | C07C | V01 | FL; | Colubridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Stiobia nana | Sculpin snail | Snail, sculpin | G03M | I01 | AL; | Hydrobiidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Stipa lemmonii pubescens | Hairy Lemmon's needlegrass | Needlegrass, hairy Lemmon's | Q1R3 | P01 | CA; | Poaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Stizostedion vitreum glaucum | Blue pike | Pike, blue | E041 | V01 | MI, NY, OH, PA; Believed to be extinct | Percidae | Mar 11, 1967 | Fishes | 3 | Extinction | 3, 5 | US/Foreign | V | Wherever found |
| Stizostedion vitreum vitreum | Southeastern walleye | Walleye, southeastern | E09O | V01 | AL, FL, GA, MS, TN; | Percidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Mobile River Drainage |
| Stonemyia volutina | Volutine stonemyian tabanid fly | Tabanid fly, volutine stonemyian | I0EM | I01 | CA; Believed to be extinct | Tabanidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Storeria occipitomaculata pahasapae | Black Hills redbelly snake | Snake, Black Hills redbelly | C05E | V01 | SD, WY; | Colubridae | NA | Reptiles | 6 | Not Listed | 6 | US | V | Wherever found |
| Strepera graculina crissalis | Lord Howe pied currawong | Currawong, Lord Howe pied | B0DE | V01 | Cracticidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Streptanthus albidus peramoenus | Most beautiful jewelflower | Jewelflower, most beautiful | Q39N | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus albidus ssp. albidus | Metcalf Canyon jewelflower | Jewelflower, Metcalf Canyon | Q222 | P01 | CA; U.S.A. (CA) | Brassicaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Streptanthus batrachopus | Tamalpais jewelflower | Jewelflower, Tamalpais | Q1R4 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus bernardinus | Laguna Mountains jewelflower | Jewelflower, Laguna Mountains | Q2JF | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus brachiatus brachiatus | Contact Mine streptanthus | Streptanthus, Contact Mine | Q1R5 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus brachiatus hoffmanii | Freed's jewelflower | Jewelflower, Freed's | Q1R6 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus bracteatus | Bracted twistflower | Twistflower, bracted | Q1R7 | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Candidate | 2 | US | P | Wherever found |
| Streptanthus callistus | Mt. Hamilton jewelflower | Jewelflower, Mt. Hamilton | Q1R8 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus carinatus | No common name | No common name | Q1RK | P01 | AZ, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Streptanthus cordatus piutensis | Piute Mountains jewelflower | Jewelflower, Piute Mountains | Q1R9 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus cutleri | Cutler's twistflower | Twistflower, Cutler's | Q1RA | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Streptanthus farnsworthianus | Evalyn's jewelflower | Jewelflower, Evalyn's | Q1RL | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus fenestratus | Tehipite Valley jewelflower | Jewelflower, Tehipite Valley | Q1RM | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus glandulosus hoffmanii | Secund jewelflower | Jewelflower, secund | Q1RB | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus glandulosus pulchellus | Mount Tamalpais jewelflower | Jewelflower, Mount Tamalpais | Q1RN | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus gracilis | Alpine streptanthus | Streptanthus, alpine | Q1RO | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus hispidus | Mt. Diablo jewelflower | Jewelflower, Mt. Diablo | Q1RC | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus howellii | Howell's jewelflower | Jewelflower, Howell's | Q2JG | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Streptanthus insignis lyonii | Auburua Ranch jewelflower | Jewelflower, Auburua Ranch | Q2R3 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus lemmonii | Lemmon's jewelflower | Jewelflower, Lemmon's | Q1RD | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Streptanthus morrisonii elatus | Three Peaks jewelflower | Jewelflower, Three Peaks | Q1RE | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus morrisonii hirtiflorus | Dorr's Cabin jewelflower | Jewelflower, Dorr's Cabin | Q1RF | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus morrisonii kruckebergii | Kruckeberg's jewelflower | Jewelflower, Kruckeberg's | Q2R4 | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus morrisonii morrisonii | Morrison's jewelflower | Jewelflower, Morrison's | Q1RG | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus niger | Tiburon jewelflower | Jewelflower, Tiburon | Q223 | P01 | CA; U.S.A. (CA) | Brassicaceae | Feb 03, 1995 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Streptanthus oliganthus | Masonic Mountain jewelflower | Jewelflower, Masonic Mountain | Q1RH | P01 | CA, NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus sp. | Sp. nov. ined. (Pit River) jewelflower | Jewelflower, sp. nov. ined. (Pit River) | Q39O | P01 | CA; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Streptanthus sparsiflorus | Few-flowered jewelflower | Jewelflower, few-flowered | Q1RI | P01 | NM, TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Streptanthus squamiformis | [Unnamed] jewelflower | Jewelflower, [unnamed] | Q1RJ | P01 | AR, OK; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| streptocephalus thomasbowmani | bowman's fairy shrimp | No common name | K05V | I01 | streptocephalidae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Streptocephalus woottoni | Riverside fairy shrimp | Fairy shrimp, Riverside | K03F | I01 | CA; U.S.A. (CA) | Branchinectidae | Aug 03, 1993 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Streptopelia picturata rostrata | Seychelles turtle dove | Turtle dove, Seychelles | B0A7 | V01 | Columbidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Strigops habroptilus | Kakapo | Kakapo | B01W | V01 | New Zealand | Rhynochetidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Strix occidentalis caurina | Northern spotted owl | Owl, northern spotted | B08B | V01 | CA, OR, WA; Canada (B.C.); U.S.A. (WA, OR, CA) Canada (B.C.) | Strigidae | Jun 26, 1990 | Birds | 1 | Threatened | 1, 8 | US/Foreign | V | Wherever found |
| Strix occidentalis lucida | Mexican spotted owl | Owl, Mexican spotted | B074 | V01 | AZ, CO, NM, TX, UT; U.S.A. (UT, TX, NM, CO, AZ), Mexico | Strigidae | Mar 16, 1993 | Birds | 2 | Threatened | 2, 6 | US/Foreign | V | Wherever found |
| Strix occidentalis occidentalis | California spotted Owl | Owl, California spotted | B08L | V01 | CA, NV; | Strigidae | NA | Birds | 8 | Under Review in the Candidate or Petition Process | 8 | US | V | Wherever found |
| Stroganowia tiehmii | Tiehm's stroganowia | Stroganowia, Tiehm's | Q2WB | P01 | NV; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Struthio camelus spatzi | West African ostrich | Ostrich, West African | B025 | V01 | Spanish Sahara | Struthionidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Struthio camelus syriacus | Arabian ostrich | Ostrich, Arabian | B024 | V01 | Saudi Arabia, Jordan | Struthionidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Strymon acis bartrami | Bartram's hairstreak Butterfly | Butterfly, Bartram's hairstreak | I07G | I01 | FL; | Lycaenidae | Sep 11, 2014 | Insects | 4 | Endangered | 4 | US | I | Wherever found |
| Stygobromus (=Stygonectes) pecki | Peck's cave amphipod | Amphipod, Peck's cave | K019 | I01 | TX; U.S.A. (TX) | Crangonyctidae | Dec 18, 1997 | Crustaceans | 2 | Endangered | 2 | US | I | Wherever found |
| Stygobromus allegheniensis | Allegheny cave amphipod | Amphipod, Allegheny cave | K00A | I01 | MD, NY, PA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus araeus | Tidewater interstitial amphipod | Amphipod, tidewater interstitial | K01I | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus arizonensis | Arizona cave amphipod | Amphipod, Arizona cave | K00D | I01 | AZ; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus balconis | Balcones cave amphipod | Amphipod, Balcones cave | K00E | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus barri | Barr's cave amphipod | Amphipod, Barr's cave | K00F | I01 | MO; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus bifurcatus | Bifurcated cave amphipod | Amphipod, bifurcated cave | K00G | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus biggersi | Bigger's amphipod | Amphipod, Bigger's | K03H | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus bowmani | Bowman's cave amphipod | Amphipod, Bowman's cave | K00H | I01 | OK; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus carolinensis | Yancey sideswimmer | Sideswimmer, Yancey | K04H | I01 | NC; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus clantoni | Clanton's cave amphipod | Amphipod, Clanton's cave | K00L | I01 | KS, MO; | Crangonyctidae | NA | Crustaceans | 6 | Not Listed | 3, 6 | US | I | Wherever found |
| Stygobromus conradi | Burnsville Cove cave amphipod | Amphipod, Burnsville Cove cave | K001 | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus cooperi | Cooper's cave amphipod | Amphipod, Cooper's cave | K00M | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Stygobromus culveri | Culver's cave amphipod | Amphipod, Culver's cave | K02K | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus dejectus | Cascade Cave amphipod | Amphipod, Cascade Cave | K00I | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus elatus | Elevated Spring amphipod | Amphipod, Elevated Spring | K00O | I01 | AR; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus emarginatus | Greenbrier Cave amphipod | Amphipod, Greenbrier Cave | K00R | I01 | MD, WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus ephemerus | Ephemeral cave amphipod | Amphipod, Ephemeral cave | K003 | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus exilis | Central Kentucky cave amphipod | Amphipod, Central Kentucky cave | K00K | I01 | AL, KY, TN; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus flagellatus | Ezell's Cave amphipod | Amphipod, Ezell's Cave | K00P | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus franzi | Franz's amphipod | Amphipod, Franz's | K02L | I01 | MD; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus gracilipes | Shenandoah Valley cave amphipod | Amphipod, Shenandoah Valley cave | K01E | I01 | MD, PA, VA, WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus gradyi | Grady's cave amphipod | Amphipod, Grady's cave | K00Q | I01 | CA; | Crangonyctidae | NA | Crustaceans | 8 | Not Listed | 8 | US | I | Wherever found |
| Stygobromus hadenoecus | Devil's Sinkhole amphipod | Amphipod, Devil's Sinkhole | K00N | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus harai | Hara's cave amphipod | Amphipod, Hara's cave | K00S | I01 | CA; | Crangonyctidae | NA | Crustaceans | 8 | Not Listed | 8 | US | I | Wherever found |
| Stygobromus hayi | Hay's Spring amphipod | Amphipod, Hay's Spring | K004 | I01 | DC, MD; Entire | Crangonyctidae | Feb 05, 1982 | Crustaceans | 5 | Endangered | 5 | US | I | Wherever found |
| Stygobromus heteropodus | Pickle Springs amphipod | Amphipod, Pickle Springs | K01A | I01 | MO; Believed to be extinct | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus hoffmani | [Unnamed] amphipod | Amphipod, [unnamed] | K04J | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus hubbsi | Malheur Cave amphipod | Amphipod, Malheur Cave | K00Y | I01 | OR; | Crangonyctidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Stygobromus indentatus | Tidewater amphipod | Amphipod, tidewater | K007 | I01 | MD, NC, VA; | Crangonyctidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 4, 5 | US | I | Wherever found |
| Stygobromus iowae | Iowa amphipod | Amphipod, Iowa | K00U | I01 | IA; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus kenki | Kenk's amphipod | Amphipod, Kenk's | K04P | I01 | DC, MD, VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus longipes | Long-legged cave amphipod | Amphipod, long-legged cave | K00W | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus lucifugus | Rubious Cave amphipod | Amphipod, Rubious Cave | K01D | I01 | IL; Believed to be extinct | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus mackenziei | MacKenzie's cave amphipod | Amphipod, MacKenzie's cave | K00X | I01 | CA; | Crangonyctidae | NA | Crustaceans | 8 | Not Listed | 8 | US | I | Wherever found |
| Stygobromus mackini | Southwestern Virginia cave amphipod | Amphipod, Southwestern Virginia cave | K01F | I01 | TN, VA; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Stygobromus montanus | Mountain cave amphipod | Amphipod, mountain cave | K012 | I01 | AR; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus morrisoni | Morrison's cave amphipod | Amphipod, Morrison's cave | K011 | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Stygobromus mundus | Bath County cave amphipod | Amphipod, Bath County cave | K000 | I01 | VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus nanus | Pocahontas cave amphipod | Amphipod, Pocahontas cave | K02M | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus nortoni | Norton's cave amphipod | Amphipod, Norton's cave | K013 | I01 | TN; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus onondagaensis | Onondaga Cave amphipod | Amphipod, Onondaga Cave | K015 | I01 | MO; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus oregonensis | Oregon cave amphipod | Amphipod, Oregon cave | K016 | I01 | OR; | Crangonyctidae | NA | Crustaceans | 1 | Not Listed | 1 | US | I | Wherever found |
| Stygobromus ozarkensis | Ozark cave amphipod | Amphipod, Ozark cave | K017 | I01 | AR, MO, OK; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 2, 3, 4 | US | I | Wherever found |
| Stygobromus parvus | Minute cave amphipod | Amphipod, minute cave | K00Z | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Stygobromus phreaticus | Cave amphipod | Amphipod, cave | K04R | I01 | Crangonyctidae | NA | Crustaceans | NA | Not Listed | NA | I | Wherever found | ||
| Stygobromus pizzinii | Pizzini's amphipod | Amphipod, Pizzini's | K005 | I01 | DC, MD, PA, VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus putealis | Wisconsin well amphipod | Amphipod, Wisconsin well | K01K | I01 | WI; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus redactus | Redacted cave amphipod | Amphipod, redacted cave | K02N | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus reddelli | Redell's cave amphipod | Amphipod, Redell's cave | K01C | I01 | TX; | Crangonyctidae | NA | Crustaceans | 2 | Not Listed | 2 | US | I | Wherever found |
| Stygobromus smithi | Alabama well amphipod | Amphipod, Alabama well | K009 | I01 | AL; | Crangonyctidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Stygobromus spinatus | Spring Cave amphipod | Amphipod, Spring Cave | K01G | I01 | WV; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus stellmacki | Stellmack's cave amphipod | Amphipod, Stellmack's cave | K006 | I01 | PA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus subtilis | Subtle cave amphipod | Amphipod, subtle cave | K01H | I01 | IL, MO; | Crangonyctidae | NA | Crustaceans | 3 | Not Listed | 3 | US | I | Wherever found |
| Stygobromus tenuis potomacus | Potomac groundwater amphipod | Amphipod, Potomac groundwater | K01B | I01 | DC, MD, PA, VA; | Crangonyctidae | NA | Crustaceans | 5 | Not Listed | 5 | US | I | Wherever found |
| Stygobromus wengerorum | Wengerors' cave amphipod | Amphipod, Wengerors' cave | K01J | I01 | CA; | Crangonyctidae | NA | Crustaceans | 8 | Not Listed | 8 | US | I | Wherever found |
| Stygoparnus comalensis | Comal Springs dryopid beetle | Beetle, Comal Springs dryopid | I0MI | I01 | TX; U.S.A. (TX) | Dryopidae | Dec 18, 1997 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| Stylisma pickeringii | Pickering's morning-glory | Morning-glory, Pickering's | Q2R5 | P01 | AL, DE, GA, MS, NC, NJ, SC; | Convolvulaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Stylocline citroleum | No common name | No common name | Q3FT | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Stylocline masonii | No common name | No common name | Q3FU | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Stylurus notatus | Elusive clubtail | Clubtail, elusive | I0KT | I01 | AL, GA, IA, IL, IN, KY, MD, MI, MN, NY, OH, PA, TN, WI, WV; | Gomphidae | NA | Insects | 3 | Not Listed | 3, 4, 5 | US/Foreign | I | Wherever found |
| Stylurus potulentus | Yellow-sided clubtail | clubtail, Yellow-sided | I0WY | I01 | FL, MS; | Gomphidae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Stylurus townesi | Bronze clubtail | Clubtail, bronze | I05A | I01 | AL, FL, NC, SC, TN; | Gomphidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Styphelia tameiameiae hexamera | No common name | No common name | Q2JH | P01 | HI; | Epacridaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Styrax platanifolia stellata | [Unnamed] silverbells | Silverbells, [unnamed] | Q1RP | P01 | TX; | Styracaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Styrax platanifolius ssp. youngiae | Young's snowbell | Snowbell, Young's | Q1RQ | P01 | TX; | Styracaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Styrax portoricensis | Palo de jazmin | Palo de jazmin | Q2R6 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Styracaceae | Apr 22, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Styrax texanus | Texas snowbells | Snowbells, Texas | Q224 | P01 | TX; U.S.A. (TX) | Styracaceae | Oct 12, 1984 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Suaeda californica | California seablite | Seablite, California | Q3AF | P01 | CA; U.S.A. (CA) | Chenopodiaceae | Dec 15, 1994 | Flowering Plants | 8 | Endangered | 8 | US | P | Entire |
| Suaeda nigra | Hardtoe seepweed | Seepweed, hardtoe | Q1RR | P01 | TX; | Chenopodiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Suaeda rolandii | No common name | No common name | Q3FV | P01 | DE, NJ, NY; | Chenopodiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| suaeda taxifolia | Woolly seablite | seablite, Woolly | Q3KE | P01 | chenopodiaceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Succinea chittenangoensis | Chittenango ovate amber snail | Snail, Chittenango ovate amber | G00P | I01 | NY; Chittenango Falls State Park; U.S.A. (NY) | Succineidae | Aug 02, 1978 | Snails | 5 | Threatened | 5 | US | I | Wherever found |
| Succinea guamensis | [Unnamed] snail | Snail, [unnamed] | G0BP | I01 | GU; Possibly extinct | Succineidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Succinea piratarum | [Unnamed] snail | Snail, [unnamed] | G0BQ | I01 | GU; | Succineidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Succinea quadrasi | [Unnamed] snail | Snail, [unnamed] | G0BR | I01 | GU; | Succineidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Succinea sp. | Iowa Pleistocene Succineid | Succineid, Iowa Pleistocene | G05F | I01 | IA, MN; | Succineidae | NA | Snails | 3 | Not Listed | 3 | US | I | IA |
| Succinea sp. | Minnesota Pleistocene succineid | Succineid, Minnesota Pleistocene | G05G | I01 | IA, MN; | Succineidae | NA | Snails | 3 | Not Listed | 3 | US | I | MN |
| Sulcaria isidiisera | Splitting yarn lichen | Lichen, splitting yarn | U002 | P01 | CA; | Alectoriaceae | NA | Lichens | 1 | Not Listed | 8 | US | P | Wherever found |
| Sullivantia hapemanii | No common name | No common name | Q1RS | P01 | MT, WY; | Saxifragaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sullivantia oregana | No common name | No common name | Q1RT | P01 | OR, WA; | Saxifragaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sullivantia purpusii | No common name | No common name | Q2JI | P01 | CO; | Saxifragaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Sullivantia sullivantii | [Unnamed] sullivantia | Sullivantia, [unnamed] | Q1RU | P01 | IA, IN, KY, MN, MO, OH, VA, WI; | Saxifragaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Sus salvanius | Pygmy hog | Hog, pygmy | A019 | V01 | Nepal,Bhutan,India,Sikkim; Wherever found | Suidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Swallenia alexandrae | Eureka Dune grass | Grass, Eureka Dune | Q225 | P01 | CA; U.S.A. (CA) | Poaceae | May 27, 1978 | Flowering Plants | 8 | Threatened | 8 | US | P | Entire |
| Sylvilagus bachmani | brush rabbit | rabbit, brush | A0J5 | V01 | Leporidae | NA | Mammals | 1 | Not Listed | NA | US | V | Wherever found | |
| Sylvilagus bachmani riparius | Riparian brush rabbit | Rabbit, riparian brush | A0DN | V01 | CA; U.S.A. (CA) | Leporidae | Feb 23, 2000 | Mammals | 8 | Endangered | 8 | US | V | Wherever found |
| Sylvilagus floridanus ammophilus | Micco cottontail rabbit | Rabbit, Micco cottontail | A0DM | V01 | FL; | Leporidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Sylvilagus floridanus hitchensi | Smiths Island cottontail rabbit | Rabbit, Smiths Island cottontail | A0DO | V01 | VA; | Leporidae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Sylvilagus floridanus mearnsi | Eastern cottontail rabbit | Rabbit, eastern cottontail | A0KA | V01 | Leporidae | NA | Mammals | 3 | Not Listed | NA | US | V | Wherever found | |
| Sylvilagus floridanus robustus | Davis Mountains cottontail rabbit | Rabbit, Davis Mountains cottontail | A09A | V01 | TX; | Leporidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Sylvilagus obscurus | Appalachian cottontail rabbit | Rabbit, Appalachian cottontail | A0HD | V01 | VA; | Leporidae | NA | Mammals | 4 | Not Listed | 5 | US | V | Wherever found |
| Sylvilagus palustris hefneri | Lower Keys marsh rabbit | Rabbit, Lower Keys marsh | A0AA | V01 | FL; U.S.A. (FL) | Leporidae | Jun 21, 1990 | Mammals | 4 | Endangered | 4 | US | V | Wherever found |
| Sylvilagus transitionalis | New England cottontail | Cottontail, New England | A09B | V01 | ME, NY; | Leporidae | NA | Mammals | 5 | Not Listed | 5 | US | V | Wherever found |
| Symphalangus syndactylus | Siamang | Siamang | A066 | V01 | Malaysia, Indonesia | Pongidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Symphoricarpos guadalupensis | McKittrick snowberry | Snowberry, McKittrick | Q1RV | P01 | TX; | Caprifoliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Symphyotrichum chapmanii | Chapman's aster | Aster, Chapman's | Q2Z3 | P01 | AL, FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum depauperatum | Serpentine aster | Aster, serpentine | Q25O | P01 | DE, MD, NC, PA; | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Symphyotrichum dumosum | [Unnamed] aster | Aster, [unnamed] | Q04J | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum georgianum | Georgia aster | Aster, Georgia | Q2Z5 | P01 | AL, FL, GA, NC, SC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum hallii | [Unnamed] aster | Aster, [unnamed] | Q04P | P01 | OR, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Symphyotrichum jessicae | Jessica's aster | Aster, Jessica's | Q04Q | P01 | ID, WA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Symphyotrichum kralii | [Unnamed] aster | Aster, [unnamed] | Q04U | P01 | AL, FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum molle | [Unnamed] aster | Aster, [unnamed] | Q2XO | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Symphyotrichum plumosum | [Unnamed] aster | Aster, [unnamed] | Q04V | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum potosinum | [Unnamed] aster | Aster, [unnamed] | Q04S | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Symphyotrichum puniceum var. scabricaule | rough-stemmed aster | aster, rough-stemmed | Q04W | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Under Review in the Candidate or Petition Process | 2 | US | P | Entire |
| Symphyotrichum rhiannon | Buck Creek serpentine barren aster | aster, Buck Creek serpentine barren | Q3NE | P01 | NC; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Symphyotrichum X schistosum | [Unnamed] aster | Aster, [unnamed] | Q2N9 | P01 | VA; Possibly extinct | Asteraceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Symphyotrichum yukonense | Yukon aster | Aster, Yukon | Q25R | P01 | AK; Canada (Yukon) | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Synandra hispidula | [Unnamed] synandra | Synandra, [unnamed] | Q1RW | P01 | AL, IL, IN, KY, NC, OH, TN, VA, WV; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4, 5 | US | P | Wherever found |
| Synanthedon castaneae | Chestnut clearwing moth | Moth, chestnut clearwing | I0AN | I01 | AL, FL, GA, ME, MS, NC, NY, PA, SC, VA; | Sesiidae | NA | Insects | 4 | Not Listed | 4, 5 | US | I | Wherever found |
| Synaptomys borealis sphagnicola | Northern bog lemming | Lemming, northern bog | A0B9 | V01 | ME, NH; | Muridae | NA | Mammals | 5 | Under Review in the Candidate or Petition Process | 5 | US/Foreign | V | Wherever found |
| Synaptomys cooperi helaletes | Dismal Swamp (=southern bog) lemming | Lemming, Dismal Swamp (=southern bog) | A08U | V01 | NC, VA; | Muridae | NA | Mammals | 5 | Not Listed | 4, 5 | US | V | Wherever found |
| Synaptomys cooperi paludis | Kansas bog lemming | Lemming, Kansas bog | A0B7 | V01 | KS; Believed to be extinct | Muridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Synaptomys cooperi relictus | Nebraska bog lemming | Lemming, Nebraska bog | A0B8 | V01 | NE; Believed to be extinct | Muridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Syncaris pacifica | California freshwater shrimp | Shrimp, California freshwater | K01W | I01 | CA; U.S.A. (CA) | Palaemonidae | Oct 31, 1988 | Crustaceans | 8 | Endangered | 8 | US | I | Wherever found |
| Synthliboramphus hypoleucus | Xantus'sMurrelet | Murrelet, Xantus's | B098 | V01 | CA; Xantus's Murrelets breed on offshore islands of California and Mexico. Xantus's Murrelets disperse after breeding to offshore waters of British Columbia, Canada, Washington, Oregon, California, and Mexico. | Alcidae | NA | Birds | 8 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Synthyris canbyi | No common name | No common name | Q1RX | P01 | MT; | Scrophulariaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Synthyris missurica hirsuta | No common name | No common name | Q1RY | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Synthyris missurica stellata | No common name | No common name | Q1RZ | P01 | OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Synthyris pinnatifida canescens | No common name | No common name | Q1S0 | P01 | ID, MT; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1, 6 | US | P | Wherever found |
| Synthyris pinnatifida lanuginosa | No common name | No common name | Q1S1 | P01 | WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Synthyris platycarpa | No common name | No common name | Q1S2 | P01 | ID; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Synthyris ranunculina | [Unnamed] kittentails | Kittentails, [unnamed] | Q1S3 | P01 | NV; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Synthyris schizantha | No common name | No common name | Q1S4 | P01 | OR, WA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Sypheotides indica | Long-legged bustard | Bustard, long-legged | B0CC | V01 | Otididae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Syrmaticus ellioti | Elliot's pheasant | Pheasant, Elliot's | B05G | V01 | China | Phasianidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Syrmaticus humaie | Bar-tailed pheasant | Pheasant, bar-tailed | B02N | V01 | Myanmar (Burma), China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Syrmaticus mikado | Mikado pheasant | Pheasant, Mikado | B02T | V01 | Taiwan | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tabernaemontana rotensis | No common name | No common name | Q3H0 | P01 | GU, MP; | Apocynaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Tachybaptus rufolavatus | Alaotra Grebe | Grebe, Alaotra | B09R | V01 | Madagascar | Podicipedidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| tachycineta bicolor | Tree swallow | swallow, Tree | B0F1 | V01 | hirundinidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Taenidia montana | Mountain pimpernel | Pimpernel, mountain | Q39Q | P01 | MD, PA, VA, WV; | Apiaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Taeniopteryx starki | Leon River winter stonefly | Stonefly, Leon River winter | I0ED | I01 | TX; | Taeniopterygidae | NA | Insects | 2 | Not Listed | 2 | US | I | Wherever found |
| Tagetes lemmonii | No common name | No common name | Q1S5 | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Talanites ubicki | Ubick''s gnaphosid spider | Spider, Ubick''s gnaphosid | J01K | I01 | Gnaphosidae | NA | Arachnids | NA | Not Listed | NA | I | Wherever found | ||
| Talinum calcaricum | Limestone fameflower | Fameflower, limestone | Q1S7 | P01 | AL, KY, TN; | Portulacaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Talinum gooddingii | Goodding fameflower | Fameflower, Goodding | Q2JJ | P01 | AZ; | Portulacaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Talinum humile | Pinos Altos fameflower | Fameflower, Pinos Altos | Q2YA | P01 | AZ, NM; | Portulacaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Talinum marginatum | Tepic fameflower | Fameflower, Tepic | Q2R7 | P01 | AZ; | Portulacaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Talinum mengesii | [Unnamed] fameflower | Fameflower, [unnamed] | Q1S8 | P01 | AL, GA, TN; | Portulacaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Talinum rugospermum | Rough-seeded fameflower | Fameflower, rough-seeded | Q2WC | P01 | IA, IL, IN, KS, MN, NE, TX, WI; | Portulacaceae | NA | Flowering Plants | 3 | Not Listed | 2, 3, 6 | US | P | Wherever found |
| Talinum thompsonii | [Unnamed] fameflower | Fameflower, [unnamed] | Q39R | P01 | UT; | Portulacaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Talinum validulum | Tusayan fameflower | Fameflower, Tusayan | Q2WD | P01 | AZ; | Portulacaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tallaperla lobata | Lobed roachfly | roachfly, Lobed | I0X8 | I01 | VA; | Peltoperlidae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Tamias canipes | Gray-footed Chipmunk | Chipmunk, gray-footed | A0GU | V01 | NM, TX; | Sciuridae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Tamias minimus atristriatus | Penasco least chipmunk | Chipmunk, Penasco least | A08G | V01 | NM; Lincoln and Otero Counties, New Mexico | Sciuridae | NA | Mammals | 2 | Candidate | 2 | US | V | Wherever found |
| Tamias palmeri | Palmer's chipmunk | Chipmunk, Palmer's | A0AM | V01 | NV; | Sciuridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Tamias speciosus speciosus | Lodgepole chipmunk | Chipmunk, lodgepole | A0GV | V01 | CA; | Sciuridae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Tamias umbrinus sedulus | Mount Ellen Uinta chipmunk | Chipmunk, Mount Ellen Uinta | A0GW | V01 | UT; | Sciuridae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Tamiasciurus hudsonicus grahamensis | Mount Graham red squirrel | Squirrel, Mount Graham red | A09O | V01 | AZ; U.S.A. (AZ) | Sciuridae | Jun 03, 1987 | Mammals | 2 | Endangered | 2 | US | V | Wherever found |
| Tanacetum camphoratum | Dune tansy | Tansy, dune | Q1SA | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tanakia tanago | Miyako tango (=Toyko bitterling) | Tango, Miyako (=Toyko bitterling) | E00P | V01 | Japan | Cyprinidae | Jun 02, 1970 | Fishes | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tangara peruviana | Black-backed tanager | Tanager, black-backed | B0B5 | V01 | Emberizidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Tantilla oolitica | Rimrock crowned snake | Snake, Rimrock crowned | C042 | V01 | FL; | Colubridae | NA | Reptiles | 4 | Under Review in the Candidate or Petition Process | 4 | US | V | Wherever found |
| Taphius eucosmius eucosmius | Greenfield rams-horn | Rams-horn, Greenfield | G02S | I01 | NC; Believed to be extinct | Planorbidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Tapirus bairdii | Central American tapir | Tapir, Central American | A02H | V01 | Southern Mexico to Colombia and Ecuador | Tapiridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tapirus indicus | Asian tapir | Tapir, Asian | A068 | V01 | Burma, Laos, Cambodia, Vietnam, Malaysia, Indonesia, Thailand | Tapiridae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tapirus pinchaque | Mountain tapir | Tapir, mountain | A02I | V01 | Colombia,Ecuador and possibly Peru and Venezuela | Tapiridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tapirus terrestris | South American (=Brazilian) tapir | Tapir, South American (=Brazilian) | A02G | V01 | Colombia and Venezuela south to Paraguay and Argentina | Tapiridae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Taraxacum californicum | California taraxacum | Taraxacum, California | Q1SB | P01 | CA; U.S.A. (CA) | Asteraceae | Oct 14, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Taraxacum carneocoloratum | No common name | No common name | Q2WE | P01 | AK; Canada (Yukon) | Asteraceae | NA | Flowering Plants | 7 | Not Listed | 7 | US/Foreign | P | Wherever found |
| Tarenaya spinosa | Wild spiderflower | Spiderflower, wild | Q0G4 | P01 | HI; Believed to be extinct | Capparaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| taricha granulosa | Rough-skinned newt | newt, Rough-skinned | D03H | V01 | salamandridae | NA | Amphibians | 7 | Not Listed | NA | US | V | Wherever found | |
| taricha torosa ssp. torosa | Coast range newt | newt, Coast range | D03N | V01 | salamadridae | NA | Amphibians | 6 | Not Listed | NA | US | V | Wherever found | |
| Tarsius syrichta | Philippine tarsier | Tarsier, Philippine | A070 | V01 | Philippines | Tarsiidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| tartarocreagris | (Tartarocreagris) pseudoscorpion | pseudoscorpion, (Tartarocreagris) | J01Q | I01 | neobisiidae | NA | Arachnids | 6 | Not Listed | NA | US | I | Wherever found | |
| tartarocreagris intermedia | No common name | No common name | J030 | I01 | neobisiidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Tartarocreagris texana | Tooth Cave pseudoscorpion | Pseudoscorpion, Tooth Cave | J00A | I01 | TX; U.S.A. (TX) | Neobisiidae | Sep 16, 1988 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| Tauraco bannermani | Bannerman's turaco | Turaco, Bannerman's | B0A6 | V01 | Musophagidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Taurotragus derbianus derbianus | Western giant eland | Eland, western giant | A07J | V01 | Senegal to Ivory Coast | Bovidae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tauschia glauca | Glaucous tauschia | Tauschia, glaucous | Q1SC | P01 | CA, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Tauschia hooveri | Hoover's tauschia | Tauschia, Hoover's | Q1SD | P01 | WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tauschia howellii | Howell's tauschia | Tauschia, Howell's | Q1SE | P01 | CA, OR; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Tauschia stricklandii | No common name | No common name | Q1SF | P01 | OR, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tauschia tenuissima | No common name | No common name | Q2JK | P01 | ID, WA; | Apiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Taxidea taxus | American badger | badger, American | A0IY | V01 | mustelidae | NA | Mammals | 2 | Not Listed | NA | US | V | Wherever found | |
| Taxus brevifolia | Pacific yew | Yew, Pacific | R00F | P01 | Taxaceae | NA | Conifers and Cycads | NA | Not Listed | NA | P | Wherever found | ||
| Taxus floridana | Florida yew | Yew, Florida | R002 | P01 | FL; | Taxaceae | NA | Conifers and Cycads | 4 | Not Listed | 4 | US | P | Wherever found |
| Taylorconcha serpenticola | Bliss Rapids snail | Snail, Bliss Rapids | G01K | I01 | ID; U.S.A. (ID) | Hydrobiidae | Dec 14, 1992 | Snails | 1 | Threatened | 1 | US | I | Wherever found |
| Tectaria amesiana | No common name | No common name | S01M | P01 | FL; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Tectaria coriandrifolia | Hairy halberd fern | Fern, hairy halberd | S021 | P01 | FL; | Aspleniaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Tectaria estremerana | No common name | No common name | S01W | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Dryopteridaceae | Jun 09, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Teinopalpus imperialis | Kaiser-I-Hind swallowtail butterfly | Butterfly, Kaiser-I-Hind swallowtail | I0RR | I01 | Satyridae | NA | Insects | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | I | Wherever found | |
| Telema sp. | Santa Cruz telemid spider | Spider, Santa Cruz telemid | J005 | I01 | CA; | Telemidae | NA | Arachnids | 1 | Not Listed | 8 | US | I | Wherever found |
| Telespyza cantans | Laysan finch (honeycreeper) | Finch, Laysan (honeycreeper) | B009 | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Telespyza ultima | Nihoa finch (honeycreeper) | Finch, Nihoa (honeycreeper) | B00A | V01 | HI; U.S.A. (HI) | Drepanidinae | Mar 11, 1967 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Teloschistes villosus | No common name | No common name | Q3FW | P01 | CA; | Teloschistaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Tephrosia angustissima | No common name | No common name | Q2WG | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tephrosia mohrii | Pineland hoary-pea | Hoary-pea, pineland | Q2WH | P01 | AL, FL, GA; | Fabaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ternstroemia luquillensis | Palo colorado | Palo colorado | Q2JL | P01 | PR; Endemic to Puerto Rico. Known from El Yunque National Forest and Maricao Commonwealth Forest; U.S.A. (PR) | Theaceae | Apr 22, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Ternstroemia subsessilis | No common name | No common name | Q2JM | P01 | PR; Endemic to Puerto Rico. Known from El Yunque National Forest; U.S.A. (PR) | Theaceae | Apr 22, 1992 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Terpsiphone corvina | Seychelles paradise flycatcher | Flycatcher, Seychelles paradise | B01K | V01 | Indian Ocean-Seychelles | Tyrannidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Terrapene coahuila | Aquatic box turtle | Turtle, aquatic box | C00R | V01 | Mexico | Emydidae | Jun 04, 1973 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Testudo kleinmanni | Egyptian Tortoise | Tortoise, Egyptian | C07S | V01 | Egypt, Libya, Israel | Testudinidae | NA | Reptiles | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found |
| Tetracoccus dioicus | Parry's tetracoccus | Tetracoccus, Parry's | Q2WI | P01 | CA; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Tetracoccus ilicifolius | Holly-leaved tetracoccus | Tetracoccus, holly-leaved | Q2JN | P01 | CA; | Euphorbiaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tetramolopium arenarium | No common name | No common name | Q226 | P01 | HI; U.S.A. (HI) | Asteraceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tetramolopium capillare | Pamakani | Pamakani | Q227 | P01 | HI; U.S.A. (HI) | Asteraceae | Sep 30, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tetramolopium consanguineum consanguineum | No common name | No common name | Q22C | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium consanguineum leptophyllum | No common name | No common name | Q2WJ | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium conyzoides | No common name | No common name | Q22D | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium filiforme | No common name | No common name | Q228 | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tetramolopium humile sublaeve | No common name | No common name | Q2WK | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium kavaiensis koloana | No common name | No common name | Q2JO | P01 | HI; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium lepidotum arbusculum | No common name | No common name | Q2JP | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopium lepidotum ssp. lepidotum | No common name | No common name | Q229 | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tetramolopium remyi | No common name | No common name | Q22A | P01 | HI; U.S.A. (HI) | Asteraceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tetramolopium rockii | No common name | No common name | Q22B | P01 | HI; U.S.A. (HI) | Asteraceae | Oct 08, 1992 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Tetramolopium tenerrimum | No common name | No common name | Q22E | P01 | HI; Believed to be extinct | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetramolopius kavaiensis koloana | No common name | No common name | Q2JQ | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraneuris torreyana | No common name | No common name | Q2BJ | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Tetraneuris turneri | No common name | No common name | Q2BK | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tetraneuris verdiensis | Verde four-nerve daisy | Daisy, Verde four-nerve | Q3LK | P01 | AZ; | asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tetrao urogallus cantabricus | Cantabrian capercaillie | Capercaillie, Cantabrian | B0CM | V01 | Portugal, Spain | Gallinaceae | Sep 12, 2011 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tetraplasandra hawaiiensis hawaiiensis | No common name | No common name | Q2JR | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra hawaiiensis microcarpa | `Ohe | `Ohe | Q22H | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kaalae multiplex | `Ohe | `Ohe | Q22I | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kahanana | No common name | No common name | Q22J | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis dipyrena | `Ohe`ohe ) | `Ohe`ohe ) | Q22K | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis grandis | `Ohe`ohe | `Ohe`ohe | Q22L | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis intercedens | `Ohe`ohe e | `Ohe`ohe e | Q22M | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis koloana | `Ohe`ohe | `Ohe`ohe | Q2JS | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis nahikuensis | `Ohe`ohe s | `Ohe`ohe s | Q22N | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kavaiensis occidua | `Ohe`ohe | `Ohe`ohe | Q22O | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra kohalae | No common name | No common name | Q22P | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra lanaiensis | No common name | No common name | Q22Q | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra lihuensis gracilipes | No common name | No common name | Q2JT | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra bisobtusa | No common name | No common name | Q2JU | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra bryanii | No common name | No common name | Q22S | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra degeneri | No common name | No common name | Q22T | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra hillebrandii | No common name | No common name | Q22U | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra hiloensis | No common name | No common name | Q2JV | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra leptomera | No common name | No common name | Q22V | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra makalehana | No common name | No common name | Q22W | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra rhynchocarpoides | No common name | No common name | Q2JW | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra meiandra simulans | No common name | No common name | Q2JX | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra munroi | No common name | No common name | Q22X | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra oahuensis eradiata | No common name | No common name | Q22Y | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra oahuensis fauriei | No common name | No common name | Q2JY | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra oahuensis hailiensis | No common name | No common name | Q2JZ | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra oahuensis longipes | No common name | No common name | Q2K0 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra oahuensis pseudorhachis | No common name | No common name | Q2K1 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra pupukeensis nitida | No common name | No common name | Q2K2 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra pupukeensis pupukeensis | No common name | No common name | Q22Z | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra pupukeensis venosa | No common name | No common name | Q2K3 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra turbans | No common name | No common name | Q2K4 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra waialealae urceolata | No common name | No common name | Q2K5 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra waianensis | Wai`anae tetraplasandra | Tetraplasandra, Wai`anae | Q230 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetraplasandra waimeae angustior | No common name | No common name | Q2K6 | P01 | HI; | Araliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Tetrix sierrana | Sierra pygmy grasshopper | Grasshopper, Sierra pygmy | I07D | I01 | CA; | Tetrigidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Tettigidea empedonepia | Torreya pygmy grasshopper | Grasshopper, Torreya pygmy | I07E | I01 | FL; | Tetrigidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Texamaurops reddelli | Kretschmarr Cave mold beetle | Beetle, Kretschmarr Cave mold | I0IA | I01 | TX; U.S.A. (TX) | Pselaphidae | Sep 16, 1988 | Insects | 2 | Endangered | 2 | US | I | Wherever found |
| texella | New Comanche Trail cave harvestman | harvestman, New Comanche Trail cave | J01R | I01 | phalangodidae | NA | Arachnids | 6 | Not Listed | NA | US | I | Wherever found | |
| texella brevidenta | No common name | No common name | J031 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| texella brevistyla | No common name | No common name | J032 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Texella cokendolpheri | Cokendolpher Cave Harvestman | Harvestman, Cokendolpher Cave | J016 | I01 | TX; U.S.A. (TX) | Phalangodidae | Dec 26, 2000 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| texella diplospina | No common name | No common name | J033 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| texella fendi | No common name | No common name | J034 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| texella grubbsi | No common name | No common name | J036 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| texella hardeni | No common name | No common name | J035 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Texella reddelli | Bee Creek Cave harvestman | Harvestman, Bee Creek Cave | J008 | I01 | TX; U.S.A. (TX) | Phalangodidae | Sep 16, 1988 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| texella renkesae | No common name | No common name | J037 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Texella reyesi | Bone Cave harvestman | Harvestman, Bone Cave | J009 | I01 | TX; U.S.A. (TX) | Phalangodidae | Sep 16, 1988 | Arachnids | 2 | Endangered | 2 | US | I | Wherever found |
| texella welbourni | No common name | No common name | J038 | I01 | phalangodidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| texiweckelia relicta | No common name | No common name | K05W | I01 | hadziidae | NA | Crustaceans | 2 | Not Listed | NA | US | I | Wherever found | |
| Texosporium sancti-jacobi | [Unnamed] lichen | Lichen, [unnamed] | U004 | P01 | CA, ID, OR; | Cypheliaceae | NA | Lichens | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Thaleichthys pacificus | Columbia River smelt | Smelt, Columbia River | E0A4 | V01 | Osmeroidei | NA | Fishes | NMFS | Not Listed | NA | US | V | Wherever found | |
| Thaleichthys pacificus | Eulachon | Eulachon | E0BJ | V01 | Eastern Pacific Ocean, from northern California to southwestern Alaska and into the southeastern Bering Sea | Osmeridae | Apr 13, 2011 | Fishes | NMFS | Threatened | NA | US | V | Southern DPS - See 50 CFR 223.102 |
| Thalictrum arkansanum | No common name | No common name | Q39T | P01 | AR, OK, TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2, 4 | US | P | Wherever found |
| Thalictrum cooleyi | Cooley's meadowrue | Meadowrue, Cooley's | Q231 | P01 | FL, GA, NC; U.S.A. (NC, FL) | Ranunculaceae | Feb 07, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Thalictrum coriaceum | Steele's meadowrue | Meadowrue, Steele's | Q2R9 | P01 | DC, MD, PA, VA, WV; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Thalictrum debile | Southern meadowrue | meadowrue, Southern | Q2K7 | P01 | AL, GA, MS; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Thalictrum heliophilum | No common name | No common name | Q2R8 | P01 | CO; | Ranunculaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Thalictrum macrostylum | No common name | No common name | Q39U | P01 | AL, FL, GA, SC; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Thalictrum macrostylum | Piedmont meadow-rue | Meadow-rue, Piedmont | Q3MH | P01 | NC; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Thalictrum mirabile | No common name | No common name | Q3FY | P01 | AL, KY, TN; | Ranunculaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Thalictrum texanum | Houston meadowrue | Meadowrue, Houston | Q2RA | P01 | TX; | Ranunculaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| thalkethops grallatrix | No common name | No common name | H002 | I01 | cryptopidae | NA | Millipedes | 2 | Not Listed | NA | US | I | Wherever found | |
| Thamnophis brachystoma | Short-headed garter snake | Snake, short-headed garter | C043 | V01 | NY, PA; | Colubridae | NA | Reptiles | 5 | Not Listed | 5 | US | V | Wherever found |
| Thamnophis eques megalops | Northern Mexican gartersnake | gartersnake, northern Mexican | C04Q | V01 | AZ, NM; | Colubridae | Jul 08, 2014 | Reptiles | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Thamnophis gigas | Giant garter snake | Snake, giant garter | C057 | V01 | CA; U.S.A. (CA) | Colubridae | Oct 20, 1993 | Reptiles | 8 | Threatened | 8 | US | V | Wherever found |
| Thamnophis hammondii | Two-striped garter snake | Snake, two-striped garter | C05K | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Thamnophis rufipunctatus | Narrow-headed gartersnake | gartersnake, narrow-headed | C051 | V01 | AZ, NM; | Colubridae | Jul 08, 2014 | Reptiles | 2 | Threatened | 2 | US/Foreign | V | Wherever found |
| Thamnophis sauritus | Eastern Ribbon snake | snake, Eastern Ribbon | C07Y | V01 | FL; | Colubridae | NA | Reptiles | 4 | Not Listed | 4 | US | V | Wherever found |
| Thamnophis sirtalis annectens | Texas garter snake | Snake, Texas garter | C053 | V01 | KS, OK, TX; | Colubridae | NA | Reptiles | 2 | Not Listed | 2, 6 | US | V | Wherever found |
| Thamnophis sirtalis ssp. | South coast garter snake | Snake, South coast garter | C062 | V01 | CA; | Colubridae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Thamnophis sirtalis tetrataenia | San Francisco garter snake | Snake, San Francisco garter | C002 | V01 | CA; U.S.A. (CA) | Colubridae | Mar 11, 1967 | Reptiles | 8 | Endangered | 8 | US | V | Wherever found |
| Thaspium pinnatifidum | mountain thaspium | thaspium, mountain | Q3NG | P01 | NC; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Thaumatogryllus cavicola | Volcanoes cave cricket | Cricket, Volcanoes cave | I05Q | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Thaumatogryllus variegatus | Kauai thinfooted bush cricket | Cricket, Kauai thinfooted bush | I05I | I01 | HI; | Gryllidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Thelesperma caespitosum | No common name | No common name | Q3FZ | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Thelesperma pubescens | No common name | No common name | Q2WL | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Thelesperma subnudum alpinum | No common name | No common name | Q2WM | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Theliopsyche tallapoosa | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0OM | I01 | AL; | Lepidostomatidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Thelocactus bicolor flavidispinus | No common name | No common name | Q2WN | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Thelypodiopsis purpusii | No common name | No common name | Q1PC | P01 | AZ; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Thelypodiopsis purpusii | No common name | No common name | Q2KD | P01 | NM; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Thelypodium brachycarpum | Short-podded thelypody | Thelypody, short-podded | Q2K8 | P01 | CA, OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Thelypodium eucosmum | No common name | No common name | Q2RB | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Thelypodium howellii ssp. spectabilis | Howell''s spectacular thelypody | Thelypody, Howell''s spectacular | Q2K9 | P01 | OR; U.S.A. (OR) | Brassicaceae | May 26, 1999 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Thelypodium laxiflorum | No common name | No common name | Q2KA | P01 | AZ, CO, NV, UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 2, 6, 8 | US | P | Wherever found |
| Thelypodium repandum | Jaeger's thelypody | Thelypody, Jaeger's | Q2WO | P01 | ID; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Thelypodium sagittatum ovalifolium | No common name | No common name | Q2KC | P01 | NV, UT; | Brassicaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Thelypodium stenopetalum | Slender-petaled mustard | Mustard, slender-petaled | Q2KB | P01 | CA; U.S.A. (CA) | Brassicaceae | Aug 31, 1984 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Thelypodium tenue | Fresno Creek thelypody | Thelypody, Fresno Creek | Q2WP | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Thelypodium texanum | [Unnamed] thelypody | Thelypody, [unnamed] | Q232 | P01 | TX; | Brassicaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Thelypteris hastata heterodoxa | No common name | No common name | S027 | P01 | PR, VI; | Thelypteridaceae | NA | Ferns and Allies | 4 | Not Listed | 4 | US | P | Wherever found |
| Thelypteris inabonensis | No common name | No common name | S01Y | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Thelypteridaceae | Jul 02, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Thelypteris pilosa var. alabamensis | Alabama streak-sorus fern | Fern, Alabama streak-sorus | S01N | P01 | AL; U.S.A. (AL) | Thelypteridaceae | Jul 08, 1992 | Ferns and Allies | 4 | Threatened | 4 | US | P | Wherever found |
| Thelypteris verecunda | No common name | No common name | S01Z | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Thelypteridaceae | Jul 02, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Thelypteris yaucoensis | No common name | No common name | S020 | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Thelypteridaceae | Jul 02, 1993 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| Thermopsis macrophylla agnina | Santa Barbara false-lupine | False-lupine, Santa Barbara | Q2RC | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Thermopsis macrophylla semota | Velvety false-lupine | False-lupine, velvety | Q2WQ | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Thermosphaeroma thermophilus | Socorro isopod | Isopod, Socorro | K01Y | I01 | NM; U.S.A. (NM) | Sphaeromatidae | Apr 26, 1978 | Crustaceans | 2 | Endangered | 2 | US | I | Wherever found |
| Theropithecus gelada | Gelada baboon | Baboon, gelada | A06B | V01 | Northern Ethiopia | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Thinornis novaeseelandiae | New Zealand shore plover | Plover, New Zealand shore | B030 | V01 | New Zealand | Charadriidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Thismia americana | No common name | No common name | Q2WR | P01 | IL; Possibly extinct | Burmanniaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Thlaspi arcticum | No common name | No common name | Q2KE | P01 | AK; Canada (B.C,Yukon) | Brassicaceae | NA | Flowering Plants | 7 | Not Listed | 7 | US | P | Wherever found |
| Thlaspi californicum | Kneeland Prairie penny-cress | Penny-cress, Kneeland Prairie | Q2KF | P01 | CA; U.S.A. (CA) | Brassicaceae | Feb 09, 2000 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Thlaspi montanum siskiyouense | No common name | No common name | Q2KG | P01 | OR; | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Thoburnia atripinnis | Blackfin sucker | sucker, Blackfin | E0CZ | V01 | KY, TN; | Catostomidae | NA | Fishes | 4 | Not Listed | 4 | US | V | Wherever found |
| Thoburnia hamiltoni | Rustyside sucker | Sucker, rustyside | E01Q | V01 | VA; | Catostomidae | NA | Fishes | 5 | Not Listed | 5 | US | V | Wherever found |
| Thomomys clusius | Wyoming pocket gopher | pocket gopher, Wyoming | A0J4 | V01 | WY; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys mazama couchi | Shelton pocket gopher | Pocket gopher, Shelton | A0IC | V01 | WA; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys mazama douglasii | Brush Prairie pocket gopher | pocket gopher, Brush Prairie | A0J2 | V01 | WA; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys mazama glacialis | Roy Prairie pocket gopher | Pocket gopher, Roy Prairie | A0CP | V01 | WA; | Geomyidae | May 09, 2014 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Thomomys mazama helleri | Goldbeach western pocket gopher | Pocket gopher, Goldbeach western | A0CQ | V01 | OR; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys mazama louiei | Louie's pocket gopher | Pocket gopher, Louie's | A0CR | V01 | WA; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys mazama melanops | Olympic pocket gopher | Pocket gopher, Olympic | A0ID | V01 | WA; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys mazama pugetensis | Olympia pocket gopher | Pocket gopher, Olympia | A0IE | V01 | WA; U.S.A (WA) | Geomyidae | May 09, 2014 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Thomomys mazama tacomensis | Tacoma western pocket gopher | Pocket gopher, Tacoma western | A0CS | V01 | Possibly extinct | Geomyidae | NA | Mammals | 1 | Not Listed | NA | US | V | Wherever found |
| Thomomys mazama tumuli | Tenino pocket gopher | Pocket gopher, Tenino | A0IF | V01 | WA; | Geomyidae | May 09, 2014 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Thomomys mazama yelmensis | Yelm pocket gopher | Pocket gopher, Yelm | A0IG | V01 | WA; | Geomyidae | May 09, 2014 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Thomomys talpoides macrotis | Douglas County pocket gopher | pocket gopher, Douglas County | A0IH | V01 | Geomyidae | NA | Mammals | 6 | Not Listed | NA | US | V | Wherever found | |
| Thomomys umbrinus abstrusus | Fish Spring pocket gopher | Pocket gopher, Fish Spring | A0CT | V01 | NV; | Geomyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Thomomys umbrinus amargosae | Amargosa southern pocket gopher | Pocket gopher, Amargosa southern | A0DG | V01 | CA; | Geomyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Thomomys umbrinus bonnevillei | Bonneville southern pocket gopher | Pocket gopher, Bonneville southern | A0CU | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus convexus | Clear Lake pocket gopher | Pocket gopher, Clear Lake | A0CV | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus curtatus | San Antonio pocket gopher | Pocket gopher, San Antonio | A0CW | V01 | NV; | Geomyidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Thomomys umbrinus detumidus | Pistol River pocket gopher | Pocket gopher, Pistol River | A0CX | V01 | OR; | Geomyidae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Thomomys umbrinus dissimilis | Mount Ellen pocket gopher | Pocket gopher, Mount Ellen | A0CY | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus emotus | Animas southern pocket gopher | Pocket gopher, Animas southern | A0DH | V01 | NM; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus grahamensis | Graham Mountains pocket gopher | Pocket gopher, Graham Mountains | A0DI | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus guadalupensis | Guadalupe southern pocket gopher | Pocket gopher, Guadalupe southern | A0CZ | V01 | NM, TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus hualpaiensis | Hualapai southern pocket gopher | Pocket gopher, Hualapai southern | A0D0 | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus limpiae | Limpia southern pocket gopher | Pocket gopher, Limpia southern | A0D1 | V01 | TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus mearnsi | Mearns' southern pocket gopher | Pocket gopher, Mearns' southern | A0D2 | V01 | NM; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus minimus | Stansbury Island pocket gopher | Pocket gopher, Stansbury Island | A0D3 | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus muralis | Prospect Valley pocket gopher | Pocket gopher, Prospect Valley | A0D4 | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus nesophilus | Antelope Island pocket gopher | Pocket gopher, Antelope Island | A0D5 | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus paguatae | Cebolleta southern pocket gopher | Pocket gopher, Cebolleta southern | A0D6 | V01 | NM; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus powelli | Salt Gulch pocket gopher | Pocket gopher, Salt Gulch | A0D7 | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus quercinus | Pajarito southern pocket gopher | Pocket gopher, Pajarito southern | A0D8 | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus robustus | Skull Valley pocket gopher | Pocket gopher, Skull Valley | A0D9 | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus sevieri | Swasey Spring pocket gopher | Pocket gopher, Swasey Spring | A0DA | V01 | UT; | Geomyidae | NA | Mammals | 6 | Not Listed | 6 | US | V | Wherever found |
| Thomomys umbrinus suboles | Searchlight southern pocket gopher | Pocket gopher, Searchlight southern | A0DB | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus subsimilis | Harquahala southern pocket gopher | Pocket gopher, Harquahala southern | A0DC | V01 | AZ; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Thomomys umbrinus texensis | Limpia Creek pocket gopher | Pocket gopher, Limpia Creek | A0DD | V01 | TX; | Geomyidae | NA | Mammals | 2 | Not Listed | 2 | US | V | Wherever found |
| Threnetes grzimeki | Black barbthroat | Barbthroat, black | B0D0 | V01 | Trochilidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Thryomanes bewickii altus | Appalachian Bewick's wren | Wren, Appalachian Bewick's | B07Y | V01 | VA; | Troglodytidae | NA | Birds | 5 | Not Listed | 5 | US/Foreign | V | Wherever found |
| Thryomanes bewickii leucophrys | San Clemente Bewick's wren | Wren, San Clemente Bewick's | B07Z | V01 | CA; Believed to be extinct | Troglodytidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Thryothorus nicefori | Niceforo's wren | Wren, Niceforo's | B0BB | V01 | Troglodytidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Thylacinus cynocephalus | Tasmanian tiger | Tiger, Tasmanian | A02J | V01 | Australia | Felidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Thymallus arcticus | Arctic grayling | Grayling, arctic | E03Q | V01 | MT; | Salmonidae | NA | Fishes | 6 | Not Listed | 6 | US | V | Upper Missouri River DPS |
| thymoites minero | No common name | No common name | J039 | I01 | theridiidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Thymophylla tephroleuca | Ashy dogweed | Dogweed, ashy | Q1SH | P01 | TX; U.S.A. (TX) | Asteraceae | Jul 19, 1984 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Thyrocopa apatela | Haleakala flightless thyrocopa moth | Moth, Haleakala flightless thyrocopa | I0PU | I01 | HI; | Oecophoridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Thyrocopa sapindiella | Oahu aulu thyrocopa moth | Moth, Oahu aulu thyrocopa | I0PW | I01 | HI; Possibly extinct,not reported since 1965 | Oecophoridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Thysanocarpus conchuliferus | Santa Cruz Island fringepod | Fringepod, Santa Cruz Island | Q2KH | P01 | CA; U.S.A. (CA) | Brassicaceae | Jul 31, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Tiaroga cobitis | Loach minnow | Minnow, loach | E03X | V01 | AZ, NM; U.S.A. (NM, AZ), Mexico | Cyprinidae | Oct 28, 1986 | Fishes | 2 | Endangered | 2 | US/Foreign | V | Wherever found |
| Tijuca condita | Grey-winged cotinga | Cotinga, grey-winged | B0BH | V01 | Tyrannidae | NA | Birds | NA | Not Listed | NA | V | Wherever found | ||
| Tillandsia baileyi | Bailey's ballmoss | Ballmoss, Bailey's | Q39V | P01 | TX; | Bromeliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Tillandsia lineatispica | Pinon | Pinon | Q2KI | P01 | PR, VI; | Bromeliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tinamus solitarius | Solitary tinamou | Tinamou, solitary | B05P | V01 | Argentina, Brazil, Paraguay | Tinamidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tinodes siskiyou | Siskiyou caddisfly | Caddisfly, Siskiyou | I04B | I01 | OR; | Psychomyiidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Tinospora homosepala | No common name | No common name | Q3SH | P01 | GU; | Menispermaceae | Nov 02, 2015 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Tinostoma smaragditis | Fabulous green sphinx Moth | Moth, fabulous green sphinx | I0AP | I01 | HI; | Sphingidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Tischeria perplexa | Chestnut leaf miner | Leaf miner, chestnut | I081 | I01 | VA; Possibly extinct,not reported since 1965 | Tischeriidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Tithonia thurberi | No common name | No common name | Q2KJ | P01 | AZ; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tofieldia glabra | Smooth bog-asphodel | Bog-asphodel, smooth | Q39W | P01 | GA, NC, SC; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tofieldia glutinosa absona | No common name | No common name | Q233 | P01 | ID; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Toiyabea alpina | No common name | No common name | Q2TZ | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Toltecus chihuanus | [Unnamed] millipede | Millipede, [unnamed] | H000 | I01 | NM; | Atopetholidae | NA | Millipedes | 2 | Not Listed | 2 | US/Foreign | I | Wherever found |
| Tomanthera caddoensis | Caddo purple false-foxglove | False-foxglove, Caddo purple | Q3G3 | P01 | LA; Possibly extinct | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tomanthera pseudaphylla | Shinner's false-foxglove | False-foxglove, Shinner's | Q3G4 | P01 | AL, MS, TN; | Scrophulariaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tomanthera skinneriana | Purple false-foxglove | False-foxglove, purple | Q3G5 | P01 | IA, IL, IN, KS, KY, LA, MI, MO, OH, WI; | Scrophulariaceae | NA | Flowering Plants | 3 | Not Listed | 3, 4, 6 | US | P | Wherever found |
| Tomistoma schlegelii | Tomistoma | Tomistoma | C01B | V01 | Malaysia, Indonesia | Crocodylidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tonestus eximius | Tahoe haplopappus | Haplopappus, Tahoe | Q2AT | P01 | CA, NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tonestus graniticus | No common name | No common name | Q33U | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Torreya taxifolia | Florida torreya | Torreya, Florida | R006 | P01 | FL, GA; U.S.A. (GA, FL) | Taxaceae | Jan 23, 1984 | Conifers and Cycads | 4 | Endangered | 4 | US | P | Wherever found |
| Tortula ammonsiana | Ammon's tortula | Tortula, Ammon's | Q39X | P01 | NC, TN, WV; | Pottiaceae | NA | Flowering Plants | 4 | Not Listed | 4, 5 | US | P | Wherever found |
| Townsendia alpigena minima | No common name | No common name | Q2KK | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Townsendia aprica | Last Chance townsendia | Townsendia, Last Chance | Q234 | P01 | UT; U.S.A. (UT) | Asteraceae | Aug 21, 1985 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Townsendia jonesii lutea | [Unnamed] townsendia | Townsendia, [unnamed] | Q39Z | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Townsendia jonesii tumulosa | No common name | No common name | Q2KL | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Townsendia mensana | [Unnamed] townsendia | Townsendia, [unnamed] | Q2KM | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Townsendia rothrockii | [Unnamed] townsendia | Townsendia, [unnamed] | Q2KN | P01 | CO; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Townsendia sp. | Sp. nov. ined. (Nye Co.) townsendia | Townsendia, sp. nov. ined. (Nye Co.) | Q2KO | P01 | NV; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Nye Co. |
| Townsendia sp. | Sp. nov. ined. (WY) townsendia | Townsendia, sp. nov. ined. (WY) | Q2WS | P01 | WY; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 6 | US | P | WY |
| Townsendia sp. | Sp. nov. ined. (gypsum) townsendia | Townsendia, sp. nov. ined. (gypsum) | Q3G6 | P01 | NM; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | NM |
| Townsendia spathulata | Sword townsendia | Townsendia, sword | Q2KP | P01 | WY; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Toxolasma corvunculus | Southern Purple Lilliput | Lilliput, Southern Purple | F055 | I01 | Unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | NA | US | I | Wherever found | |
| Toxolasma cylindrellus | Pale lilliput (pearlymussel) | Lilliput, pale (pearlymussel) | F00B | I01 | AL, TN; U.S.A. (TN, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Toxolasma lividus | Purple lilliput | Lilliput, purple | F02P | I01 | IL, IN, KY, MI, MO, OH, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 3, 4 | US | I | Wherever found |
| Toxolasma pullus | Savannah lilliput | Lilliput, Savannah | F02Q | I01 | GA, NC; | Unionidae | NA | Clams | 4 | Not Listed | 4 | US | I | Wherever found |
| Toxostoma bendirei | Bendire's Thrasher | Thrasher, Bendire's | B0IF | V01 | Mimidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| toxostoma crissale | Crissal thrasher | thrasher, Crissal | B0EK | V01 | mimidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| toxostoma lecontei | Le Conte's thrasher | thrasher, Le Conte's | B0GE | V01 | Mimidae | NA | Birds | 8 | Not Listed | NA | US | V | Wherever found | |
| Toxostoma lecontei macmillanorum | San Joaquin LeConte's thrasher | Thrasher, San Joaquin LeConte's | B0AX | V01 | CA; | Mimidae | NA | Birds | 1 | Not Listed | 8 | US | V | Wherever found |
| Trachemys scripta callirostris | South American red-lined turtle | Turtle, South American red-lined | C04J | V01 | Venezuela, Colombia | Emydidae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trachemys stejnegeri malonei | Inagua Island turtle | Turtle, Inagua Island | C04I | V01 | Bahamas (Great Inagua Island) | Emydidae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trachemys terrapen | Cat Island turtle | Turtle, Cat Island | C04G | V01 | Cat Island in the Bahamas; West Indies-Jamaica, Bahamas | Emydidae | Sep 30, 1991 | Reptiles | Foreign | Endangered | NA | Foreign | V | Cat Island in the Bahamas |
| Trachypithecus (=Presbytis) francoisi | Francois' langur | Langur, Francois' | A06G | V01 | China (Kwangsi),Indochina | Cercopithecidae | Oct 19, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trachypithecus (=Presbytis) geei | Golden langur | Langur, golden | A05N | V01 | India (Assam),Bhutan | Cercopithecidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trachypithecus (=Presbytis) pileatus | Capped Langur | Langur, capped | A05L | V01 | India,Burma,Bangladesh | Cercopithecidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tracyina rostrata | Beaked tracyina | Tracyina, beaked | Q235 | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tradescantia edwardsiana | No common name | No common name | Q2KQ | P01 | TX; | Commelinaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tradescantia ozarkana | No common name | No common name | Q2WT | P01 | AR, MO, OK; | Commelinaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Tradescantia wrightii | Wright's spiderwort | Spiderwort, Wright's | Q2KR | P01 | NM, TX; | Commelinaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tragia nigricans | No common name | No common name | Q2KS | P01 | TX; | Euphorbiaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tragia saxicola | No common name | No common name | Q2KT | P01 | FL; | Euphorbiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Tragopan blythii | Blyth's tragopan pheasant | Pheasant, Blyth's tragopan | B02O | V01 | Myanmar (Burma), India, China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tragopan caboti | Cabot's tragopan pheasant | Pheasant, Cabot's tragopan | B02Q | V01 | China | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Tragopan melanocephalus | Western tragopan pheasant | Pheasant, western tragopan | B02X | V01 | Pakistan, India | Phasianidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trematolobelia grandifolia | No common name | No common name | Q2WU | P01 | HI; | Campanulaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Trematolobelia singularis | No common name | No common name | Q3A0 | P01 | HI; U.S.A. (HI) | Campanulaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Triaenodes phalacris | Athens long-horned caddisfly | Caddisfly, Athens long-horned | I03B | I01 | OH; Believed to be extinct | Leptoceridae | NA | Insects | 3 | Not Listed | 3 | US | I | Wherever found |
| Triaenodes tridontus | Three-tooth long-horned caddisfly | Caddisfly, three-tooth long-horned | I04D | I01 | FL, OK; Possibly extinct,not reported since 1965 | Leptoceridae | NA | Insects | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | I | Wherever found |
| Trichechus inunguis | Amazonian manatee | Manatee, Amazonian | A01O | V01 | South America(Amazon River Basin) | Trichechidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trichechus manatus | West Indian Manatee | Manatee, West Indian | A007 | V01 | AL, FL, GA, LA, MS, NC, PR, SC, TX; Mexico,Caribbean; Southeastern North America, Central America, Northeastern South America, Greater and Lesser Antilles (Caribbean); Southeastern US, the Caribbean (Greater Antilles, including Puerto Rico), Mexico, Central and South America, | Trichechidae | Mar 11, 1967 | Mammals | 4 | Threatened | 2, 4 | US/Foreign | V | Wherever found |
| Trichechus senegalensis | West African manatee | Manatee, West African | A07V | V01 | West Coast of Africa from Senegal River to Cuanza River | Trichechidae | Oct 16, 1979 | Mammals | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Trichilia triacantha | Bariaco | Bariaco | Q2KU | P01 | PR; Endemic to Puerto Rico; U.S.A. (PR) | Meliaceae | Feb 05, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Trichocentrum undulatum | Cape Sable orchid | orchid, Cape Sable | Q3PI | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Trichocichla rufa | Long-legged warbler | Warbler, long-legged | B0D9 | V01 | Fijian Islands (Viti Levu and Vanua Levu) | Sylviidae | Jan 16, 2008 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| trichocoronis wrightii | Wright's trichocoronis | trichocoronis, Wright's | Q3JV | P01 | asteraceae | NA | Flowering Plants | 6 | Not Listed | NA | US | P | Wherever found | |
| Trichomanes draytonianum | No common name | No common name | S00X | P01 | HI; | Hymenophyllaceae | NA | Ferns and Allies | 1 | Not Listed | 1 | US | P | Wherever found |
| Trichomanes punctatum ssp. floridanum | Florida bristle fern | fern, Florida bristle | S02G | P01 | FL; | Hymenophyllaceae | Nov 05, 2015 | Ferns and Allies | 4 | Endangered | 4 | US | P | Wherever found |
| trichoniscoides | Trichoniscidae isopod | isopod, Trichoniscidae | K05O | I01 | trichoniscoidae | NA | Crustaceans | 6 | Not Listed | NA | US | I | Wherever found | |
| Trichostema austromontanum ssp. compactum | Hidden Lake bluecurls | Bluecurls, Hidden Lake | Q237 | P01 | CA; U.S.A. (CA) | Lamiaceae | Oct 14, 1998 | Flowering Plants | 8 | Recovery | 8 | US | P | Wherever found |
| Trichostema sp. | Sp. nov. ined. blue curls | Blue curls, sp. nov. ined. | Q3A1 | P01 | NC, SC; | Lamiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Trifolium amoenum | Showy Indian clover | Clover, showy Indian | Q238 | P01 | CA; Known extant only in cultivation; U.S.A. (CA) | Fabaceae | Oct 22, 1997 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Trifolium andersonii beatleyae | Beatley's clover | Clover, Beatley's | Q239 | P01 | CA, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium andinum podocephalum | No common name | No common name | Q3G7 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium barnebyi | [Unnamed] clover | Clover, [unnamed] | Q2WV | P01 | WY; | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Trifolium bolanderi | Parasol clover | Clover, parasol | Q2KW | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium calcaricum | [Unnamed] clover | Clover, [unnamed] | Q3A2 | P01 | VA; | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Trifolium dedeckerae | DeDecker's clover | Clover, DeDecker's | Q2KX | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium friscanum | Frisco clover | clover, Frisco | Q3N5 | P01 | UT; ; Trifolium friscanum is a narrow endemic known from five small populations containing nine sites on private, SITLA, BLM, and USFS lands in Beaver and Millard Counties, Utah (Kass 1992c, pp. 4–5; Evenden 1998, pp. 6–7, Appendix C; Evenden 1999, pp. 2–3; Miller 2010c, pp. 1, 4; Miller 2010e, pers. comm.; Roth 2010a, p. 4). Populations are defined as groups of sites located in the same geographic vicinity. Sites are defined as occurrence records or locations recorded by one or more researcher over time within an individual population. Despite additional searches in the San Francisco Mountains and surrounding areas (including the Wah Wah Mountains, the Confusion Range, the Mountain Home Range, and the Tunnel Springs Mountains), no other populations are known to occur (Kass 1992c, pp. 4–5; Evenden 1998, pp. 6–7, Appendix C; Evenden 1999, pp. 2–3; Miller 2010c, pp. 1, 4; Miller 2010e, pers. comm.; Roth 2010a, p. 4). The five populations occur within three mountain ranges in southwestern Utah. The two largest populations, the Grampian Hill and San Francisco Populations, occur on the southern tip on the San Francisco Mountains in Beaver County. East of the San Francisco Mountains are the Beaver Lake Mountains, where the Lime Mountain Population occurs on Lime Mountain. West and south of the San Francisco Mountains are the Wah Wah Mountains. Along the southeastern edge of the Wah Wah Mountains is the southernmost population, the Blue Mountain population, which occurs along the Beaver–Iron County boundary line on Blue Mountain. The Tunnel Springs Population occurs on Tunnel Springs Mountains in Millard County. The Tunnel Springs Mountains are west and north of the Wah Wah Mountains. | Fabaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Trifolium leibergii | [Unnamed] clover | Clover, [unnamed] | Q2RD | P01 | NV, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Trifolium lemmonii | Lemmon's clover | Clover, Lemmon's | Q23A | P01 | CA, CO, NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Trifolium macilentum rollinsii | [Unnamed] clover | Clover, [unnamed] | Q3G8 | P01 | NV; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium neurophyllum | [Unnamed] clover | Clover, [unnamed] | Q3G9 | P01 | AZ, NM; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Trifolium owyheense | Owyhee clover | Clover, Owyhee | Q2KY | P01 | ID, OR; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Trifolium plumosum amplifolium | [Unnamed] clover | Clover, [unnamed] | Q2KZ | P01 | ID; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Trifolium plumosum plumosum | [Unnamed] clover | Clover, [unnamed] | Q2L0 | P01 | OR, WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Trifolium stoloniferum | Running buffalo clover | Clover, running buffalo | Q2RE | P01 | AR, IN, KY, MO, OH, PA, WV; ; U.S.A. (WV, OH, MO, KY, KS, IN, IL, AR) | Fabaceae | Jun 05, 1987 | Flowering Plants | 3 | Endangered | 3, 4, 5 | US | P | Wherever found |
| Trifolium thompsonii | Thompson's clover | Clover, Thompson's | Q2L1 | P01 | WA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Trifolium trichocalyx | Monterey clover | Clover, Monterey | Q23C | P01 | CA; U.S.A. (CA) | Fabaceae | Aug 12, 1998 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Trifolium variegatum | Pacific Grove clover | Clover, Pacific Grove | Q23B | P01 | CA; | Fabaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trifolium virginicum | Kate's-mountain clover | Clover, Kate's-mountain | Q2L2 | P01 | MD, PA, VA, WV; | Fabaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Triglochin gaspense | Gaspe Peninsula arrow-grass | Arrow-grass, Gaspe Peninsula | Q3A3 | P01 | ME; Canada (N.B,Nfld,P.E.I,Que.) | Juncaginaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US/Foreign | P | Wherever found |
| Trigonopelastes floridana | Scrub palmetto flower scarab | Scarab, scrub palmetto flower | I0DA | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Trigonoscuta blaisdelli | Blaisdell trigonoscuta weevil | Weevil, Blaisdell trigonoscuta | I0MB | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta brunneotesselata | Brown-tassel trigonoscuta weevil | Weevil, brown-tassel trigonoscuta | I0FI | I01 | CA; Possibly extinct,not reported since 1965 | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta catalina | Santa Catalina Island trigonscuta weevil | Weevil, Santa Catalina Island trigonscuta | I0MC | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta dorothea corallana | Coral Beach Sand Dune weevil | Weevil, Coral Beach Sand Dune | I0SA | I01 | Curculionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Trigonoscuta dorothea dorothea | Dorothy's El Segundo Dune weevil | Weevil, Dorothy's El Segundo Dune | I0FJ | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta rossi | Fort Ross trigonoscuta weevil | Weevil, Fort Ross trigonoscuta | I0FL | I01 | CA; Believed to be extinct | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta rothi algodones | Roth's dune weevil | Weevil, Roth's dune | I0TT | I01 | Curculionidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Trigonoscuta rothi imperialis | Roth's dune weevil | Weevil, Roth's dune | I0TU | I01 | Curculionidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Trigonoscuta rothi punctata | Roth's dune weevil | Weevil, Roth's dune | I0TV | I01 | Curculionidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Trigonoscuta rothi rothi | Roth's dune weevil | Weevil, Roth's dune | I0TS | I01 | Curculionidae | NA | Insects | 8 | Not Listed | NA | US | I | Wherever found | |
| Trigonoscuta sp. | Doyen's trigonoscuta dune weevil | Weevil, Doyen's trigonoscuta dune | I0OR | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta stantoni | Santa Cruz Island shore weevil | Weevil, Santa Cruz Island shore | I0MD | I01 | CA; | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trigonoscuta yorbalindae | Yorba Linda trigonoscuta weevil | Weevil, Yorba Linda trigonoscuta | I0GK | I01 | CA; Believed to be extinct | Curculionidae | NA | Insects | 1 | Not Listed | 8 | US | I | Wherever found |
| Trillium ovatum oettingeri | Salmon Mountains wake robin | Wake robin, Salmon Mountains | Q2L3 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Trillium persistens | Persistent trillium | Trillium, persistent | Q23D | P01 | GA, SC; U.S.A. (SC, GA) | Liliaceae | May 27, 1978 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Trillium pusillum monticulum | No common name | No common name | Q2RF | P01 | VA, WV; | Liliaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Trillium pusillum ozarkanum | Least, Ozark trillium | Trillium, least, Ozark | Q2L4 | P01 | AR, KY, MO, OK, TN; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Trillium pusillum texanum | Texas trillium | Trillium, Texas | Q2L6 | P01 | AR, LA, TX; | Liliaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 2, 4 | US | P | Wherever found |
| Trillium pusillum var. pusillum | Carolina Least Trillium | Trillium, Carolina Least | Q2L5 | P01 | AL, KY, MS, NC, SC, TN; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Trillium pusillum virginianum | Least, Virginia trillium | Trillium, least, Virginia | Q23E | P01 | VA; | Liliaceae | NA | Flowering Plants | 5 | Not Listed | 5 | US | P | Wherever found |
| Trillium reliquum | Relict trillium | Trillium, relict | Q2RG | P01 | AL, GA, SC; U.S.A. (SC, GA, AL) | Liliaceae | Apr 04, 1988 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Trilobopsis roperi | Shasta chaparral | chaparral, Shasta | G0ED | I01 | CA; | Polygyridae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Trilobopsis tehamana | Tehama chaparral | chaparral, Tehama | G0EF | I01 | CA; | Polygyridae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Trimerotropis bernardi | San Bernardino Mountains grasshopper | Grasshopper, San Bernardino Mountains | I0T1 | I01 | Acrididae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Trimerotropis huroniana | Lake Huron locust | Locust, Lake Huron | I0LC | I01 | MI, WI; | Acrididae | NA | Insects | 3 | Not Listed | 3 | US/Foreign | I | Wherever found |
| Trimerotropis infantilis | Zayante band-winged grasshopper | Grasshopper, Zayante band-winged | I0OY | I01 | CA; U.S.A. (CA) | Acrididae | Jan 24, 1997 | Insects | 8 | Endangered | 8 | US | I | Wherever found |
| Trimerotropis occidentiloides | Santa Monica Mountains grasshopper | Grasshopper, Santa Monica Mountains | I0T3 | I01 | Acrididae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Trimerotropis occulens | Lompoc grasshopper | Grasshopper, Lompoc | I0T2 | I01 | Acrididae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| trimorphodon biscutatus ssp. lambda | Sonoran lyre snake | snake, Sonoran lyre | C06R | V01 | colubridae | NA | Reptiles | 6 | Not Listed | NA | US | V | Wherever found | |
| Tringa flavipes | Lesser Yellowlegs | Yellowlegs, Lesser | B0MD | V01 | Scolopacidae | NA | Birds | 9 | Not Listed | NA | US | V | Wherever found | |
| Tringa guttifer | Nordmann's greenshank | Greenshank, Nordmann's | B052 | V01 | U.S.S.R,Japan south to Malaya,Borneo | Scolopacidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Triniteurybia aberrans | No common name | No common name | Q0XD | P01 | ID; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Triodopsis occidentalis | Arkansas Wedge | Wedge, Arkansas | G044 | I01 | AR; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Triodopsis platysayoides | Flat-spired three-toothed Snail | Snail, flat-spired three-toothed | G00S | I01 | WV; U.S.A. (WV) | Polygyridae | Aug 02, 1978 | Snails | 5 | Threatened | 5 | US | I | Wherever found |
| Triodopsis soelneri | Cape Fear threetooth | Threetooth, Cape Fear | G093 | I01 | NC; | Polygyridae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Trionyx ater | Cuatro Cienegas softshell turtle | Turtle, Cuatro Cienegas softshell | C01F | V01 | Mexico | Trionychidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trionyx gangeticus | Indian softshell turtle | Turtle, Indian softshell | C01I | V01 | Pakistan, India | Trionychidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trionyx hurum | Peacock softshell turtle | Turtle, peacock softshell | C01J | V01 | India, Bangladesh | Trionychidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trionyx nigricans | Black softshell turtle | Turtle, black softshell | C01D | V01 | Bangladesh | Trionychidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Triphora craigheadii | Craighead's nodding-caps | Nodding-caps, Craighead's | Q23F | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Triphora latifolia | [Unnamed] nodding-caps | Nodding-caps, [unnamed] | Q23G | P01 | FL; Possibly extinct | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Triphora yucatanensis | [Unnamed] nodding-caps | Nodding-caps, [unnamed] | Q3A4 | P01 | FL; | Orchidaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Triphysaria floribunda | San Francisco owl's-clover | Owl's-clover, San Francisco | Q1SI | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tripsacum floridanum | [Unnamed] gama grass | Gama grass, [unnamed] | Q23H | P01 | FL; | Poaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Trisetum orthochaetum | No common name | No common name | Q23I | P01 | MT; | Poaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Triteleia clementina | San Clemente Island brodiaea | Brodiaea, San Clemente Island | Q2L7 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Triteleia dudleyi | Dudley's brodiaea | Brodiaea, Dudley's | Q2L8 | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Triteleia lemmonae | No common name | No common name | Q2L9 | P01 | AZ; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Triteleiopsis palmeri | No common name | No common name | Q2LA | P01 | AZ; | Liliaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Tritocleis microphylla | `Ola`a pepppered looper | Looper, `Ola`a pepppered | I09L | I01 | HI; Believed to be extinct | Geometridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Trochomorpha apia | [Unnamed] snail | Snail, [unnamed] | G0BS | I01 | AS; | Trochomorphidae | NA | Snails | 1 | Not Listed | 1 | US | I | Wherever found |
| Troglocambarus maclanei | Spider Cave crayfish | crayfish, Spider Cave | K07M | I01 | FL; | Cambaridae | NA | Crustaceans | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Troglodytes aedon guadeloupensis | Guadeloupe house wren | Wren, Guadeloupe house | B03S | V01 | West Indies-Guadeloupe | Troglodytidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Troglodytes aedon mesoleucus | St. Lucia house wren | Wren, St. Lucia house | B03T | V01 | West Indies-Saint Lucia | Troglodytidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Trogloglanis pattersoni | Toothless blindcat | Blindcat, toothless | E02E | V01 | TX; | Ictaluridae | NA | Fishes | 2 | Under Review in the Candidate or Petition Process | 2 | US | V | Wherever found |
| Troides alexandrae | Queen Alexandra's birdwing butterfly | Butterfly, Queen Alexandra's birdwing | I0ME | I01 | Papua New Guinea | Papilionidae | Sep 21, 1989 | Insects | Foreign | Endangered | NA | Foreign | I | Wherever found |
| Troides croesus | Swallowtail butterfly | Butterfly, swallowtail | I0SL | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Troides dohertyi | Swallowtail butterfly | Butterfly, swallowtail | I0SK | I01 | Papilionidae | NA | Insects | NA | Not Listed | NA | I | Wherever found | ||
| Trollius laxus laxus | No common name | No common name | Q23J | P01 | CT, DE, NJ, NY, OH, PA; | Ranunculaceae | NA | Flowering Plants | 5 | Not Listed | 3, 5 | US | P | Wherever found |
| Tropidocarpum capparideum | Caper-fruited tropidocarpum | Tropidocarpum, caper-fruited | Q2LB | P01 | CA; Possibly extinct | Brassicaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Tropidophis melanurus bucculentus | Navassa dusky dwarf boa | Boa, Navassa dusky dwarf | C03A | V01 | Colubridae | NA | Reptiles | 4 | Not Listed | NA | US | V | Wherever found | |
| Trox howelli | Caracara commensal scarab | Scarab, caracara commensal | I0DB | I01 | FL; | Scarabaeidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Truncilla cognata | Mexican fawnsfoot | Fawnsfoot, Mexican | F02J | I01 | TX; | Unionidae | NA | Clams | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | I | Wherever found |
| Truncilla macrodon | Texas fawnsfoot | Fawnsfoot, Texas | F04E | I01 | TX; | Unionidae | NA | Clams | 2 | Candidate | 2 | US | I | Wherever found |
| Tryonia alamosae | Alamosa springsnail | Springsnail, Alamosa | G03Q | I01 | NM; U.S.A. (NM) | Hydrobiidae | Sep 30, 1991 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Tryonia angulata | Sportinggoods tryonia | Tryonia, sportinggoods | G03Z | I01 | NV; | Hydrobiidae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Tryonia brunei | Brune's tryonia | Tryonia, Brune's | G05I | I01 | TX; | Hydrobiidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Tryonia cheatumi | Phantom Tryonia | Tryonia, Phantom | G013 | I01 | TX; | Hydrobiidae | Jul 09, 2013 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Tryonia circumstriata (=stocktonensis) | Gonzales tryonia | Tryonia, Gonzales | G05D | I01 | TX; | Hydrobiidae | Jul 09, 2013 | Snails | 2 | Endangered | 2 | US | I | Wherever found |
| Tryonia clathrata | Grated tryonia | Tryonia, grated | G012 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Tryonia elata | Point of Rocks tryonia | Tryonia, Point of Rocks | G040 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Tryonia ericae | Minute tryonia | Tryonia, minute | G041 | I01 | NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Tryonia gilae | Gila Tryonia snail | Snail, Gila Tryonia | G05J | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Tryonia imitator | Mimic tryonia | Tryonia, mimic | G00F | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Tryonia margae | Grapevine Springs elongate tryonia | Tryonia, Grapevine Springs elongate | G0BT | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Tryonia quitobaquitae | Quitobaquito tryonia | Tryonia, Quitobaquito | G05K | I01 | AZ; | Hydrobiidae | NA | Snails | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| Tryonia robusta | Robust tryonia | Tryonia, robust | G0BV | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Tryonia rowlandsi | Grapevine Springs squat tryonia | Tryonia, Grapevine Springs squat | G0BU | I01 | CA; | Hydrobiidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Tryonia variegata | Amargosa tryonia | Tryonia, Amargosa | G011 | I01 | CA, NV; | Hydrobiidae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Tsuga caroliniana | Carolina hemlock | Hemlock, Carolina | R00M | P01 | GA, NC, SC, TN, VA; | Pinaceae | NA | Conifers and Cycads | 4 | Under Review in the Candidate or Petition Process | 4, 5 | US | P | Wherever found |
| Tubastraea floreana | No common name | No common name | P022 | I01 | Dendrophylliidae | Nov 06, 2015 | Corals | NMFS | Endangered | NA | Foreign | I | Entire | |
| tuberochernes ubicki | No common name | No common name | J03A | I01 | chernetidae | NA | Arachnids | 2 | Not Listed | NA | US | I | Wherever found | |
| Tuberolabium guamense | No common name | No common name | Q3P3 | P01 | GU, MP; | Orchidaceae | Nov 02, 2015 | Flowering Plants | 1 | Threatened | 1 | US | P | Wherever found |
| Tuctoria greenei | Greene's tuctoria | Tuctoria, Greene's | Q23K | P01 | CA, OR; U.S.A. (CA) | Poaceae | Mar 26, 1997 | Flowering Plants | 8 | Endangered | 1, 8 | US | P | Wherever found |
| Tuctoria mucronata | Solano grass | Grass, Solano | Q23L | P01 | CA; U.S.A. (CA) | Poaceae | Sep 29, 1978 | Flowering Plants | 8 | Endangered | 8 | US | P | Wherever found |
| Tulotoma magnifica | Tulotoma snail | Snail, tulotoma | G04X | I01 | AL; U.S.A. (AL) | Viviparidae | Jan 09, 1991 | Snails | 4 | Threatened | 4 | US | I | Wherever found |
| Tumamoca macdougalii | Tumamoc globeberry | Globeberry, Tumamoc | Q2LC | P01 | AZ; | Cucurbitaceae | Apr 29, 1986 | Flowering Plants | 2 | Original Data in Error - New Information Discovered | 2 | US/Foreign | P | Wherever found |
| Turbinicarpus gautii | Butterfly, Gaut's cactus | Cactus, butterfly, Gaut's | Q19G | P01 | TX; | Cactaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Turdus olivaceus helleri | Taita thrush | Thrush, Taita | B0A5 | V01 | Turdidae | Jan 12, 1995 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Turdus poliocephalus poliocephalus | Grey-headed blackbird | Blackbird, grey-headed | B0D6 | V01 | Norfolk Island, Extinct | Turdidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found |
| Turnagra capensis | New Zealand thrush (wattlebird) | Thrush, New Zealand (wattlebird) | B03E | V01 | Callaeidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found | |
| Tympanuchus cupido attwateri | Attwater's greater prairie-chicken | Prairie-chicken, Attwater's greater | B00O | V01 | TX; U.S.A. (TX) | Phasianidae | Mar 11, 1967 | Birds | 2 | Endangered | 2 | US | V | Wherever found |
| Tympanuchus pallidicinctus | Lesser prairie-chicken | Prairie-chicken, lesser | B0AZ | V01 | CO, KS, NM, OK, TX; Southern high plains of the United States | Phasianidae | May 12, 2014 | Birds | 2 | Under Review in the Candidate or Petition Process | 2, 6 | US | V | Wherever found |
| Tympanuchus phasianellus columbianus | Columbian sharp-tailed grouse | Grouse, Columbian sharp-tailed | B08G | V01 | CA, CO, ID, MT, NV, OR, UT, WA, WY; | Phasianidae | NA | Birds | 1 | Not Listed | 1, 6, 8 | US/Foreign | V | Wherever found |
| Typhlatya monae | Troglobitic groundwater shrimp | Shrimp, troglobitic groundwater | K02G | I01 | PR, VI; | Atyidae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| typhlichthys subterraneus | Southern cavefish | cavefish, Southern | E0AU | V01 | amblyopsidae | NA | Fishes | 2 | Not Listed | NA | US | V | Wherever found | |
| Typhlogastrura helleri | Heller Cave springtail | springtail, Heller Cave | I0WC | I01 | PA; | Hypogastruridae | NA | Insects | 5 | Under Review in the Candidate or Petition Process | 5 | US | I | Wherever found |
| Typhlomolge rathbuni | Texas blind salamander | Salamander, Texas blind | D001 | V01 | TX; U.S.A. (TX) | Plethodontidae | Mar 11, 1967 | Amphibians | 2 | Endangered | 2 | US | V | Wherever found |
| Tyto longimembris | Grass owl | Owl, grass | B0B2 | V01 | Tytonidae | NA | Birds | Foreign | Not Listed | NA | Foreign | V | Wherever found | |
| Tyto soumagnei | Madagascar red owl | Owl, Madagascar red | B06D | V01 | Madagascar | Tytonidae | Sep 28, 1990 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Uma inornata | Coachella Valley fringe-toed lizard | Lizard, Coachella Valley fringe-toed | C02I | V01 | CA; U.S.A. (CA) | Phrynosomatidae | Sep 25, 1980 | Reptiles | 8 | Threatened | 8 | US | V | Wherever found |
| Uma notata | Colorado Desert fringed-toed lizard | Lizard, Colorado Desert fringed-toed | C04M | V01 | CA; | Iguanidae | NA | Reptiles | 8 | Not Listed | 8 | US/Foreign | V | Wherever found |
| Uma rufopunctata | Yuman desert fringe-toed lizard | Lizard, Yuman desert fringe-toed | C03I | V01 | AZ; | Iguanidae | NA | Reptiles | 2 | Under Review in the Candidate or Petition Process | 2 | US/Foreign | V | Wherever found |
| Uma scoparia | Mojave fringe-toed Lizard | Lizard, Mojave fringe-toed | C06G | V04 | CA; | Phrynosomatidae | NA | Reptiles | 8 | Not Listed | 8 | US | V | Amargosa River population |
| Uncia (=Panthera) uncia | Snow leopard | Leopard, snow | A041 | V01 | Wherever found | Felidae | Mar 28, 1972 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Undescribed sp. | Virile Amargosa snail | Snail, Virile Amargosa | G08Q | I01 | Hydrobiidae | NA | Snails | 1 | Not Listed | NA | US | I | Wherever found | |
| Uratelornis chimaera | Long-tailed ground roller | Roller, long-tailed ground | B037 | V01 | Malagasy Republic (Madagascar) | Brachypteraciidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Urera glabra | No common name | No common name | Q2LD | P01 | HI; | Urticaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Urera kaalae | Opuhe | Opuhe | Q23M | P01 | HI; U.S.A. (HI) | Urticaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Urocitellus brunneus | Northern Idaho Ground Squirrel | Squirrel, Northern Idaho Ground | A0EK | V01 | ID; U.S.A. (ID) | Sciuridae | Apr 05, 2000 | Mammals | 1 | Threatened | 1 | US | V | Wherever found |
| Urocitellus endemicus | Southern Idaho ground Squirrel | Squirrel, Southern Idaho ground | A0EO | V01 | ID; | Sciuridae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Urocitellus washingtoni | Washington ground squirrel | Squirrel, Washington ground | A0HE | V01 | OR, WA; | Sciuridae | NA | Mammals | 1 | Not Listed | 1 | US | V | Wherever found |
| Urocyon cinereoargenteus ssp. ocythous | Prairie gray fox | fox, prairie gray | A0K8 | V01 | Canidae | NA | Mammals | 3 | Under Review in the Candidate or Petition Process | NA | US | V | Wherever found | |
| Urocyon littoralis | Island fox | Fox, island | A0HP | V01 | CA; | Canidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Urocyon littoralis catalinae | Santa Catalina Island Fox | Fox, Santa Catalina Island | A08K | V01 | CA; Entire | Canidae | Mar 05, 2004 | Mammals | 8 | Threatened | 8 | US | V | Wherever found |
| Urocyon littoralis clementae | San Clemente Island fox | Fox, San Clemente Island | A08H | V01 | CA; | Canidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Urocyon littoralis dickeyi | San Nicolas Island fox | Fox, San Nicolas Island | A08J | V01 | CA; | Canidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Urocyon littoralis littoralis | San Miguel Island Fox | Fox, San Miguel Island | A08I | V01 | CA; U.S.A(CA) | Canidae | Mar 05, 2004 | Mammals | 8 | Recovery | 8 | US | V | wherever found |
| Urocyon littoralis santacruzae | Santa Cruz Island Fox | Fox, Santa Cruz Island | A08L | V01 | CA; Entire | Canidae | Mar 05, 2004 | Mammals | 8 | Recovery | 8 | US | V | wherever found |
| Urocyon littoralis santarosae | Santa Rosa Island Fox | Fox, Santa Rosa Island | A08M | V01 | CA; Entire | Canidae | Mar 05, 2004 | Mammals | 8 | Recovery | 8 | US | V | wherever found |
| ursia furtiva | No common name | No common name | I0UV | I01 | TX; | notodontidae | NA | Insects | 2 | Under Review in the Candidate or Petition Process | 2 | US | I | Wherever found |
| ursia species | A Notodontid moth | moth, A Notodontid | I0UW | I01 | notodontidae | NA | Insects | 2 | Not Listed | NA | US | I | Wherever found | |
| Urspelerpes brucei | Patch-nosed salamander | salamander, Patch-nosed | D04Q | V01 | GA, SC; | Plethodontidae | NA | Amphibians | 4 | Not Listed | 4 | US | V | Wherever found |
| Ursus americanus | American black bear | Bear, American black | A0G1 | V01 | MS; U.S.A. (LA, all counties; MS, TX, only within the historic county range of the Louisiana black bear) | Ursidae | Jan 07, 1992 | Mammals | 4 | Not Listed | 4 | US | V | U.S.A. (LA, all counties; MS, TX, only within the historic county range of the Louisiana black bear) |
| Ursus americanus emmonsii | Glacier bear | Bear, Glacier | A0AJ | V01 | AK; | Ursidae | NA | Mammals | 7 | Not Listed | 7 | US | V | Wherever found |
| Ursus americanus floridanus | Florida black bear | Bear, Florida black | A08E | V01 | FL, GA; | Ursidae | NA | Mammals | 4 | Not Listed | 4 | US | V | Wherever found |
| Ursus americanus luteolus | Louisiana black bear | Bear, Louisiana black | A08F | V01 | LA, MS, TX; ; Entire | Ursidae | Jan 07, 1992 | Mammals | 4 | Recovery | 2, 4 | US | V | Wherever found |
| Ursus arctos | Mexican grizzly bear | Bear, Mexican grizzly | A02V | V01 | Mexico | Ursidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Mexico |
| Ursus arctos arctos | Brown bear | Bear, brown | A04P | V01 | Italy | Ursidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Italy |
| Ursus arctos horribilis | Grizzly bear | Bear, grizzly | A001 | V01 | ID, MT, WA, WY; Extirpated from Regions 2 and 3; U.S.A., conterminous (lower 48) States, except where listed as an experimental population | Ursidae | Jul 28, 1975 | Mammals | 6 | Threatened | 1, 6 | US | V | U.S.A., conterminous (lower 48) States, except where listed as an experimental population |
| Ursus arctos horribilis | Grizzly bear | Bear, grizzly | A001 | V02 | ID; U.S.A. (portions of ID and MT, see 17.84(l)) | Ursidae | Nov 17, 2000 | Mammals | 6 | Experimental Population, Non-Essential | 1 | US | V | Bitterroot Grizzly Bear Nonessential Experimental Population Area |
| Ursus arctos horribilis | Grizzly bear | Bear, grizzly | A001 | V03 | ID, MT; | Ursidae | Jul 28, 1975 | Mammals | 6 | Under Review in the Candidate or Petition Process | 1, 6 | US | V | Cabinet-Yaak Recovery Zone Population |
| Ursus arctos horribilis | Grizzly bear | Bear, grizzly | A001 | V04 | WA; | Ursidae | NA | Mammals | 6 | Under Review in the Candidate or Petition Process | 1 | US | V | North Cascades Ecosystem Recovery Zone |
| Ursus arctos horribilis | Grizzly bear | Bear, grizzly | A001 | V06 | ID, MT, WY; Extirpated from Regions 2 and 3 | Ursidae | Jul 28, 1975 | Mammals | 6 | Under Review in the Candidate or Petition Process | 1, 6 | US | V | Greater Yellowstone Ecosystem Distinct Population Segment |
| Ursus arctos pruinosus | Brown bear | Bear, brown | A04Q | V01 | China (Tibet); Entire | Ursidae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Ursus maritimus | Polar bear | Bear, polar | A0IJ | V01 | AK; ; Entire | Ursidae | May 15, 2008 | Mammals | 7 | Threatened | 7 | US/Foreign | V | Wherever found |
| Ursus thibetanus gedrosianus | Baluchistan bear | Bear, Baluchistan | A0FG | V01 | Iran, Pakistan | Ursidae | May 16, 1986 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Urtica chamaedryoides | No common name | No common name | Q23N | P01 | AL, AR, FL, GA, KS, KY, LA, MA, MO, MS, OH, OK, SC, TN, TX, WV; | Urticaceae | NA | Flowering Plants | 2 | Not Listed | 2, 3, 4, 5, 6 | US | P | Wherever found |
| Usnea longissima | No common name | No common name | U006 | P01 | Parmeliaceae | NA | Lichens | 8 | Not Listed | NA | US/Foreign | P | Wherever found | |
| Utabaenetes tanneri | Tanner's black camel cricket | Camel cricket, Tanner's black | I04J | I01 | UT; | Rhaphidophoridae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Vaccinium crassifolium | Raynor's huckleberry | Huckleberry, Raynor's | Q2LF | P01 | SC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Vaccinium hirsutum | Wooly berry | Berry, wooly | Q3GA | P01 | NC; | Ericaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Vaccinium membranaceum | Siskiyou Mountains bilberry | Bilberry, Siskiyou Mountains | Q2LE | P01 | CA, OR; | Ericaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Vaccinium vacillans missouriense | No common name | No common name | Q2LG | P01 | MO; | Ericaceae | NA | Flowering Plants | 3 | Not Listed | 3 | US | P | Wherever found |
| Vaga blackburni | Hawaiian hairstreak butterfly | Butterfly, Hawaiian hairstreak | I00D | I01 | HI; | Lycaenidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Vagrans egistina | Mariana wandering butterfly | Butterfly, Mariana wandering | I0R8 | I01 | GU, MP; | Nymphalidae | Nov 02, 2015 | Insects | 1 | Endangered | 1 | US | I | Wherever found |
| Valeriana columbiana | No common name | No common name | Q2LH | P01 | WA; Canada (B.C.) | Valerianaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Valeriana texana | Guadalupe valerian | Valerian, Guadalupe | Q23O | P01 | NM, TX; | Valerianaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Valeriana uliginosa | Marsh valerian | Valerian, marsh | Q2LI | P01 | IL, IN, ME, MI, NH, NY, OH, VT, WI; Canada (N.B,Ont,Que.) | Valerianaceae | NA | Flowering Plants | 4 | Not Listed | 3, 5 | US | P | Wherever found |
| Valerianella texana | Edwards' Plateau cornsalad | Cornsalad, Edwards' Plateau | Q2LJ | P01 | TX; | Valerianaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| valvata mergella | Aquatic snail | snail, Aquatic | G0CB | I01 | valvatidae | NA | Snails | 8 | Not Listed | NA | US | I | Wherever found | |
| Valvata utahensis | Utah valvata snail | Snail, Utah valvata | G05R | I01 | ID, UT; | Valvatidae | Dec 14, 1992 | Snails | 1 | Original Data in Error - New Information Discovered | 1, 6 | US | I | Wherever found |
| Valvata virens | [Unnamed] snail | Snail, [unnamed] | G0BW | I01 | CA; | Valvatudae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Vancouveria chrysantha | Siskiyou inside-out flower | Inside-out flower, Siskiyou | Q2LK | P01 | CA, OR; | Berberidaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Varanus bengalensis | Indian (=Bengal) monitor | Monitor, Indian (=Bengal) | C017 | V01 | Vietnam, Thailand, Sri Lanka, Myanmar (Burma), Malaysia, Iraq, Iran, India, Afghanistan | Varanidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Varanus flavescens | Yellow monitor | Monitor, yellow | C019 | V01 | West Pakistan through India to Bangladesh | Varanidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Varanus griseus | Desert monitor | Monitor, desert | C016 | V01 | North Africa to Aral Sea,through Central Asia to Pakistan,Northwest India | Varanidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Varanus komodoensis | Komodo Island monitor | Monitor, Komodo Island | C018 | V01 | Indonesia (Komodo,Rintja,Padar,and western Flores Island) | Varanidae | Jun 14, 1976 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Varronia rupicola | No common name | No common name | Q0GP | P01 | PR; British Virgin Islands (Anegada Island) | Boraginaceae | Oct 09, 2014 | Flowering Plants | 4 | Threatened | 4 | US/Foreign | P | Wherever found |
| Vauquelinia californica pauciflora | Limestone rosewood | Rosewood, limestone | Q2LL | P01 | AZ, NM; | Rosaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US/Foreign | P | Wherever found |
| Veratrum fimbriatum | Fringed false-hellebore | False-hellebore, fringed | Q2LM | P01 | CA; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Veratrum woodii | False hellebore | Hellebore, false | Q2LN | P01 | AR, FL, GA, IA, IL, IN, KY, MO, NC, OH, OK, TN; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 2, 3, 4 | US | P | Wherever found |
| Verbena californica | Red Hills vervain | Vervain, Red Hills | Q2LO | P01 | CA; U.S.A. (CA) | Verbenaceae | Oct 14, 1998 | Flowering Plants | 8 | Threatened | 8 | US | P | Wherever found |
| Verbena riparia | Riverbank vervain | vervain, Riverbank | Q3A5 | P01 | NC, VA; Possibly extinct | Verbenaceae | NA | Flowering Plants | 5 | Not Listed | 4, 5 | US | P | Wherever found |
| Verbesina chapmanii | Chapman's crownbeard | Crownbeard, Chapman's | Q2LQ | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Verbesina dissita | Big-leaved crownbeard | Crownbeard, big-leaved | Q3GB | P01 | CA; U.S.A. (CA), Mexico | Asteraceae | Oct 07, 1996 | Flowering Plants | 8 | Threatened | 8 | US/Foreign | P | Wherever found |
| Verbesina heterophylla | No common name | No common name | Q2LR | P01 | FL; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Vermivora bachmanii | Bachman's warbler (=wood) | Warbler (=wood), Bachman's | B03G | V01 | FL, SC; Presumed near extinction--no known localities of regular occurence in since early 1970's (Cuba); U.S.A. (Southeastern), Cuba | Emberizidae | Mar 11, 1967 | Birds | 4 | Endangered | 4 | US/Foreign | V | Wherever found |
| Vermivora chrysoptera | Golden-winged warbler | Warbler, Golden-winged | B0G4 | V01 | AL, AR, CT, DC, DE, FL, GA, IA, IL, IN, KY, MA, MD, MI, MN, MO, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, TX, VA, VT, WI, WV; | Parulidae | NA | Birds | 3 | Under Review in the Candidate or Petition Process | 2, 3, 4, 5 | US | V | Wherever found |
| Vermivora crissalis | Colima warbler | Warbler, Colima | B07U | V01 | TX; | Emberizidae | NA | Birds | 2 | Not Listed | 2 | US/Foreign | V | Wherever found |
| Vermivora luciae | Lucy's warbler | Warbler, Lucy's | B0DL | V01 | Parulidae | NA | Birds | 1 | Not Listed | NA | US | V | Wherever found | |
| vermivora ruficapilla | Nashville warbler | warbler, Nashville | B0F2 | V01 | fringillidae | NA | Birds | 4 | Not Listed | NA | US | V | Wherever found | |
| Vermivora virginiae | Virginia's Warbler | Warbler, Virginia's | B0IL | V01 | Parulidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Vernonia borinquensis | No common name | No common name | Q2LS | P01 | PR, VI; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Vernonia proctorii | No common name | No common name | Q3A6 | P01 | PR; Endemic to Sierra Bermeja, Puerto Rico; U.S.A. (Endemic to PR) | Asteraceae | Apr 27, 1993 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Vernonia pulchella | No common name | No common name | Q2LT | P01 | GA; | Asteraceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Veronica copelandii | Copeland's speedwell | Speedwell, Copeland's | Q2LU | P01 | CA; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Veronica peregrina | No common name | No common name | Q2LV | P01 | OR; | Scrophulariaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Vertigo alabamensis | Alabama vertigo | Vertigo, Alabama | G042 | I01 | AL; | Pupillidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Vertigo arthuri | Callused vertigo | Vertigo, callused | G0BX | I01 | MN, ND, SD, WY; | Pupillidae | NA | Snails | 6 | Not Listed | 3, 6 | US | I | Wherever found |
| Vertigo briarensis | Briarton Pleistocene snail | Snail, Briarton Pleistocene | G04V | I01 | IA, MN, WI; | Pupillidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Vertigo hebardi | Keys vertigo | Vertigo, Keys | G043 | I01 | FL; | Pupillidae | NA | Snails | 4 | Not Listed | 4 | US | I | Wherever found |
| Vertigo hubrichti | Hubricht's vertigo | Vertigo, Hubricht's | G05L | I01 | IA, MN, WI; | Pupillidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Vertigo meramecensis | Meramac River vertigo | Vertigo, Meramac River | G05M | I01 | IA, MO; | Pupillidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Vertigo occulta | Occult vertigo | Vertigo, occult | G05N | I01 | IA, MN; | Pupillidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Vertigo ovata | Ovate vertigo | Vertigo, ovate | G094 | I01 | NM; | Pupillidae | NA | Snails | 2 | Not Listed | 2 | US | I | Wherever found |
| Vertigo sp | Hoko vertigo | vertigo, Hoko | G0EJ | I01 | WA; | Pupillidae | NA | Snails | 1 | Under Review in the Candidate or Petition Process | 1 | US | I | Wherever found |
| Vertigo sp. | Iowa Pleistocene Vertigo | Vertigo, Iowa Pleistocene | G05O | I01 | IA; | Pupillidae | NA | Snails | 3 | Not Listed | 3 | US | I | Wherever found |
| Vespericola karokorum | Karok hesperian | Hesperian, Karok | G003 | I01 | CA; | Polygyridae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Vespericola pressleyi | Big Bar hesperian | hesperian, Big Bar | G0EH | I01 | CA; | Polygyridae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Vespericola shasta | Shasta hesperian | hesperian, Shasta | G0EG | I01 | CA; | Polygyridae | NA | Snails | 8 | Under Review in the Candidate or Petition Process | 8 | US | I | Wherever found |
| Vetericaris chaceorum | Anchialine pool shrimp | Shrimp, anchialine pool | K03C | I01 | HI; | Procaridae | Nov 29, 2013 | Crustaceans | 1 | Endangered | 1 | US | I | Wherever found |
| Viburnum bracteatum | [Unnamed] arrowwood | Arrowwood, [unnamed] | Q2LW | P01 | AL, GA, TN; | Caprifoliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Vicia menziesii | Hawaiian vetch | Vetch, Hawaiian | Q23Q | P01 | HI; U.S.A. (HI) | Fabaceae | May 27, 1978 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Vicia minutiflora | Hairy pod vetch | Vetch, hairy pod | Q2LY | P01 | OK, TX; | Fabaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Vicia ocalensis | Ocala vetch | Vetch, Ocala | Q2LX | P01 | FL; | Fabaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Vicugna vicugna | Vicuna | Vicuna | A02L | V01 | Ecuador | Camelidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Ecuador (DPS) |
| Vicugna vicugna | Vicuna | Vicuna | A02L | V02 | Entire, except for Ecuador | Camelidae | Jul 01, 2002 | Mammals | Foreign | Threatened | NA | Foreign | V | Entire, except Ecuador |
| Vigna o-wahuensis | No common name | No common name | Q23R | P01 | HI; U.S.A. (HI) | Fabaceae | Nov 10, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| viguiera laciniata | San Diego County viguiera | viguiera, San Diego County | Q3JT | P01 | asteraceae | NA | Flowering Plants | 1 | Not Listed | NA | US | P | Wherever found | |
| Viguiera phenax | Field goldeneye | Goldeneye, field | Q0YG | P01 | TX; | Asteraceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Villosa arkansasensis | Ouachita creekshell | Creekshell, Ouachita | F04L | I01 | AR, OK; | Unionidae | NA | Clams | 4 | Not Listed | 2, 4 | US | I | Wherever found |
| Villosa choctawensis | Choctaw bean | Bean, Choctaw | F01B | I01 | AL, FL; U.S.A. (FL, AL) | Unionidae | Oct 10, 2012 | Clams | 4 | Endangered | 4 | US | I | Wherever found |
| Villosa fabalis | Rayed Bean | Bean, rayed | F01A | I01 | IN, KY, MI, NY, OH, PA, TN, VA, WV; U.S.A. (WV, VA, TN, PA, OH, NY, MI, KY, IN, IL); Canada (ON) | Unionidae | Mar 15, 2012 | Clams | 3 | Endangered | 3, 4, 5 | US/Foreign | I | Wherever found |
| Villosa nebulosa | Alabama rainbow | rainbow, Alabama | F051 | I01 | AL, GA, NC, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Villosa ortmanni | Kentucky creekshell | Creekshell, Kentucky | F008 | I01 | KY; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Villosa perpurpurea | Purple bean | Bean, purple | F001 | I01 | TN, VA; U.S.A. (VA, TN) | Unionidae | Jan 10, 1997 | Clams | 5 | Endangered | 4, 5 | US | I | Wherever found |
| Villosa trabalis | Cumberland bean (pearlymussel) | Bean, Cumberland (pearlymussel) | F000 | I01 | AL, KY, NC, TN, VA; U.S.A. (VA, TN, KY, AL) | Unionidae | Jun 14, 1976 | Clams | 4 | Endangered | 4, 5 | US | I | Wherever found; Except where listed as Experimental Populations |
| Villosa trabalis | Cumberland bean (pearlymussel) | Bean, Cumberland (pearlymussel) | F000 | I02 | AL; U.S.A. (VA, TN, KY, AL) | Unionidae | Jun 14, 2001 | Clams | 4 | Experimental Population, Non-Essential | 4 | US | I | U.S.A. (AL;The free-flowing reach of the Tennessee R. from the base of Wilson Dam downstream to the backwaters of Pickwick Reservoir [about 12 RM (19 km)] and the lower 5 RM [8 km] of all tributaries to this reach in Colbert and Lauderdale Cos., see 17.85(a)) |
| Villosa trabalis | Cumberland bean (pearlymussel) | Bean, Cumberland (pearlymussel) | F000 | I03 | U.S.A. (VA, TN, KY, AL) | Unionidae | Oct 15, 2007 | Clams | 4 | Experimental Population, Non-Essential | NA | US | I | U.S.A. (TN - specified portions of the French Broad and Holston Rivers; see 17.85(b)(1)) |
| Villosa umbrans | Coosa creekshell | creekshell, Coosa | F052 | I01 | AL, GA, TN; | Unionidae | NA | Clams | 4 | Under Review in the Candidate or Petition Process | 4 | US | I | Wherever found |
| Villosa vaughaniana | Carolina creekshell | Creekshell, Carolina | F049 | I01 | Unionidae | NA | Clams | 4 | Not Listed | NA | US | I | Wherever found | |
| Viola adunca cascadensis | No common name | No common name | Q2M1 | P01 | OR, WA; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Viola chamissoniana ssp. chamissoniana | Pamakani | Pamakani | Q23S | P01 | HI; U.S.A. (HI) | Violaceae | Oct 29, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Viola egglestonii | No common name | No common name | Q2M2 | P01 | AL, GA, IN, KY, TN; | Violaceae | NA | Flowering Plants | 4 | Not Listed | 3, 4 | US | P | Wherever found |
| Viola flettii | Flett's violet | Violet, Flett's | Q2M3 | P01 | WA; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Viola franksmithii | Frank Smith's violet | Violet, Frank Smith's | Q3GC | P01 | UT; | Violaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Viola guadalupensis | Guadalupe Mountain violet | Violet, Guadalupe Mountain | Q3GD | P01 | TX; | Violaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Viola helenae | No common name | No common name | Q23T | P01 | HI; U.S.A. (HI) | Violaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Viola kauaiensis var. wahiawaensis | Nani wai`ale`ale | Nani wai`ale`ale | Q23U | P01 | HI; U.S.A. (HI) | Violaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Viola lanaiensis | No common name | No common name | Q23V | P01 | HI; U.S.A. (HI) | Violaceae | Sep 20, 1991 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Viola lithion | No common name | No common name | Q3GE | P01 | NV, UT; | Violaceae | NA | Flowering Plants | 6 | Not Listed | 6, 8 | US | P | Wherever found |
| Viola novae-angliae | New England violet | Violet, New England | Q2M4 | P01 | ME, MI, MN, NY, WI; Canada (Man,N.B,Ont.) | Violaceae | NA | Flowering Plants | 3 | Not Listed | 3, 5 | US | P | Wherever found |
| Viola oahuensis | No common name | No common name | Q23W | P01 | HI; U.S.A. (HI) | Violaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Viola primulifolia occidentalis | Western bog violet | Violet, western bog | Q3GF | P01 | CA, OR; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 1, 8 | US | P | Wherever found |
| Viola purpurea charlestonensis | Limestone violet | Violet, limestone | Q2M5 | P01 | NV, UT; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Viola robusta | No common name | No common name | Q23X | P01 | HI; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Viola tomentosa | Felt-leaf violet | Violet, felt-leaf | Q2M6 | P01 | CA; | Violaceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Vipera latifii | Lar Valley viper | Viper, Lar Valley | C037 | V01 | Iran | Viperidae | Jun 22, 1983 | Reptiles | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Vireo atricapilla | Black-capped Vireo | Vireo, Black-capped | B07T | V01 | OK, TX; U.S.A. (TX, OK, NE, LA, KS), Mexico | Vireonidae | Oct 06, 1987 | Birds | 2 | Recovery | 2 | US/Foreign | V | Wherever found |
| Vireo bellii | Bell's Vireo | Vireo, Bell's | B0JX | V01 | Vireonidae | NA | Birds | 6 | Not Listed | NA | US | V | Wherever found | |
| Vireo bellii arizonae | Arizona Bell's vireo | Vireo, Arizona Bell's | B066 | V01 | AZ, CA, NV, UT; | Vireonidae | NA | Birds | 2 | Not Listed | 2, 6, 8 | US/Foreign | V | Wherever found |
| Vireo bellii pusillus | Least Bell's vireo | Vireo, least Bell's | B067 | V01 | CA; U.S.A. (CA), Mexico | Vireonidae | May 02, 1986 | Birds | 8 | Endangered | 8 | US/Foreign | V | Wherever found |
| Vireo vicinior | Gray vireo | vireo, Gray | B0G5 | V01 | Vireonidae | NA | Birds | 8 | Not Listed | NA | US | V | Wherever found | |
| Viverra civettina (=megaspila c.) | Malabar large-spotted civet | Civet, Malabar large-spotted | A07A | V01 | Entire | Viverridae | Jul 27, 1979 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Vorticifex sp | Knobby Rams-horn | Rams-horn, Knobby | G0EO | I01 | CA; | Planorbidae | NA | Snails | 8 | Not Listed | 8 | US | I | Wherever found |
| Vulpes macrotis mutica | San Joaquin kit fox | Fox, San Joaquin kit | A006 | V01 | CA; U.S.A.(CA) | Canidae | Mar 11, 1967 | Mammals | 8 | Endangered | 8 | US | V | wherever found |
| Vulpes velox | Swift fox | Fox, swift | A085 | V01 | CA, CO; | Canidae | NA | Mammals | 6 | Not Listed | 6, 8 | US | V | U.S. pop. |
| Vulpes velox hebes | Northern swift fox | Fox, northern swift | A010 | V01 | Canada | Canidae | Jun 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Canada |
| Vulpes vulpes necator | Sierra Nevada red fox | Fox, Sierra Nevada red | A0AY | V01 | CA, OR; | Canidae | NA | Mammals | 8 | Not Listed | 1, 8 | US | V | Wherever found |
| Vulpes vulpes necator | Sierra Nevada red fox | Fox, Sierra Nevada red | A0AY | V02 | Canidae | NA | Mammals | 8 | Candidate | NA | US | V | Sierra Nevada DPS | |
| Vultur gryphus | Andean condor | Condor, Andean | B03Y | V01 | Colombia to Chile and Argentina | Cathartidae | Dec 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Waldsteinia idahoensis | No common name | No common name | Q2M7 | P01 | ID; | Rosaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Waldsteinia lobata | Piedmont barren strawberry | barren strawberry, Piedmont | Q2M8 | P01 | GA, SC; | Rosaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Entire |
| Waltheria pyrolaefolia | No common name | No common name | Q23Y | P01 | HI; | Sterculiaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Waltoncythere acuta | [Unnamed] ostracod | Ostracod, [unnamed] | K047 | I01 | NC; | Entocytheridae | NA | Crustaceans | 4 | Not Listed | 4 | US | I | Wherever found |
| Warea amplexifolia | Wide-leaf warea | Warea, wide-leaf | Q2M9 | P01 | FL; Known to occur in the high pine (or sandhill) habitat on the Lake Wales Ridge in Lake, Orange, Osceola, and Polk Counties in Florida. ; U.S.A. (FL) | Brassicaceae | Apr 29, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Warea carteri | Carter's mustard | Mustard, Carter's | Q2MA | P01 | FL; U.S.A. (FL) | Brassicaceae | Jan 21, 1987 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Warea sessilifolia | Sessile-leaved warea | Warea, sessile-leaved | Q23Z | P01 | AL, FL, GA; | Brassicaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Wikstroemia basicorda | No common name | No common name | Q240 | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia hanalei | No common name | No common name | Q2MB | P01 | HI; Believed to be extinct | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia isae | No common name | No common name | Q2MC | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia leptantha | No common name | No common name | Q241 | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia monticola occidentalis | No common name | No common name | Q242 | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia sandwicensis | No common name | No common name | Q2MD | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Wikstroemia skottsbergiana | No common name | No common name | Q243 | P01 | HI; ; Currently, there is one occurrence on an undisclosed private site on the island of Kauai (Hawaii Plant Extinction Prevention Program 2012, p. 26). | Thymelaeaceae | Oct 31, 2016 | Flowering Plants | 1 | Endangered | 1 | US | P | Entire |
| Wikstroemia villosa | No common name | No common name | Q244 | P01 | HI; | Thymelaeaceae | Jun 27, 2013 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Wilkesia hobdyi | Dwarf iliau | Iliau, dwarf | Q245 | P01 | HI; U.S.A. (HI) | Asteraceae | Jun 22, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Wilkstroemia bicornuta | No common name | No common name | Q3GG | P01 | HI; | Thymelaeaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Williamsonia lintneri | Banded bog skimmer | Skimmer, banded bog | I0DR | I01 | CT, DE, MA, NH, NJ, NY, RI; | Corduliidae | NA | Insects | 5 | Not Listed | 5 | US | I | Wherever found |
| Willkommia texana | No common name | No common name | Q2ME | P01 | TX; | Poaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| wilsonia pusilla | Wilson's warbler | warbler, Wilson's | B0EZ | V01 | fringillidae | NA | Birds | 7 | Not Listed | NA | US | V | Wherever found | |
| Woodsia abbeae | No common name | No common name | S01C | P01 | MI, MN, WI; | Aspleniaceae | NA | Ferns and Allies | 3 | Not Listed | 3 | US | P | Wherever found |
| Woodsia oregana cathcartiana | Oregon woodsia | Woodsia, Oregon | S01D | P01 | MN, NY, WI; | Aspleniaceae | NA | Ferns and Allies | 3 | Not Listed | 3, 5 | US/Foreign | P | Wherever found |
| Wormaldia oconee | [Unnamed] caddisfly | Caddisfly, [unnamed] | I0OU | I01 | SC; | Philoptamidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Wyethia reticulata | El Dorado mule-ears | Mule-ears, El Dorado | Q2MH | P01 | CA; | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US | P | Wherever found |
| Wyulda squamicaudata | Scaly-tailed possum | Possum, scaly-tailed | A03G | V01 | Wherever found | Phalangeridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| xanthoparmelia dissensa | No common name | No common name | U00D | P01 | parmeliaceae | NA | Lichens | 2 | Not Listed | NA | US | P | Wherever found | |
| xanthoparmelia planilobata | No common name | No common name | U00E | P01 | parmeliaceae | NA | Lichens | 2 | Not Listed | NA | US | P | Wherever found | |
| Xantusia bezyi | Bezy's night lizard | Lizard, Bezy's night | C07E | V01 | AZ; | Xantusiidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Xantusia gracilis | Sandstone night lizard | Lizard, sandstone night | C05X | V01 | CA; | Xantusiidae | NA | Reptiles | 8 | Not Listed | 8 | US | V | Wherever found |
| Xantusia henshawi | Granite night lizard | lizard, Granite night | C06V | V01 | Xantusiidae | NA | Reptiles | 2 | Not Listed | NA | US | V | Wherever found | |
| Xantusia riversiana | Island night lizard | Lizard, Island night | C01M | V01 | CA; U.S.A. (CA) | Xantusiidae | Sep 12, 1977 | Reptiles | 8 | Recovery | 8 | US | V | Wherever found |
| Xantusia vigilis arizonae | Arizona night lizard | Lizard, Arizona night | C07D | V01 | AZ; | Xantusiidae | NA | Reptiles | 2 | Not Listed | 2 | US | V | Wherever found |
| Xantusia vigilis sierrae | Sierra night lizard | Lizard, Sierra night | C05Y | V01 | CA; | Xantusiidae | NA | Reptiles | 1 | Not Listed | 8 | US | V | Wherever found |
| Xenicus longipes | New Zealand bushwren | Bushwren, New Zealand | B013 | V01 | New Zealand | Xenicidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Xenopirostris damii | Van Dam's vanga | Vanga, Van Dam's | B0A9 | V01 | Madagascar | Vangidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Xenopirostris polleni | Pollen's vanga | Vanga, Pollen's | B0A8 | V01 | Madagascar | Vangidae | Jan 12, 1995 | Birds | Foreign | Threatened | NA | Foreign | V | Wherever found |
| Xerarionta redimita | Wreathed cactus snail | Snail, wreathed cactus | G03P | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Xerarionta tryoni | Bicolored cactus snail | Snail, bicolored cactus | G00B | I01 | CA; | Helminthoglyptidae | NA | Snails | 1 | Not Listed | 8 | US | I | Wherever found |
| Xeromys myoides | False water rat | Rat, false water | A03H | V01 | Wherever found | Muridae | Dec 02, 1970 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Xipholena atropurpurea | White-winged cotinga | Cotinga, white-winged | B04S | V01 | Brazil | Cotingidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Xylorhiza cognata | Mecca aster | Aster, Mecca | Q3GH | P01 | CA; Mexico (Baja California) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Xylorhiza confertifolia | No common name | No common name | Q2MI | P01 | UT; | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Xylorhiza cronquistii | No common name | No common name | Q2RH | P01 | UT; Possibly extinct | Asteraceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Xylorhiza orcuttii | Borrego aster | Aster, Borrego | Q2MJ | P01 | CA; Mexico (Baja California) | Asteraceae | NA | Flowering Plants | 1 | Not Listed | 8 | US/Foreign | P | Wherever found |
| Xylosma crenatum | No common name | No common name | Q2MK | P01 | HI; U.S.A. (HI) | Salicaceae | May 13, 1992 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Xyrauchen texanus | Razorback sucker | Sucker, razorback | E054 | V01 | AZ, CA, CO, NM, NV, UT; U.S.A. (WY, UT, NV, NM, CO, CA, AZ), Mexico | Catostomidae | Oct 23, 1991 | Fishes | 6 | Endangered | 2, 6, 8 | US/Foreign | V | Wherever found |
| Xyris drummondii | Drummond's yellow-eyed grass | Yellow-eyed grass, Drummond's | Q2ML | P01 | AL, FL, GA, LA, MS, TX; | Xyridaceae | NA | Flowering Plants | 4 | Not Listed | 2, 4 | US | P | Wherever found |
| Xyris isoetifolia | No common name | No common name | Q2MM | P01 | FL; | Xyridaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Xyris longisepala | Karst pond xyris | Xyris, karst pond | Q2MN | P01 | FL; | Xyridaceae | NA | Flowering Plants | 4 | Under Review in the Candidate or Petition Process | 4 | US | P | Wherever found |
| Xyris scabrifolia | No common name | No common name | Q2MO | P01 | FL; | Xyridaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Xyris tennesseensis | Tennessee yellow-eyed grass | Grass, Tennessee yellow-eyed | Q2MP | P01 | AL, GA, TN; U.S.A. (TN, GA, AL) | Xyridaceae | Jul 26, 1991 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Yermo xanthocephalus | Desert yellowhead | Yellowhead, desert | Q3GI | P01 | WY; U.S.A. (WY) | Asteraceae | Mar 14, 2002 | Flowering Plants | 6 | Threatened | 6 | US | P | Wherever found |
| Yucca angustissima toftiae | No common name | No common name | Q2MQ | P01 | UT; | Liliaceae | NA | Flowering Plants | 6 | Not Listed | 6 | US | P | Wherever found |
| Yucca brevifolia | Joshua Tree | Tree, Joshua | Q3SC | P01 | AZ, CA, NV, UT; | Asparagaceae | NA | Flowering Plants | 8 | Under Review in the Candidate or Petition Process | 2, 6, 8 | US | P | Wherever found |
| yucca cernua | No common name | No common name | Q3LL | P01 | agavaceae | NA | Flowering Plants | 2 | Not Listed | NA | US | P | Wherever found | |
| Zaitzevia thermae | Warm Springs Zaitzevian riffle beetle | Beetle, Warm Springs Zaitzevian riffle | I02F | I01 | MT; | Elmidae | NA | Insects | 6 | Not Listed | 6 | US | I | Wherever found |
| Zale perculta | Okefenokee zale moth | Moth, Okefenokee zale | I0LI | I01 | FL, GA; | Noctuidae | NA | Insects | 4 | Not Listed | 4 | US | I | Wherever found |
| Zamia integrifolia pigmaea | Florida coontie | Coontie, Florida | R009 | P01 | FL, GA; | Cycadaceae | NA | Conifers and Cycads | 4 | Not Listed | 4 | US | P | Wherever found |
| Zanthoxylum dipetalum dipetalum | Kawa`u | Kawa`u | Q2MS | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum dipetalum var. tomentosum | A`e | A`e | Q3A7 | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 10, 1996 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Zanthoxylum glandulosum | No common name | No common name | Q2MT | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum hawaiiense | A`e | A`e | Q246 | P01 | HI; Entire | Rutaceae | Mar 04, 1994 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Zanthoxylum kauaense kohuana | No common name | No common name | Q2MU | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum maviense | No common name | No common name | Q2MV | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum oahuense | A`e | A`e | Q3H9 | P01 | HI; U.S.A. (HI) | Rutaceae | Oct 18, 2012 | Flowering Plants | 1 | Endangered | 1 | US | P | Wherever found |
| Zanthoxylum parvum | Shinner's tickle-tongue | Tickle-tongue, Shinner's | Q247 | P01 | TX; | Rutaceae | NA | Flowering Plants | 2 | Not Listed | 2 | US | P | Wherever found |
| Zanthoxylum semiarticulatum | A`e | A`e | Q248 | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum skottsbergii | A`e | A`e | Q2MW | P01 | HI; | Rutaceae | NA | Flowering Plants | 1 | Not Listed | 1 | US | P | Wherever found |
| Zanthoxylum thomasianum | St. Thomas prickly-ash | Prickly-ash, St. Thomas | Q2MX | P01 | PR, VI; Puerto Rico and Virgin Islands; U.S.A. (VI, PR) | Rutaceae | Dec 20, 1985 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Zapada glacier | Western glacier stonefly | Stonefly, western glacier | I0VZ | I01 | MT; U.S.A. (MT) | Nemouridae | NA | Insects | 6 | Proposed Threatened | 6 | US | I | Wherever found |
| Zapada wahkeena | Wahkeena Falls flightless stonefly | Stonefly, Wahkeena Falls flightless | I0EH | I01 | OR; | Nemouridae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Zapus hudsonius luteus | New Mexico meadow jumping mouse | Mouse, New Mexico meadow jumping | A0BX | V01 | AZ, CO, NM; ; The jumping mouse is a small mammal whose historical distribution likely included riparian wetlands along streams in the Sangre de Cristo and San Juan Mountains from southern Colorado to central New Mexico, including the Jemez and Sacramento Mountains and the Rio Grande Valley from Espanola to Bosque del Apache National Wildlife Refuge, and into parts of the White Mountains in eastern Arizona. | Zapodidae | Jul 10, 2014 | Mammals | 2 | Endangered | 2, 6 | US | V | Wherever found |
| Zapus hudsonius preblei | Preble's meadow jumping mouse | Mouse, Preble's meadow jumping | A0C2 | V01 | CO, WY; ; U.S.A. (CO, WY) | Zapodidae | May 13, 1998 | Mammals | 6 | Threatened | 6 | US | V | wherever found |
| Zapus trinotatus orarius | Point Reyes jumping mouse | Mouse, Point Reyes jumping | A0C1 | V01 | CA; | Zapodidae | NA | Mammals | 1 | Not Listed | 8 | US | V | Wherever found |
| Zephyranthes simpsonii | No common name | No common name | Q2MY | P01 | FL, GA, NC, SC; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Zephyranthes treatiae | No common name | No common name | Q3I6 | P01 | FL; | Liliaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Zigadenus vaginatus | Sheathed deathcamus | Deathcamus, sheathed | Q249 | P01 | NV, UT; | Liliaceae | NA | Flowering Plants | 1 | Not Listed | 6, 8 | US | P | Wherever found |
| Zizania texana | Texas wild-rice | Wild-rice, Texas | Q24A | P01 | TX; U.S.A. (TX) | Poaceae | May 27, 1978 | Flowering Plants | 2 | Endangered | 2 | US | P | Wherever found |
| Zizia trifoliata | No common name | No common name | Q2WW | P01 | FL, GA; | Apiaceae | NA | Flowering Plants | 4 | Not Listed | 4 | US | P | Wherever found |
| Ziziphus celata | Florida ziziphus | Ziziphus, Florida | Q2WX | P01 | FL; U.S.A. (FL) | Rhamnaceae | Jul 27, 1989 | Flowering Plants | 4 | Endangered | 4 | US | P | Wherever found |
| Zorotypus swezeyi | Swezey's zoroapteran | Zoroapteran, Swezey's | I0I6 | I01 | HI; | Zorotypidae | NA | Insects | 1 | Not Listed | 1 | US | I | Wherever found |
| Zosterops albogularis | Norfolk Island white-eye | White-eye, Norfolk Island | B05Q | V01 | Indian Ocean-Norfolk Island | Zosteropidae | Jun 14, 1976 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Zosterops conspicillatus conspicillatus | Bridled white-eye | White-eye, bridled | B064 | V01 | GU; Thought to be extirpated from the wild,propagated in captivity; Western Pacific Ocean-U.S.A. (Guam) | Zosteropidae | Aug 27, 1984 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Zosterops luteirostris | Ghizo white-eye | White-eye, Ghizo | B0DC | V01 | Zosteropidae | NA | Birds | Foreign | Under Review in the Candidate or Petition Process | NA | Foreign | V | Wherever found | |
| Zosterops modesta | Seychelles white-eye | White-eye, Seychelles | B03O | V01 | Indian Ocean-Seychelles | Zosteropidae | Jun 02, 1970 | Birds | Foreign | Endangered | NA | Foreign | V | Wherever found |
| Zosterops rotensis | Rota bridled White-eye | White-eye, Rota bridled | B065 | V01 | MP; Western Pacific Ocean-U.S.A. (Commonwealth of the Northern Mariana Islands) | Zosteropidae | Jan 22, 2004 | Birds | 1 | Endangered | 1 | US | V | Wherever found |
| Zyzomys pedunculatus | Australian native mouse | Mouse, Australian native | A05W | V01 | Australia | Muridae | Jun 14, 1976 | Mammals | Foreign | Endangered | NA | Foreign | V | Wherever found |
Showing 1 to 9,612 of 9,612 entries
